Fast. Practical. Built for the trades.
Simple calculators for HVAC, plumbing, and the trades.
TradeCalc helps techs, estimators, and contractors make quick calculations without digging through notes, spreadsheets, or old formula sheets.
Quick Reference:
Built for the field
Quick tools for real work โ in the office, on-site, or in the truck.
Clear formulas
See the math behind every result, not just the answer.
No login, no fluff
Open a calculator, plug in your numbers, get your answer. That's it.
Calculators
Core HVAC calculators available now, with more being added regularly.
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Airflow
BTU to CFM
Convert BTU/hr to required airflow using the sensible heat formula.
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Ductwork
Duct Area
Calculate rectangular duct area in square feet using duct width and height in inches.
Open calculator โ -
Load & Heat
Heat Loss (Simplified)
Estimate required heating output using floor area and a heat loss factor.
Open calculator โ
New calculators added regularly.
Get notified when new tools launch - no spam, just updates.