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.
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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 postsIs It Actually a Deal? The Math of Holiday Sales
Stacked discounts, inflated 'original' prices, buy-more-save-more — holiday sales are designed to feel like deals. Here's the quick math that tells you which ones really are.
October 21, 2026 · 4 min
MathReading the Polls: What the Margin of Error Really Means
With the midterms days away, poll numbers are everywhere — and routinely misread. Here's the math behind the margin of error, and how to tell a real lead from a statistical tie.
October 14, 2026 · 4 min
FinancialYear-End Retirement Moves: Maxing Out Before the Deadline
The calendar — not just your budget — decides how much you can save for retirement this year. Here's what to top up before December 31, and what can wait.
October 7, 2026 · 4 min
Precise by construction
Financial math runs on exact decimal arithmetic — never floating-point guesswork.
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