Free Online Calculators

51 calculators for finance, health, maths, science and dates — all with step-by-step workings. No sign-up, no fees, ever.

51
Calculators
5
Categories
Free
Always
0
Sign-ups

// Browse by category

💰
Finance
18 calculators
Mortgage, loans, tax, retirement, salary and investments
🏥
Health
10 calculators
BMI, calories, body fat, pace, heart rate and macros
🔢
Math
9 calculators
Percentage, fractions, averages, probability and more
🔬
Science
8 calculators
Unit converter, periodic table, Ohm's law, energy, force
📅
Date & Time
6 calculators
Age, date difference, countdown and time zones

// Most popular calculators

🏠Mortgage CalculatorFinance› ⚖️BMI CalculatorHealth› %Percentage CalculatorMath› 📈Compound InterestFinance› 📏Unit ConverterScience› 🎂Age CalculatorDate› 🧾Income Tax CalculatorFinance› 🥗Calorie CalculatorHealth› 🔬Scientific CalculatorMath› 🌡️Temperature ConverterScience› 💼Salary CalculatorFinance› 📐Date DifferenceDate›

// How CalculatorXP works

1

Choose a calculator

Browse by category or search all 51 tools

2

Enter your values

Type in your numbers — results update instantly

3

See the working

Every result shows the formula and step-by-step explanation

4

Export or share

Print, download CSV or share — built into every page

About CalculatorXP

CalculatorXP is a free collection of online calculators designed to be genuinely useful. Every calculator shows step-by-step working so you understand the result, not just the number. All 51 calculators work on any device — mobile, tablet or desktop — and require no sign-up or download.

Finance calculators support USD, GBP, EUR and PLN. Health calculators use metric and imperial units and are based on published medical formulas. Math and science calculators are designed for students and professionals alike.