FieldCalc

FieldCalc is the only calculator an HVAC/R technician needs on a service call. Every daily calculation in one fast, modern, fully offline app — no subscription, no clutter.

CALCULATIONS
- PT Chart — saturation pressure and temperature for R-410A, R-32, R-22, R-134a, and R-407C, with instant analog gauge readout
- Superheat — suction line superheat with flooding warnings
- Subcooling — liquid line subcooling with flash gas warnings
- Duct Sizer — equal-friction round and rectangular duct sizing (ACCA Manual D / ASHRAE), with velocity limit warnings
- Delta-T / Sensible Load — sensible BTU/hr and required airflow, with tonnage and metric conversions

WHY FIELDCALC
- Works 100% offline — no signal needed on the roof or in the basement
- Imperial and metric units on every screen
- Modern, high-contrast interface built for the field
- Fast — open, calculate, done
- No account, no subscription

Built on trusted engineering sources: CoolProp thermodynamic data, ACCA Manual D, and ASHRAE Fundamentals.

FieldCalc is a reference tool for qualified HVAC/R professionals. Always verify results against equipment manufacturer specifications and applicable codes.