About UnitPrism

UnitPrism started as a personal project to build the kind of calculator site the creator actually wanted to use — one that gives you the answer instantly, explains what it means, and occasionally surprises you with a fact you didn't know you needed. No account required, no paywalls, no dark patterns.

What We Build

UnitPrism covers finance calculators (mortgage, compound interest, retirement, DRIP calculator, loan, salary, income tax), health calculators (BMI, calorie, body fat, ideal weight), unit converters (weight, distance, temperature, volume, speed, area, data, time, pressure, energy, and currency with live rates), and general calculators (percentage, fractions, date difference, age, Roman numerals, and more). Every tool is free and works on any device — phone, tablet, or desktop.

Our Philosophy

Three things matter. Speed — results appear as you type, because waiting for a calculation result is just friction you don't need. Context — a number without context is just a number, so we add real-world comparisons and the occasional surprising fact to make results actually meaningful. Honesty — where we include affiliate links to products we think are genuinely useful, they're always labeled. No fake "expert" credentials. No SEO filler paragraphs written to pad a word count. Just tools that do their job.

Who Made This

UnitPrism is built and maintained by a solo developer. It runs on Cloudflare Pages and is intentionally lightweight — no heavy frameworks, no tracking beyond Google Analytics, no third-party data selling. Feedback is genuinely welcome and actually read. If something is broken, confusing, or missing, the contact page goes straight to someone who can fix it.

Our Commitment

The calculators will always be free. The site will stay fast and ad-light — we'd rather show fewer ads and have you come back than clutter every page and drive you away. Content is updated regularly, and if you spot an error or a calculator that should exist but doesn't, reach out. Getting the numbers right matters more than anything else on this site.