Electronics calculator
What PC Case Size Do I Need?
Calculate pc case compatibility using motherboard width, motherboard height, and gpu length.
Enter your measurements
Before choosing a product, measure motherboard width, motherboard height, and gpu length. The what pc case size do i need tool uses those values to calculate pc case compatibility and makes the limiting measurement clear.
- Motherboard width — Required
- Motherboard height — Required
- GPU length — Required
- CPU cooler height — Required
- Case GPU clearance — Required
- Case cooler clearance — Required
- Case board clearance width — Required
- Case board clearance height — Required
PC case compatibility
Enter the measurements above to calculate pc case compatibility.
How the calculation works
This calculator applies motherboardFits=motherboardWidth≤caseBoardMaxWidth AND motherboardHeight≤caseBoardMaxHeight; gpuFits=gpuLength≤caseGpuMax; coolerFits=coolerHeight≤caseCoolerMax; pass only if all three checks pass. The resulting value or pass/fail state is reported as pc case compatibility.
Worked example
Example: Motherboard width = 24.4 cm; Motherboard height = 30.5 cm; GPU length = 32 cm; CPU cooler height = 16 cm; Case GPU clearance = 36 cm; Case cooler clearance = 18 cm; Case board clearance width = 28 cm; Case board clearance height = 33 cm. Result: Cooler Fits = Pass; Gpu Fits = Pass; Motherboard Fits = Pass.
Before you decide
Use measured dimensions rather than nominal labels. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what pc case size do i need, the limiting result on this page is pc case compatibility.
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 PC Case Size calculator tell me?
It returns pc case compatibility from the measurements entered on this page. The calculation is specific to pc case size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for pc case size?
Measure motherboard width, motherboard height, gpu length, cpu cooler height, case gpu clearance, case cooler clearance, case board clearance width, case board clearance height. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the pc case compatibility?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned pc case compatibility while allowing for the clearances, tolerances or ratings shown by its manufacturer.