Calcspro is a free, ad-light collection of fast and accurate calculators for finance, education, health, and everyday life — built by a small team that genuinely cares about getting the math right.
Two short statements that drive every decision we make about Calcspro.
To make trustworthy calculators freely available to anyone with an internet connection — without dark patterns, paywalls, or interfaces designed to waste your time. Get the right answer, in seconds, on any device.
To become the most reliable everyday math companion on the internet — a place students, professionals, and curious minds turn to first when they need to convert, compare, plan, or decide with numbers.
Four principles that shape every calculator we ship.
Every page loads in under a second. No bloated frameworks, no tracking pixels, no spinners.
Formulas are sourced from official references and double-checked. We show our work in the FAQ.
Your inputs never leave your device. We don't store, sell, or share your calculation data — ever.
Every tool is built mobile-first. Pinch, tap, scroll — it just works on the device you have.
From a weekend itch to a globally-used calculator hub.
Frustrated by ad-laden calculator sites, our founder built a single percent calculator over a weekend. It went mildly viral on Reddit.
10 calculators across finance and health categories. The promise: clean, fast, accurate, free. Word of mouth spread fast.
30+ tools, 1M+ monthly users, full mobile redesign, dark theme by default, multi-currency support across financial calculators.
50+ calculators, 2M+ monthly calculations, served in 180+ countries. Building toward our vision of being the everyday math companion of the internet.
From mortgage math to test grades to time countdowns — chances are, we've built the calculator you need.
Plan budgets, loans, taxes, and investments with confidence — supports 35+ currencies.
From test grades to GPAs, customize the scale and see where you stand instantly.
Live countdowns, date math, age in any unit — because not all questions are about money.
A small, remote crew of engineers, designers, and educators.
Loves clean code, clean math, and iced coffee. Started Calcspro with one weekend project that wouldn't quit.
Obsessive about typography and dark themes. Believes utility software should be a pleasure to use.
Former math teacher. Writes the explainers, sources the formulas, and makes sure nothing is hand-wavy.
The best calculators we've shipped started as user requests. Tell us what you'd like to calculate next.