Airsoft Volume & Ratio Calculators<\/title>\n <style>\n body {\n font-family: Arial, sans-serif;\n background: #000000;\n color: #00B630;\n margin: 20px auto;\n padding: 20px;\n border-radius: 12px;\n box-shadow: 0 0 15px rgba(0, 182, 48, 0.5);\n }\nlabel {\n display: block;\n margin: 8px 0 4px;\n color: #00B630; \/* Force label color *\/\n}\nselect {\n background-color: #000000 !important;\n color: #00B630 !important;\n}\ninput[type=\"number\"], input[type=\"text\"] {\n background-color: #000000 !important;\n color: #00B630 !important;\n}\n\n h2 {\n text-align: center;\n margin-bottom: 10px;\n }\n .section {\n margin-bottom: 25px;\n padding: 15px;\n border: 1px solid #00B630;\n border-radius: 10px;\n }\n label {\n display: block;\n margin: 8px 0 4px;\n }\n input, select {\n padding: 6px;\n width: 100%;\n border: 1px solid #00B630;\n border-radius: 6px;\n background: #000;\n color: #00B630;\n }\n button {\n display: block;\n margin: 20px auto;\n padding: 10px 20px;\n border: none;\n border-radius: 8px;\n background: #00B630;\n color: #000;\n font-size: 16px;\n cursor: pointer;\n }\n button:hover {\n background: #00d940;\n }\n #result {\n font-size: 18px;\n font-weight: bold;\n text-align: center;\n margin-top: 20px;\n }\n <\/style>\n<\/head>\n<body>\n\n \n <div class=\"section\">\n <h3>Cylinder Volume Calculator<\/h3>\n\n <label for=\"cd\">Cylinder Diameter (mm):<\/label>\n <select id=\"cd\">\n <option value=\"24\">Standard Cylinder = 24.0mm<\/option>\n <option value=\"24.7\">Bore Up = 24.7mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"cd_custom\" placeholder=\"Custom diameter (mm)\" style=\"display:none;\">\n\n <label for=\"cl\">Cylinder Length (mm):<\/label>\n <select id=\"cl\">\n <option value=\"72\">Standard Cylinder Length = 72mm<\/option>\n <option value=\"68.4\">95% = 68.40mm<\/option>\n <option value=\"64.8\">90% = 64.80mm<\/option>\n <option value=\"61.2\">85% = 61.20mm<\/option>\n <option value=\"57.6\">80% = 57.60mm<\/option>\n <option value=\"54\">75% = 54.00mm<\/option>\n <option value=\"50.4\">70% = 50.40mm<\/option>\n <option value=\"46.8\">65% = 46.80mm<\/option>\n <option value=\"43.2\">60% = 43.20mm<\/option>\n <option value=\"39.6\">55% = 39.60mm<\/option>\n <option value=\"36\">50% = 36.00mm<\/option>\n <option value=\"32.4\">45% = 32.40mm<\/option>\n <option value=\"28.8\">40% = 28.80mm<\/option>\n <option value=\"25.2\">35% = 25.20mm<\/option>\n <option value=\"21.6\">30% = 21.60mm<\/option>\n <option value=\"18\">25% = 18.00mm<\/option>\n <option value=\"82\">SR25\/R85\/PSG-1(V2.5) = 82mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"cl_custom\" placeholder=\"Custom length (mm)\" style=\"display:none;\">\n\n <label for=\"h\">Cylinder Head + Sorbo (mm):<\/label>\n <select id=\"h\">\n <option value=\"7.2\">Standard = 7.20mm<\/option>\n <option value=\"8.7\">AOE = 8.70mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"h_custom\" placeholder=\"Custom value (mm)\" style=\"display:none;\">\n\n <label for=\"p\">Piston Head + AOE (mm):<\/label>\n <select id=\"p\">\n <option value=\"7.7\">Standard = 7.70mm<\/option>\n <option value=\"8.7\">AOE = 8.70mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"p_custom\" placeholder=\"Custom value (mm)\" style=\"display:none;\">\n\n <button onclick=\"calculateCylinderVolume()\">Calculate Cylinder Volume<\/button>\n <div id=\"cvResult\"><\/div>\n <\/div>\n\n \n <div class=\"section\">\n <h3>Barrel Volume Calculator<\/h3>\n\n <label for=\"bd\">Barrel Diameter (mm):<\/label>\n <select id=\"bd\">\n <option value=\"6.00\">6.00mm<\/option>\n <option value=\"6.01\">6.01mm<\/option>\n <option value=\"6.02\">6.02mm<\/option>\n <option value=\"6.03\">6.03mm<\/option>\n <option value=\"6.05\">6.05mm<\/option>\n <option value=\"6.23\">6.23mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"bd_custom\" placeholder=\"Custom diameter (mm)\" style=\"display:none;\">\n\n <label for=\"bl\">Barrel Length (mm):<\/label>\n <select id=\"bl\">\n <option value=\"100\">100mm<\/option>\n <option value=\"140\">140mm<\/option>\n <option value=\"150\">150mm<\/option>\n <option value=\"200\">200mm<\/option>\n <option value=\"210\">210mm<\/option>\n <option value=\"230\">230mm<\/option>\n <option value=\"250\">250mm<\/option>\n <option value=\"260\">260mm<\/option>\n <option value=\"270\">270mm<\/option>\n <option value=\"280\">280mm<\/option>\n <option value=\"290\">290mm<\/option>\n <option value=\"310\">310mm<\/option>\n <option value=\"320\">320mm<\/option>\n <option value=\"350\">350mm<\/option>\n <option value=\"370\">370mm<\/option>\n <option value=\"410\">410mm<\/option>\n <option value=\"430\">430mm<\/option>\n <option value=\"455\">455mm<\/option>\n <option value=\"510\">510mm<\/option>\n <option value=\"590\">590mm<\/option>\n <option value=\"650\">650mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"bl_custom\" placeholder=\"Custom length (mm)\" style=\"display:none;\">\n\n <button onclick=\"calculateBarrelVolume()\">Calculate Barrel Volume<\/button>\n <div id=\"bvResult\"><\/div>\n <\/div>\n\n\n\n \n <div class=\"section\">\n <h3>CV \/ BV Ratio Calculator<\/h3>\n <label for=\"cv\">Cylinder Volume (mm\u00b3):<\/label>\n <input type=\"number\" id=\"cv\">\n\n <label for=\"bv\">Barrel Volume (mm\u00b3):<\/label>\n <input type=\"number\" id=\"bv\">\n\n <button onclick=\"calculateRatio()\">Calculate Ratio<\/button>\n <div id=\"ratioResult\"><\/div>\n <\/div>\n\n\n <div class=\"section\">\n <h3>Best BB Weight Calculator<\/h3>\n <label for=\"bbw_ratio\">CV \/ BV Ratio:<\/label>\n <input type=\"number\" id=\"bbw_ratio\">\n\n <button onclick=\"calculateBestBB()\">Calculate Best BB Weight<\/button>\n <div id=\"bbwResult\"><\/div>\n <\/div>\n\n\n \n <div class=\"section\">\n <h3>Barrel Length Calculator<\/h3>\n <label for=\"blc_cv\">Cylinder Volume (mm\u00b3):<\/label>\n <input type=\"number\" id=\"blc_cv\">\n\n <label for=\"blc_d\">Barrel Diameter (mm):<\/label>\n <select id=\"blc_d\">\n <option value=\"6.00\">6.00mm<\/option>\n <option value=\"6.01\">6.01mm<\/option>\n <option value=\"6.02\">6.02mm<\/option>\n <option value=\"6.03\">6.03mm<\/option>\n <option value=\"6.05\">6.05mm<\/option>\n <option value=\"6.23\">6.23mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"blc_d_custom\" placeholder=\"Custom diameter (mm)\" style=\"display:none;\">\n\n <label for=\"blc_w\">BB Weight (g):<\/label>\n <select id=\"blc_w\">\n <option value=\"0.20\">0.20g<\/option>\n <option value=\"0.23\">0.23g<\/option>\n <option value=\"0.25\">0.25g<\/option>\n <option value=\"0.28\">0.28g<\/option>\n <option value=\"0.30\">0.30g<\/option>\n <option value=\"0.32\">0.32g<\/option>\n <option value=\"0.36\">0.36g<\/option>\n <option value=\"0.40\">0.40g<\/option>\n <option value=\"0.43\">0.43g<\/option>\n <option value=\"0.45\">0.45g<\/option>\n <option value=\"0.48\">0.48g<\/option>\n <option value=\"0.50\">0.50g<\/option>\n <option value=\"0.58\">0.58g<\/option>\n <option value=\"0.62\">0.62g<\/option>\n <option value=\"0.68\">0.68g<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"blc_w_custom\" placeholder=\"Custom Weight (g)\" style=\"display:none;\">\n\n <button onclick=\"calculateBarrelLength()\">Calculate Barrel Length<\/button>\n <div id=\"blcResult\"><\/div>\n <\/div>\n\n <script>\n \/\/ Show custom input fields for all dropdowns\n ['cd','cl','h','p','bd','bl','blc_w','blc_d'].forEach(id => {\n document.getElementById(id).addEventListener('change', function(){\n const customInput = document.getElementById(id+'_custom');\n if(this.value === 'custom') customInput.style.display = 'block';\n else customInput.style.display = 'none';\n });\n });\n\n function getValue(id){\n const select = document.getElementById(id);\n if(select.value === 'custom'){\n return parseFloat(document.getElementById(id+'_custom').value);\n }\n return parseFloat(select.value);\n }\n\n \/\/ Cylinder Volume\n function calculateCylinderVolume() {\n const D = getValue('cd');\n const L = getValue('cl');\n const H = getValue('h');\n const P = getValue('p');\n const A = L - H - P;\n const R = D\/2;\n const CV = Math.PI * R * R * A;\n document.getElementById(\"cvResult\").innerHTML = `Cylinder Volume = ${CV.toFixed(2)} mm\u00b3`;\n\n document.getElementById(\"cv\").value = CV.toFixed(2);\n document.getElementById(\"blc_cv\").value = CV.toFixed(2);\n }\n\n \/\/ Barrel Volume\n function calculateBarrelVolume() {\n const D = getValue('bd');\n const L = getValue('bl');\n const R = D\/2;\n const A = L-D;\n const BV = Math.PI * R * R * A;\n document.getElementById(\"bvResult\").innerHTML = `Barrel Volume = ${BV.toFixed(2)} mm\u00b3`;\n\n document.getElementById(\"bv\").value = BV.toFixed(2);\n\n const CV = parseFloat(document.getElementById(\"cv\").value);\n if(CV){\n const ratio = CV \/ BV;\n document.getElementById(\"bbw_ratio\").value = ratio.toFixed(2);\n }\n }\n\n \/\/ Ratio\n function calculateRatio() {\n const CV = parseFloat(document.getElementById(\"cv\").value);\n const BV = parseFloat(document.getElementById(\"bv\").value);\n if(!CV || !BV){ document.getElementById(\"ratioResult\").innerHTML = \"\u26a0\ufe0f Please enter valid CV and BV values.\"; return;}\n const ratio = CV\/BV;\n document.getElementById(\"ratioResult\").innerHTML = `Ratio (CV \/ BV): <strong>${ratio.toFixed(2)}<\/strong>`;\n document.getElementById(\"bbw_ratio\").value = ratio.toFixed(2);\n }\n\n \/\/ Barrel Length\n function calculateBarrelLength(){\n const CV = parseFloat(document.getElementById(\"blc_cv\").value);\n let D = parseFloat(document.getElementById(\"blc_d\").value);\n if(document.getElementById(\"blc_d\").value===\"custom\") D = parseFloat(document.getElementById(\"blc_d_custom\").value);\n let W = parseFloat(document.getElementById(\"blc_w\").value);\n if(document.getElementById(\"blc_w\").value===\"custom\") W = parseFloat(document.getElementById(\"blc_w_custom\").value);\n if(!CV || !D || !W){ document.getElementById(\"blcResult\").innerHTML = \"\u26a0\ufe0f Please fill all fields.\"; return;}\n const R = D\/2;\n const X = CV\/((7.5*(W*W)+1.55)*(Math.PI*R*R));\n document.getElementById(\"blcResult\").innerHTML = `Optimal Barrel Length = ${X.toFixed(2)} mm`;\n }\n\n \/\/ Best BB Weight\n function calculateBestBB(){\n const ratio = parseFloat(document.getElementById(\"bbw_ratio\").value);\n if(!ratio){ document.getElementById(\"bbwResult\").innerHTML = \"\u26a0\ufe0f Please enter a valid Ratio.\"; return;}\n let best = null;\n const weights = [0.20,0.23,0.25,0.28,0.30,0.32,0.36,0.40,0.43,0.45,0.48,0.50,0.58,0.62,0.68];\n weights.forEach(W=>{\n const check = (7.5*(W*W))+1.55;\n if(!best || Math.abs(check-ratio)<Math.abs(((7.5*(best*best))+1.55)-ratio)) best = W;\n });\n document.getElementById(\"bbwResult\").innerHTML = `Best BB Weight \u2248 <strong>${best.toFixed(2)}g<\/strong>`;\n }\n <\/script>\n<\/body>\n<\/html>\n\n\n\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Standard TM Spec VSR10 Cylinder Volume: 35864 mm Airsoft Volume & Ratio Calculators Cylinder Volume Calculator Cylinder Diameter (mm): […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-413","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/airsoftformula.com\/index.php?rest_route=\/wp\/v2\/pages\/413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/airsoftformula.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/airsoftformula.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/airsoftformula.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/airsoftformula.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=413"}],"version-history":[{"count":19,"href":"https:\/\/airsoftformula.com\/index.php?rest_route=\/wp\/v2\/pages\/413\/revisions"}],"predecessor-version":[{"id":435,"href":"https:\/\/airsoftformula.com\/index.php?rest_route=\/wp\/v2\/pages\/413\/revisions\/435"}],"wp:attachment":[{"href":"https:\/\/airsoftformula.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":413,"date":"2025-08-25T16:49:48","date_gmt":"2025-08-25T16:49:48","guid":{"rendered":"https:\/\/airsoftformula.com\/?page_id=413"},"modified":"2025-08-25T18:19:25","modified_gmt":"2025-08-25T18:19:25","slug":"airvolume-calculator","status":"publish","type":"page","link":"https:\/\/airsoftformula.com\/?page_id=413","title":{"rendered":"Air Volume Calculator"},"content":{"rendered":"\n

The Standard TM Spec VSR10 Cylinder Volume: 35864 mm<\/p>\n\n\n\n\n\n\n \n Airsoft Volume & Ratio Calculators<\/title>\n <style>\n body {\n font-family: Arial, sans-serif;\n background: #000000;\n color: #00B630;\n margin: 20px auto;\n padding: 20px;\n border-radius: 12px;\n box-shadow: 0 0 15px rgba(0, 182, 48, 0.5);\n }\nlabel {\n display: block;\n margin: 8px 0 4px;\n color: #00B630; \/* Force label color *\/\n}\nselect {\n background-color: #000000 !important;\n color: #00B630 !important;\n}\ninput[type=\"number\"], input[type=\"text\"] {\n background-color: #000000 !important;\n color: #00B630 !important;\n}\n\n h2 {\n text-align: center;\n margin-bottom: 10px;\n }\n .section {\n margin-bottom: 25px;\n padding: 15px;\n border: 1px solid #00B630;\n border-radius: 10px;\n }\n label {\n display: block;\n margin: 8px 0 4px;\n }\n input, select {\n padding: 6px;\n width: 100%;\n border: 1px solid #00B630;\n border-radius: 6px;\n background: #000;\n color: #00B630;\n }\n button {\n display: block;\n margin: 20px auto;\n padding: 10px 20px;\n border: none;\n border-radius: 8px;\n background: #00B630;\n color: #000;\n font-size: 16px;\n cursor: pointer;\n }\n button:hover {\n background: #00d940;\n }\n #result {\n font-size: 18px;\n font-weight: bold;\n text-align: center;\n margin-top: 20px;\n }\n <\/style>\n<\/head>\n<body>\n\n \n <div class=\"section\">\n <h3>Cylinder Volume Calculator<\/h3>\n\n <label for=\"cd\">Cylinder Diameter (mm):<\/label>\n <select id=\"cd\">\n <option value=\"24\">Standard Cylinder = 24.0mm<\/option>\n <option value=\"24.7\">Bore Up = 24.7mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"cd_custom\" placeholder=\"Custom diameter (mm)\" style=\"display:none;\">\n\n <label for=\"cl\">Cylinder Length (mm):<\/label>\n <select id=\"cl\">\n <option value=\"72\">Standard Cylinder Length = 72mm<\/option>\n <option value=\"68.4\">95% = 68.40mm<\/option>\n <option value=\"64.8\">90% = 64.80mm<\/option>\n <option value=\"61.2\">85% = 61.20mm<\/option>\n <option value=\"57.6\">80% = 57.60mm<\/option>\n <option value=\"54\">75% = 54.00mm<\/option>\n <option value=\"50.4\">70% = 50.40mm<\/option>\n <option value=\"46.8\">65% = 46.80mm<\/option>\n <option value=\"43.2\">60% = 43.20mm<\/option>\n <option value=\"39.6\">55% = 39.60mm<\/option>\n <option value=\"36\">50% = 36.00mm<\/option>\n <option value=\"32.4\">45% = 32.40mm<\/option>\n <option value=\"28.8\">40% = 28.80mm<\/option>\n <option value=\"25.2\">35% = 25.20mm<\/option>\n <option value=\"21.6\">30% = 21.60mm<\/option>\n <option value=\"18\">25% = 18.00mm<\/option>\n <option value=\"82\">SR25\/R85\/PSG-1(V2.5) = 82mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"cl_custom\" placeholder=\"Custom length (mm)\" style=\"display:none;\">\n\n <label for=\"h\">Cylinder Head + Sorbo (mm):<\/label>\n <select id=\"h\">\n <option value=\"7.2\">Standard = 7.20mm<\/option>\n <option value=\"8.7\">AOE = 8.70mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"h_custom\" placeholder=\"Custom value (mm)\" style=\"display:none;\">\n\n <label for=\"p\">Piston Head + AOE (mm):<\/label>\n <select id=\"p\">\n <option value=\"7.7\">Standard = 7.70mm<\/option>\n <option value=\"8.7\">AOE = 8.70mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"p_custom\" placeholder=\"Custom value (mm)\" style=\"display:none;\">\n\n <button onclick=\"calculateCylinderVolume()\">Calculate Cylinder Volume<\/button>\n <div id=\"cvResult\"><\/div>\n <\/div>\n\n \n <div class=\"section\">\n <h3>Barrel Volume Calculator<\/h3>\n\n <label for=\"bd\">Barrel Diameter (mm):<\/label>\n <select id=\"bd\">\n <option value=\"6.00\">6.00mm<\/option>\n <option value=\"6.01\">6.01mm<\/option>\n <option value=\"6.02\">6.02mm<\/option>\n <option value=\"6.03\">6.03mm<\/option>\n <option value=\"6.05\">6.05mm<\/option>\n <option value=\"6.23\">6.23mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"bd_custom\" placeholder=\"Custom diameter (mm)\" style=\"display:none;\">\n\n <label for=\"bl\">Barrel Length (mm):<\/label>\n <select id=\"bl\">\n <option value=\"100\">100mm<\/option>\n <option value=\"140\">140mm<\/option>\n <option value=\"150\">150mm<\/option>\n <option value=\"200\">200mm<\/option>\n <option value=\"210\">210mm<\/option>\n <option value=\"230\">230mm<\/option>\n <option value=\"250\">250mm<\/option>\n <option value=\"260\">260mm<\/option>\n <option value=\"270\">270mm<\/option>\n <option value=\"280\">280mm<\/option>\n <option value=\"290\">290mm<\/option>\n <option value=\"310\">310mm<\/option>\n <option value=\"320\">320mm<\/option>\n <option value=\"350\">350mm<\/option>\n <option value=\"370\">370mm<\/option>\n <option value=\"410\">410mm<\/option>\n <option value=\"430\">430mm<\/option>\n <option value=\"455\">455mm<\/option>\n <option value=\"510\">510mm<\/option>\n <option value=\"590\">590mm<\/option>\n <option value=\"650\">650mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"bl_custom\" placeholder=\"Custom length (mm)\" style=\"display:none;\">\n\n <button onclick=\"calculateBarrelVolume()\">Calculate Barrel Volume<\/button>\n <div id=\"bvResult\"><\/div>\n <\/div>\n\n\n\n \n <div class=\"section\">\n <h3>CV \/ BV Ratio Calculator<\/h3>\n <label for=\"cv\">Cylinder Volume (mm\u00b3):<\/label>\n <input type=\"number\" id=\"cv\">\n\n <label for=\"bv\">Barrel Volume (mm\u00b3):<\/label>\n <input type=\"number\" id=\"bv\">\n\n <button onclick=\"calculateRatio()\">Calculate Ratio<\/button>\n <div id=\"ratioResult\"><\/div>\n <\/div>\n\n\n <div class=\"section\">\n <h3>Best BB Weight Calculator<\/h3>\n <label for=\"bbw_ratio\">CV \/ BV Ratio:<\/label>\n <input type=\"number\" id=\"bbw_ratio\">\n\n <button onclick=\"calculateBestBB()\">Calculate Best BB Weight<\/button>\n <div id=\"bbwResult\"><\/div>\n <\/div>\n\n\n \n <div class=\"section\">\n <h3>Barrel Length Calculator<\/h3>\n <label for=\"blc_cv\">Cylinder Volume (mm\u00b3):<\/label>\n <input type=\"number\" id=\"blc_cv\">\n\n <label for=\"blc_d\">Barrel Diameter (mm):<\/label>\n <select id=\"blc_d\">\n <option value=\"6.00\">6.00mm<\/option>\n <option value=\"6.01\">6.01mm<\/option>\n <option value=\"6.02\">6.02mm<\/option>\n <option value=\"6.03\">6.03mm<\/option>\n <option value=\"6.05\">6.05mm<\/option>\n <option value=\"6.23\">6.23mm<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"blc_d_custom\" placeholder=\"Custom diameter (mm)\" style=\"display:none;\">\n\n <label for=\"blc_w\">BB Weight (g):<\/label>\n <select id=\"blc_w\">\n <option value=\"0.20\">0.20g<\/option>\n <option value=\"0.23\">0.23g<\/option>\n <option value=\"0.25\">0.25g<\/option>\n <option value=\"0.28\">0.28g<\/option>\n <option value=\"0.30\">0.30g<\/option>\n <option value=\"0.32\">0.32g<\/option>\n <option value=\"0.36\">0.36g<\/option>\n <option value=\"0.40\">0.40g<\/option>\n <option value=\"0.43\">0.43g<\/option>\n <option value=\"0.45\">0.45g<\/option>\n <option value=\"0.48\">0.48g<\/option>\n <option value=\"0.50\">0.50g<\/option>\n <option value=\"0.58\">0.58g<\/option>\n <option value=\"0.62\">0.62g<\/option>\n <option value=\"0.68\">0.68g<\/option>\n <option value=\"custom\">Custom<\/option>\n <\/select>\n <input type=\"number\" id=\"blc_w_custom\" placeholder=\"Custom Weight (g)\" style=\"display:none;\">\n\n <button onclick=\"calculateBarrelLength()\">Calculate Barrel Length<\/button>\n <div id=\"blcResult\"><\/div>\n <\/div>\n\n <script>\n \/\/ Show custom input fields for all dropdowns\n ['cd','cl','h','p','bd','bl','blc_w','blc_d'].forEach(id => {\n document.getElementById(id).addEventListener('change', function(){\n const customInput = document.getElementById(id+'_custom');\n if(this.value === 'custom') customInput.style.display = 'block';\n else customInput.style.display = 'none';\n });\n });\n\n function getValue(id){\n const select = document.getElementById(id);\n if(select.value === 'custom'){\n return parseFloat(document.getElementById(id+'_custom').value);\n }\n return parseFloat(select.value);\n }\n\n \/\/ Cylinder Volume\n function calculateCylinderVolume() {\n const D = getValue('cd');\n const L = getValue('cl');\n const H = getValue('h');\n const P = getValue('p');\n const A = L - H - P;\n const R = D\/2;\n const CV = Math.PI * R * R * A;\n document.getElementById(\"cvResult\").innerHTML = `Cylinder Volume = ${CV.toFixed(2)} mm\u00b3`;\n\n document.getElementById(\"cv\").value = CV.toFixed(2);\n document.getElementById(\"blc_cv\").value = CV.toFixed(2);\n }\n\n \/\/ Barrel Volume\n function calculateBarrelVolume() {\n const D = getValue('bd');\n const L = getValue('bl');\n const R = D\/2;\n const A = L-D;\n const BV = Math.PI * R * R * A;\n document.getElementById(\"bvResult\").innerHTML = `Barrel Volume = ${BV.toFixed(2)} mm\u00b3`;\n\n document.getElementById(\"bv\").value = BV.toFixed(2);\n\n const CV = parseFloat(document.getElementById(\"cv\").value);\n if(CV){\n const ratio = CV \/ BV;\n document.getElementById(\"bbw_ratio\").value = ratio.toFixed(2);\n }\n }\n\n \/\/ Ratio\n function calculateRatio() {\n const CV = parseFloat(document.getElementById(\"cv\").value);\n const BV = parseFloat(document.getElementById(\"bv\").value);\n if(!CV || !BV){ document.getElementById(\"ratioResult\").innerHTML = \"\u26a0\ufe0f Please enter valid CV and BV values.\"; return;}\n const ratio = CV\/BV;\n document.getElementById(\"ratioResult\").innerHTML = `Ratio (CV \/ BV): <strong>${ratio.toFixed(2)}<\/strong>`;\n document.getElementById(\"bbw_ratio\").value = ratio.toFixed(2);\n }\n\n \/\/ Barrel Length\n function calculateBarrelLength(){\n const CV = parseFloat(document.getElementById(\"blc_cv\").value);\n let D = parseFloat(document.getElementById(\"blc_d\").value);\n if(document.getElementById(\"blc_d\").value===\"custom\") D = parseFloat(document.getElementById(\"blc_d_custom\").value);\n let W = parseFloat(document.getElementById(\"blc_w\").value);\n if(document.getElementById(\"blc_w\").value===\"custom\") W = parseFloat(document.getElementById(\"blc_w_custom\").value);\n if(!CV || !D || !W){ document.getElementById(\"blcResult\").innerHTML = \"\u26a0\ufe0f Please fill all fields.\"; return;}\n const R = D\/2;\n const X = CV\/((7.5*(W*W)+1.55)*(Math.PI*R*R));\n document.getElementById(\"blcResult\").innerHTML = `Optimal Barrel Length = ${X.toFixed(2)} mm`;\n }\n\n \/\/ Best BB Weight\n function calculateBestBB(){\n const ratio = parseFloat(document.getElementById(\"bbw_ratio\").value);\n if(!ratio){ document.getElementById(\"bbwResult\").innerHTML = \"\u26a0\ufe0f Please enter a valid Ratio.\"; return;}\n let best = null;\n const weights = [0.20,0.23,0.25,0.28,0.30,0.32,0.36,0.40,0.43,0.45,0.48,0.50,0.58,0.62,0.68];\n weights.forEach(W=>{\n const check = (7.5*(W*W))+1.55;\n if(!best || Math.abs(check-ratio)<Math.abs(((7.5*(best*best))+1.55)-ratio)) best = W;\n });\n document.getElementById(\"bbwResult\").innerHTML = `Best BB Weight \u2248 <strong>${best.toFixed(2)}g<\/strong>`;\n }\n <\/script>\n<\/body>\n<\/html>\n\n\n\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Standard TM Spec VSR10 Cylinder Volume: 35864 mm Airsoft Volume & Ratio Calculators Cylinder Volume Calculator Cylinder Diameter (mm): 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