Calculator Uni — free online calculators
Run the numbers, properly.
Precise calculators for mortgages, macros, means, and everything in between — with clear results and charts that explain them.
01Most used
Ranked by search volume
Mortgage Calculator
Estimate your monthly mortgage payment with taxes, insurance, and a full amortization schedule.
BMI Calculator
Check your body mass index and see where it falls on the healthy range.
Loan Calculator
Work out payments, total interest, and payoff time for any fixed-rate loan.
Calorie Calculator
Find your daily calorie needs for maintenance, cutting, or bulking.
Compound Interest Calculator
See how savings and investments grow with compounding over time.
Percentage Calculator
Solve any percentage problem: percent of, percent change, and more.
Fraction Calculator
Add, subtract, multiply, and divide fractions with simplified results.
Auto Loan Calculator
Estimate car payments including trade-in value, sales tax, and dealer fees.
02The collections
03From the Journal
All postsHeart-Rate Training Zones: What Zone 2 Actually Does
Zone 2 is everywhere in fitness right now. Here's what the heart-rate zones really mean, how to find yours, and how to use them without a lab test.
September 2, 2026 · 4 min
EverydayWhat Your Commute Really Costs (and How to Cut It)
Gas is only the part you notice. Once you add wear, tolls, parking, and time, the real price of getting to work can reshape how — and how often — you go.
August 26, 2026 · 4 min
MathPercent vs. Percentage Points: The Difference That Changes the Story
A rate going from 2% to 5% rose either '3 points' or '150%' — same event, wildly different headlines. Here's how to tell them apart and never be misled again.
July 29, 2026 · 3 min
Precise by construction
Financial math runs on exact decimal arithmetic — never floating-point guesswork.
Charts that explain
Every result comes with the visualization that makes it make sense.
Private by default
Calculations run entirely in your browser. Your numbers never leave your device.