Free Online Calculators
40 fast, accurate tools for finance, health, math, and more.
💰 Finance
Mortgage Calculator
Calculate monthly payments, total interest, and view amortization schedule.
Compound Interest Calculator
See how your investments grow over time with compound interest.
Tip Calculator
Calculate tip amount and split the bill between friends.
Loan Calculator
Calculate monthly payments and total cost for any loan.
Salary Converter
Convert between annual, monthly, weekly, and hourly pay.
Auto Loan Calculator
Calculate monthly car payments with trade-in and sales tax.
Retirement Calculator
Project your retirement savings with 401k and employer match.
Savings Goal Calculator
Calculate monthly savings needed to reach your financial goal.
ROI Calculator
Calculate return on investment from cost and current value.
Debt Payoff Calculator
Plan your debt payoff with snowball or avalanche method.
Credit Card Payoff Calculator
See how long it takes to pay off credit card debt.
Down Payment Calculator
Calculate savings timeline for a home down payment.
Inflation Calculator
See how inflation affects purchasing power over time.
❤️ Health & Fitness
BMI Calculator
Calculate your Body Mass Index and see your weight category.
Calorie Calculator
Estimate daily calorie needs based on your stats and activity.
Body Fat Calculator
Estimate body fat percentage using the US Navy method.
Ideal Weight Calculator
Find your ideal weight range using multiple formulas.
Macro Calculator
Calculate daily protein, carbs, and fat targets.
Due Date Calculator
Calculate your estimated due date from last period.
Water Intake Calculator
Calculate your daily water intake recommendation.
Heart Rate Zone Calculator
Calculate target heart rate zones for exercise.
BAC Calculator
Estimate blood alcohol content from drinks and body weight.
🔢 Math & Conversion
Percentage Calculator
Calculate percentages, percentage change, and more.
GPA Calculator
Calculate your GPA from course grades and credit hours.
Fraction Calculator
Add, subtract, multiply, and divide fractions.
Unit Converter
Convert between length, weight, temperature, and volume.
Scientific Calculator
Full-featured scientific calculator with advanced functions.
Number Base Converter
Convert between decimal, binary, hexadecimal, and octal.
Standard Deviation Calculator
Calculate standard deviation, mean, and variance.
Quadratic Equation Solver
Solve quadratic equations and find roots.
Random Number Generator
Generate random numbers with custom range and options.
Matrix Calculator
Calculate determinant, inverse, and multiply matrices.
🛠️ Everyday Tools
Age Calculator
Calculate exact age in years, months, and days.
Discount Calculator
Calculate sale price from original price and percent off.
Date Difference Calculator
Calculate the number of days between two dates.
Time Zone Converter
Convert time between different time zones worldwide.
Fuel Cost Calculator
Calculate trip fuel cost from distance, MPG, and gas price.
Square Footage Calculator
Calculate area from room dimensions for multiple rooms.
Concrete Calculator
Calculate cubic yards of concrete needed for your project.
Paint Calculator
Calculate gallons of paint needed for room dimensions.