All PC Hardware Calculators
Twenty-two free, client-side calculators for sizing, comparing, and budgeting your PC build. Every tool runs in your browser — no sign-up, no data sent anywhere.
2026 PC Hardware Sizing & Power Allocation Matrix
Standardized power supply headroom (PSU wattage), CPU/GPU pairing balance, and VRAM requirements for modern gaming rigs.
| System Class | Typical CPU + GPU Load | Recommended PSU Wattage | Safe Operating Temps | Target Resolution |
|---|---|---|---|---|
| Budget Gaming (Core i5 / Ryzen 5 + RTX 4060) | 250 – 320 Watts | 550W – 650W 80+ Bronze | CPU < 75°C · GPU < 70°C | 1080p 144Hz |
| Midrange Enthusiast (Ryzen 7 7800X3D + RTX 4070 Ti) | 420 – 520 Watts | 750W – 850W 80+ Gold | CPU < 82°C · GPU < 72°C | 1440p 165Hz+ |
| Ultra Flagship (Core i9 / Ryzen 9 + RTX 4090) | 650 – 800 Watts | 1000W – 1200W ATX 3.0 | CPU < 88°C · GPU < 75°C | 4K 144Hz HDR |
How to choose a calculator
Start with the job, not the tool list. Sizing a power supply or estimating yearly electricity cost belongs to the Power group — the PSU Wattage Calculator and PC Power Draw Estimator both start from your actual CPU and GPU. If you are weighing a purchase, the Build tools (Build Cost TCO, Upgrade ROI, FPS Budget Builder, Compatibility Check) compare price, performance, and part fit in one pass. The Performance group — Bottleneck Estimator, GPU VRAM Recommendation, CPU/GPU FPS Loss, and Quality vs Performance — helps you find the limiter in an existing rig, while the Cooling and Reference tools round out thermals, monitor, storage, and memory checks. Every figure is a planning estimate from typical component specs, so verify the final numbers against your own parts and current reviews before buying.