Honest PC hardware calculators
Size your power supply, understand monitor pixel density, and check GPU power connectors — with transparent math, cited assumptions, and update dates. No hype, no fake recommendations.
Three tools to start
Each one shows its work: the formula, the assumptions, and where the numbers come from.
PSU Wattage Calculator
Size your power supply with honest headroom math.
Pick your CPU and GPU (or enter wattages manually), add your accessories, and get a recommended PSU wattage with transparent assumptions — minimum, comfortable, and the retail tier to buy.
Open toolMonitor PPI Calculator
Pixel density, pixel pitch, and viewing distance.
Enter screen size and resolution to get PPI, pixel pitch in millimeters, the retina viewing distance, and a comfortable distance range — plus what the density means for office work, gaming, and design.
Open toolGPU Power Connector Checker
Which power cables your graphics card needs.
Select a GPU to see its power connector requirement, estimated board power, a recommended PSU range, whether an ATX 3.x unit makes sense, and the cable safety notes that actually matter.
Open toolWhy use Hardware Math
Transparent by default
Every result is an estimate, and we say so. We show the formula, the headroom we add, and the vendor figures we started from — no black boxes.
No tracking, no ads
The first version runs no analytics, no advertising scripts, and sets no cookies. Your inputs never leave your browser.
Original, not scraped
All illustrations are our own SVG artwork. We use no brand logos, no product photos, and we never invent an 'official' data source.
Built to be verified
Sample hardware data is flagged when it needs checking, and every page carries a last-updated date so you know how fresh it is.
Data transparency
Our hardware figures are best-effort sample data drawn from vendor-published limits. Entries we have not yet re-verified are clearly marked in the tools, and the full history lives on the Data Changelog. Always confirm against the manufacturer's official specification before you buy.
Hardware data last updated: 2026-07-08
View the Data Changelog →Safety & compliance in brief
Hardware Math is independent and not affiliated with any hardware brand. Results are estimates for planning, not electrical, engineering, or purchasing advice. Verify against official specifications and follow manufacturer safety guidance before building.
Read the full disclaimer →Where this is going
The first release focuses on three well-built tools and five in-depth guides. Next up: more verified hardware data, additional guides prioritized by real search demand, and a low-cost download-time calculator. New languages will follow only after human review.
See the roadmap in the guides →Size your next build the honest way
Start with the PSU calculator — it takes about a minute and shows exactly how it reached its recommendation.
Start with the PSU Calculator