Field-first HVAC calculators
Fast inputs, clear units, copyable summaries, and honest assumptions. Use tools anonymously, then sign in later if/when you want saving and history.
Compute actual superheat/subcooling with unit clarity, PT lookup support, and OEM-first guidance.
Field-friendly airflow estimates with clear inputs, units, and interpretation guidance.
Round duct sizing recommendations with velocity/friction guidance and honest assumptions.
Estimate additional charge from line set length/diameter with clear labels and safety disclaimers.
A quick, simplified load estimate for rough field sizing (not a full Manual J).
Safety-forward electrical helpers (Ohm’s law, capacitor checks, voltage drop) with clear interpretation.
Save your work
Calculator use is available without an account. Sign in when you’re ready to save history and re-run past results.
How to use these tools
Clear inputs, consistent units, and practical notes to avoid common measurement mistakes.
- Use the correct unit toggles (°F/°C, psig/kPa).
- Validate your measurement setup before making adjustments.
- Copy results for job notes without storing sensitive customer data.