Damper Actuator Torque Calculator
Enter the damper size, blade arrangement, seal type and design differential pressure to get the required actuator torque in Nm and in-lb — plus the next standard actuator rating to select.
Open calculator →Home / Engineering Tools
Free HVAC Engineering Calculators
Five sizing tools our sales engineers use every day — actuator torque, control valve Cv / Kv, hydronic flow & ΔT, analog signal scaling and sensor range selection. No sign-up, nothing stored.
Electric Valve Cv / Kv Calculator
Work out the flow coefficient a control valve needs, or start from the coil heat load and water ΔT. Returns required Cv and Kv, the nearest standard valve size and the pressure drop you will actually get.
Open calculator →Fan Coil Flow & ΔT Calculator
Convert between coil heat load, water flow rate and supply / return temperature difference for fan coil units, chilled beams and AHU coils — in kW, RT, BTU/h, m³/h, L/s and GPM.
Open calculator →Analog Signal Scaling Calculator
Convert a 4–20 mA, 0–10 V or 2–10 V signal into the temperature, pressure or humidity it represents — and back again. Includes live-zero and broken-wire checks plus the loop resistor reading.
Open calculator →Sensor Range & Output Selector
Choose the application and the band you need to measure, and get a standard range, the right sensor element, the output signal to specify and where to mount it — for temperature, differential pressure, humidity and CO₂.
Open selector →How to use these tools
Each calculator recalculates as you type, so you can see immediately how a wider damper, a lower pressure class or a smaller ΔT changes the result. Everything happens in your browser — no data is submitted or stored.
They are preliminary sizing aids. The damper, valve or coil manufacturer's own published data always governs the final selection; our engineering team is happy to check a selection against the actual duty. See the method notes on each page for the formulas and assumptions used.
Need Help With a Selection?
Send us the schedule or the drawing — we will come back with a sized actuator or valve and the part number.