Free Online Calculators & Tools
Practical calculators for finance, math, health, conversions, and more.
Calculator Categories
Financial Calculators
Loan, mortgage, interest, savings, and more
12 tools
Health & Fitness
BMI, calories, water intake, sleep cycles
5 tools
Math Calculators
Scientific, triangle, fractions, statistics
12 tools
Text Tools
Word counter, case converter, slug generator
6 tools
Unit Converters
Length, weight, temperature, speed, volume
23 tools
Generators
Passwords, random numbers, lorem ipsum
5 tools
File Tools
PDF, image conversion and optimization
3 tools
Developer Tools
JSON, Base64, regex, UUID, timestamps
10 tools
Date & Time
Date difference, countdown timer
3 tools
Security Tools
Password strength checker
1 tools
Most Popular Calculators
View all →Scientific Calculator
Perform advanced math with trigonometry, logarithms, powers, and more.
BMI Calculator
Calculate your Body Mass Index. Supports metric (cm/kg) and US (ft-in/lbs) units.
Loan Calculator
Calculate monthly loan payments and total interest.
Percentage Calculator
Calculate percentages with multiple modes.
Compound Interest Calculator
Calculate compound interest over time.
Unit Converter
Convert between units: length, weight, temperature, speed, volume, area, fuel.
Calorie Calculator
Estimate daily calorie needs. Supports metric and US units.
Age Calculator
Calculate your exact age in years, months, and days.
Triangle Calculator
Solve any triangle given sides and angles. Supports SSS, SAS, ASA, AAS, and right triangles.
Word Counter
Count words, characters, sentences, and paragraphs.
JSON Formatter
Format, validate, and beautify JSON data.
Password Generator
Generate strong, cryptographically random passwords.
🏦 Financial Calculators
See all →Loan Calculator
Calculate monthly loan payments and total interest.
Mortgage Calculator
Estimate monthly mortgage payments with down payment.
Compound Interest Calculator
Calculate compound interest over time.
Savings Calculator
Project savings growth with regular monthly contributions.
Investment Return Calculator
Calculate total and annualized investment returns.
Payment Calculator
Calculate loan payments or find out how much you can afford to borrow.
❤️ Health & Fitness
See all →BMI Calculator
Calculate your Body Mass Index. Supports metric (cm/kg) and US (ft-in/lbs) units.
Calorie Calculator
Estimate daily calorie needs. Supports metric and US units.
Water Intake Calculator
Calculate recommended daily water intake.
Sleep Calculator
Find optimal sleep and wake times based on sleep cycles.
BMR Calculator
Calculate your Basal Metabolic Rate and daily calorie needs by activity level. Supports metric and US units.
🔢 Math Calculators
See all →Percentage Calculator
Calculate percentages with multiple modes.
Average Calculator
Calculate the mean, median, and mode of a set of numbers.
Standard Deviation Calculator
Calculate standard deviation and variance.
Fraction Calculator
Add, subtract, multiply, and divide fractions.
Ratio Calculator
Solve proportions and simplify ratios.
Scientific Calculator
Perform advanced math with trigonometry, logarithms, powers, and more.
💻 Developer Tools
See all →JSON Formatter
Format, validate, and beautify JSON data.
JSON Validator
Validate JSON syntax and find errors.
URL Encoder
Encode text for safe use in URLs.
URL Decoder
Decode URL-encoded strings back to text.
Regex Tester
Test regular expressions against text in real time.
CSS Gradient Generator
Generate CSS linear gradient code visually.