VRF Refrigerant Charge Calc

The VRF and multi-split installer's commissioning calculator — combination ratio and additional refrigerant charge in one honest tool. Enter the outdoor unit's capacity (kW or kBtu/h) and its factory charge, add your indoor units, then log every field-installed liquid-line run: length in meters, diameter from 1/4" to 3/4" (6.35–19.05 mm). The app applies the grams-per-meter table per diameter, shows the additional charge in grams and kilograms, the total charge (factory + additional), and the indoor/outdoor combination ratio with a clear verdict against the 50–130% band. CHARGE PROFILES • Generic R-410A g/m table built in • Carrier-style sample profile from a published service manual • Custom profile: type your model's own g/m values per diameter — saved on the device PRO — REQUIRES SEPARATE PURCHASE • Multi-split / VRF: two or more indoor units (free covers a single split) • Brand sample and custom charge profiles • Piping limit checks: total length, farthest equivalent length, outdoor–indoor and indoor–indoor height differences • Save calculations to history • Share clean PDF reports Free forever: single-split additional charge with the generic R-410A profile and plain-text sharing. Built for gloves and sunlight: big keypad, huge results, Outdoor Bright mode. Everything stays on your phone — fully offline, no account, no tracking. Results are planning estimates; always verify with the manufacturer's installation manual. Note: features listed under PRO require a separate purchase — an auto-renewable subscription (monthly or yearly) or a one-time Lifetime unlock. ——— Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://hdappstudio.com/vrfcharge/privacy/