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A calculator provides an initial engineering target, but the final cooling solution also depends on geometry, available space, heat source distribution, airflow or coolant conditions, mounting and manufacturing requirements.

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Home Airflow Calculator for Electronics Cooling

Step 1 — Choose what to calculate

Electronics Cooling Airflow Calculator

Enter heat load and allowable air temperature rise to calculate theoretical and recommended design airflow.

Heat Load Required

Total heat released into the cooling air, not the equipment input rating.

Air Temperature Rise Required

The expected outlet-air temperature minus inlet-air temperature.

Available Airflow Required

Use airflow at the actual fan operating point, after system resistance.

Inlet Air Temperature Required

Used with altitude to estimate actual air density.

Advanced assumptions

Installation Altitude

Higher altitude reduces air density and increases required volume flow.

Design Safety Factor

Applied to theoretical airflow. Default: 1.5× for preliminary fan sizing.

Air Density

Air Specific Heat

Calculation Results

Preliminary engineering estimate

Calculated

Recommended Design Airflow

267 CFM

453 m³/h

Theoretical Airflow

178 CFM

Mass Flow

0.149 kg/s

Estimated Outlet Air

35.0 °C

Calculated Air Density

1.184 kg/m³

Airflow design margin 1.50×

Theoretical

178

Design

267

Fan selection still requires pressure data

CFM alone does not define a fan. Verify heat sink and duct pressure drop against the fan curve at the real operating point.

This calculator is for preliminary estimation only. It does not replace thermal simulation, fan-curve verification, prototype testing, or a full system thermal review.