All Calculators & Tools
Browse 80 free online tools organized by category.
Financial Calculators(12)
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.
Tip Calculator
Calculate tip amount and split the bill.
Discount Calculator
Calculate sale price after a percentage discount.
Salary Calculator
Convert salary between annual, monthly, and hourly.
Profit Margin Calculator
Calculate profit, margin, and markup.
Fuel Cost Calculator
Estimate fuel cost for a trip. Supports metric and US units.
Electricity Cost Calculator
Estimate electricity usage cost.
Health & Fitness(5)
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(12)
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.
Triangle Calculator
Solve any triangle given sides and angles. Supports SSS, SAS, ASA, AAS, and right triangles.
Area Calculator
Calculate the area and perimeter of common shapes: rectangle, circle, triangle, trapezoid, ellipse, parallelogram.
Volume Calculator
Calculate the volume and surface area of 3D shapes: cube, sphere, cylinder, cone, pyramid.
Scientific Notation Converter
Convert between standard numbers and scientific notation.
GPA Calculator
Calculate your Grade Point Average. Add courses with grades and credit hours.
Age Calculator
Calculate your exact age in years, months, and days.
Text Tools(6)
Word Counter
Count words, characters, sentences, and paragraphs.
Remove Spaces
Remove extra, leading, and trailing spaces from text.
Case Converter
Convert text between upper, lower, title, sentence, and toggle case.
Duplicate Line Remover
Remove duplicate lines from text instantly.
Slug Generator
Generate URL-friendly slugs from any text.
Keyword Density Checker
Analyze keyword frequency and density in text.
Unit Converters(23)
Unit Converter
Convert between units: length, weight, temperature, speed, volume, area, fuel.
Celsius to Fahrenheit
Convert Celsius temperatures to Fahrenheit.
Fahrenheit to Celsius
Convert Fahrenheit temperatures to Celsius.
Kilometers to Miles
Convert kilometers to miles.
Miles to Kilometers
Convert miles to kilometers.
Kilograms to Pounds
Convert kilograms to pounds.
Pounds to Kilograms
Convert pounds to kilograms.
Centimeters to Inches
Convert centimeters to inches.
Inches to Centimeters
Convert inches to centimeters.
Liters to Gallons
Convert liters to US gallons.
Gallons to Liters
Convert US gallons to liters.
Feet to Meters
Convert feet to meters.
Meters to Feet
Convert meters to feet.
Ounces to Grams
Convert ounces to grams.
Grams to Ounces
Convert grams to ounces.
MPH to KM/H
Convert miles per hour to kilometers per hour.
KM/H to MPH
Convert kilometers per hour to miles per hour.
Cups to Milliliters
Convert US cups to milliliters.
Milliliters to Cups
Convert milliliters to US cups.
Acres to Hectares
Convert acres to hectares.
Hectares to Acres
Convert hectares to acres.
Stones to Kilograms
Convert stones to kilograms.
Kilograms to Stones
Convert kilograms to stones.
Generators(5)
Password Generator
Generate strong, cryptographically random passwords.
Random Name Generator
Generate random first and last names for any purpose.
Random Number Generator
Generate random numbers within a custom range.
Color Picker
Pick colors and get HEX, RGB, and HSL values.
Lorem Ipsum Generator
Generate placeholder text for designs.
File Tools(3)
Developer Tools(10)
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.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 to text.
UUID Generator
Generate random UUID v4 identifiers.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa.
Markdown Preview
Write Markdown and see a live rendered preview side by side.