Free Online Calculators 2026 — Salary, VAT, BMI, Tax, Currency & Unit Converter

Daily calorie needs, BMR and macro split for your goals.

Body Mass Index in seconds — WHO adult classification, healthy range included.

The best bedtimes and wake times based on 90-minute sleep cycles.

Add or remove VAT instantly at any rate — 20%, 5% or custom.

Gross ↔ Net for 9 countries with current tax rates and employer cost.

Figure out what to charge per hour based on your target income.

Compound interest + monthly contribution with a growth chart.

See how inflation erodes purchasing power — and how much nominal you need to stay even.

Three numbers for your next raise: walkaway, target and stretch — with tips.

Break-even year and true cost of buying vs. renting — NYT-style.

Margin, markup and profit per unit for sellers and shops.

Dividend tax across the EU and US with up-to-date rules.

Plan crypto trades — target sell price, ROI and profit from buy price + investment + target %.

Length, weight, volume, temperature and more, at lightning speed.

Add days to any date, or find the exact time between two dates.

Find out exactly what you need on the final to hit your target grade.

Exact age in years, months and days from any two dates.