Clean calculators.
No junk. Just answers.
Six fast, accurate tools for everyday math — money, health, and time. Type your numbers, get your answer, get on with your day.
Mortgage Calculator
Monthly payment, total interest, and a full amortization schedule — with taxes and insurance included.
$320,000 @ 6.5% → $1,855/mo Calculate my payment →Currency Converter
Live mid-market exchange rates for 150+ currencies, updated daily from financial market data.
100 USD → 92.41 EUR Convert currency →Calorie Calculator
Find your daily calorie needs based on your age, size, and activity level — maintenance, loss, or gain.
TDEE ≈ 2,340 kcal/day Find my calories →BMI Calculator
Body mass index from your height and weight, with healthy-range context in metric or imperial units.
5'9" · 160 lb → BMI 23.6 Check my BMI →Age Calculator
Your exact age in years, months, and days — or how old you were (or will be) on any date.
Born 1990 → 36 yr 2 mo 4 d Calculate age →Date Calculator
Days between two dates, or add and subtract days, weeks, and months from any starting date.
Jun 12 → Dec 25 = 196 days Count the days →Why TidyCalcs?
Most calculator sites bury the answer under clutter. We keep it tidy.
Instant results
Every tool runs right in your browser. No loading screens, no multi-step wizards — answers appear as you type.
Accurate methods
Standard, transparent formulas: real amortization math, mid-market exchange rates, and the Mifflin-St Jeor equation for calories.
Nothing to install
No accounts, no downloads, no email required. Works on your phone, tablet, or computer.
Your data stays yours
The numbers you enter are processed in your browser and never stored on our servers.