BMI Calculator
Calorie Calculator
Compound Interest
Loan Calculator
Scientific Calculator
Percentage CalculatorAbout Calculator Proof
Calculator Proof is a free online calculator suite that puts six powerful, interconnected tools — BMI, calorie, compound interest, loan, scientific, and percentage calculators — in one fast, private, and easy-to-use place.
Our Mission
We believe everyday math should be simple, accurate, and free. Most calculator sites are slow, cluttered with ads, or charge for basic tools. Calculator Proof exists to give you reliable calculators that load instantly, respect your privacy, and talk to each other — so you enter your data once and use it everywhere.
What We Offer
The BMI calculator checks your body mass index in seconds, and its results flow straight into the calorie calculator, which estimates daily calorie needs and macro goals. The loan calculator computes EMI, total interest, and full amortization schedules, while the compound interest calculator shows how your investments grow over time. The scientific calculator handles trigonometry, logarithms, and advanced math with full keyboard support, and the percentage calculator solves everyday percentage problems instantly.
Why Calculator Proof?
Every calculator is free forever, works on any device, and runs entirely in your browser with no ads and no tracking. There is no sign-up, nothing to download, and your data is never sold. The tools follow standard formulas — like Mifflin-St Jeor and Harris-Benedict for calories — so the numbers you see are reliable for real everyday decisions.
Get in Touch
We are always working to make Calculator Proof better. If you have feedback, a feature request, or a question, we would love to hear from you.