Quick answer
ComputingSkill has 16 free PC hardware calculators, covering bottlenecks, FPS, which games your PC can run, PSU wattage, power draw and electricity cost, cooling, RAM, VRAM, build cost, upgrades and part compatibility. Start with the PC Bottleneck Calculator to see whether your CPU or GPU limits your frame rate.
This is the full collection of PC hardware calculators on ComputingSkill.com. Each one takes a narrow, practical question — will this CPU bottleneck that GPU, how big a PSU do I actually need, how much will this build cost, how much RAM is enough — and turns it into an estimate you can get an answer to in under a minute. None of these tools require you to install anything, create an account, or run a benchmark on your own machine; you enter the parts or numbers you have (or are considering), and the calculator applies manufacturer specs, our gaming-performance index (for CPUs and GPUs) or a stated formula to give you a directional answer.
These calculators are aimed at people actually building, upgrading, or troubleshooting a PC — not people who already have a lab full of benchmarking rigs. If you’re picking parts for a new build, deciding whether an old CPU is worth pairing with a new GPU, sizing a power supply so it doesn’t trip under load, or just trying to understand why a “fast” PC still stutters, there’s a tool here for that. Every calculator page also explains, in plain language, how the underlying math works and where its estimates fall short — we’d rather you understand the limits of a number than treat it as gospel.
A couple of these tools are especially useful as a starting point if you’re new to PC building: the PC Bottleneck Calculator and the PC Build Cost Calculator are good first stops before you start shopping for parts, and the PC Compatibility Checker is worth a pass before you finalize any parts list. From there, the more specific calculators below help you dial in individual components — power, cooling, memory, and expected performance.
Performance & Compatibility
Power, Cooling & Build Planning
Memory, Upgrades & VRAM
Which One Do You Need?
Not sure where to start? Match your question to the tool:
- Will my CPU hold back my graphics card? PC Bottleneck Calculator
- Roughly what frame rate will my parts reach in a game? FPS Calculator
- Which games can my PC run, and at what settings? Can I Run It?
- How many watts does my power supply need? PSU Calculator
- Do my parts fit and work together? PC Compatibility Checker
- Which upgrade helps my PC most? PC Upgrade Calculator
- How much RAM do I need for what I run? RAM Calculator
- Is my card’s VRAM enough for my resolution? GPU VRAM Calculator
- What will this build cost and where does the money go? PC Build Cost Calculator
- What does my PC cost to run in electricity? PC Power Consumption Calculator
- Is air cooling enough or do I need an AIO? PC Cooling Calculator
- Just the two scores side by side, without game or settings? (Same engine as the Bottleneck Calculator.) CPU vs GPU Calculator
- Where does one graphics card rank? (Every card ranked: the GPU tier list.) GPU Performance Calculator
- Where does one CPU rank? (Every CPU ranked: the CPU tier list.) CPU Performance Calculator
- How much power does my graphics card alone draw? (CPU: the CPU Power Consumption Calculator.) GPU Power Consumption Calculator
Hardware specs come from the manufacturers, and the CPU and GPU tools share one gaming-performance score scale, placed from published review averages, so the bottleneck, FPS, upgrade and comparison pages never disagree about the same parts.
Frequently Asked Questions
Are these calculators as accurate as a real benchmark?
No, and we're upfront about that on every calculator page. They use manufacturer specs, our own gaming-performance index for CPUs and GPUs (placed from published review averages) and stated formulas to produce a reasonable estimate, not a measured result from running actual software on real hardware. Use them to narrow down decisions and sanity-check a build, not as a guarantee of the exact number you'll see in practice.
Which calculator should I use first when planning a new PC?
Most people planning a build from scratch get the most value starting with the PC Build Cost Calculator to set a budget, then the PC Bottleneck Calculator to check that the CPU and GPU you're considering are reasonably matched, followed by the PSU Calculator to size the power supply correctly.
Do I need to know exact part model numbers to use these?
The CPU and GPU tools ask you to pick your models from a list. If yours isn’t listed, choose “Other / not listed” where the tool offers it and then the listed part closest to yours, and the estimate uses that part’s data. The power, storage, internet and display tools take plain numbers such as watts, GB, Mbps or inches.
Are these calculators free to use?
Yes. All of the calculators on ComputingSkill.com are free, with no account or sign-up required.