Picking a power supply, a monitor and your in-game settings all come down to a few numbers. These free calculators cover the questions we get most often from builders: how many watts you really need, whether a 27-inch 1440p monitor is sharp enough, and what your frame rate means in milliseconds. Every page lists the formulas and spec sources so you can check the results.
PSU Wattage CalculatorPeak system watts and the right PSU size for RTX 50 / RX 9000 builds.Monitor PPI & Viewing Distance CalculatorPixel density, real screen size and best desk distance for any monitor.FPS to Frame Time CalculatorFPS ↔ milliseconds, and the right FPS cap for G-Sync / FreeSync.80 Plus Bronze vs Gold vs Platinum: PSU Efficiency Savings CalculatorIs Platinum worth it over Gold? Yearly savings and payback on your usage.How Much RAM Do I Need? (16GB vs 32GB Advisor)16GB, 32GB or 64GB? A recommendation from four quick questions.Will My GPU Fit My Case? Clearance CheckerLength, thickness and cable clearance — will the card physically fit?CPU Bottleneck Estimator for GamingIs your CPU holding back your GPU? Check by resolution and GPU tier.PC Power Draw & Electricity Cost CalculatorWatts, kWh and yearly cost of running your gaming PC.Desk & Dual Monitor Setup PlannerDesk depth, width and layout for single, dual or ultrawide monitors.
Before you buy
Run your build through the PSU calculator before choosing a power supply — modern GPUs have large, brief power spikes that an undersized or older unit may not handle. When choosing a display, the PPI calculator shows whether text will look sharp at your desk distance, and the frame time calculator helps you set a sensible FPS cap for G-Sync or FreeSync.