Free PC calculators · Formulas published

Find what is holding your PC back.

Check bottlenecks, PSU wattage and expected FPS in seconds, then read practical guides that show you how to fix it. No sign-up, everything runs in your browser.

Browse all tools Read the guides

Quick bottleneck check

Free
Resolution

Popular tools

The calculators people use most when planning or fixing a PC.

All tools
PC Bottleneck Calculator See if your CPU or GPU limits FPS at your resolution. Power Supply Calculator Get the PSU wattage your build needs, with headroom. FPS Calculator Estimate frame rates in popular games for your GPU. DPI Analyzer eDPI, cm/360 and sensitivity conversion between games. Polling Rate Tester Check whether your keyboard runs at 125, 500 or 1000Hz+. Mouse Speed Test Measure mouse movement speed and estimate polling rate.

Latest guides

Straight answers first, then the detail and the sources.

All guides

How we build our tools

Every calculator is a simple formula you can check by hand. We publish it, list what it cannot tell you, and fix it when readers report a problem.

Read our methodology

Published formulas

Inputs, maths and limits are shown on every tool page.

Sourced guides

Facts checked against manufacturer docs and independent tests.

One accountable editor

Written and maintained by Adnan, founder of TechCalcu. About Adnan