Electronics calculator
What Radiator Size Fits My PC Case?
Find minimum radiator section count from cpu heat load watts, gpu heat load watts, and radiator rated dissipation per 120mm section.
Enter your measurements
What Radiator Size Fits My PC Case? Measure cpu heat load watts, gpu heat load watts, and radiator rated dissipation per 120mm section first. This tool converts them into minimum radiator section count so the recommendation stays tied to your actual dimensions or specification.
- CPU heat load watts — Required
- GPU heat load watts — Optional
- Radiator rated dissipation per 120mm section — Required
- Cooling headroom — Required
Minimum radiator section count
Enter the measurements above to calculate minimum radiator section count.
How the calculation works
V16 calculation: sections=ceil((cpuHeatWatts+gpuHeatWatts)×(1+headroom)/ratedWattsPerSection); radiatorLength=sections×0.12. Canonical CMS units are used for numeric constants.
Worked example
Example: CPU heat load watts = 125 W; GPU heat load watts = 300 W; Radiator rated dissipation per 120mm section = 150 W; Cooling headroom = 20%. Result: Sections = 4; Radiator Length = 48 cm.
Before you decide
Use the finished, usable dimensions after trim, handles, skirting, packaging or other projections where relevant. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what radiator size fits my pc case, the limiting result on this page is minimum radiator section count.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Radiator Size Fits My PC Case calculator tell me?
It returns minimum radiator section count from the measurements entered on this page. The calculation is specific to radiator size fits my pc case, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for radiator size fits my pc case?
Measure cpu heat load watts, gpu heat load watts, radiator rated dissipation per 120mm section, cooling headroom. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the minimum radiator section count?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned minimum radiator section count while allowing for the clearances, tolerances or ratings shown by its manufacturer.