🧮 Free Online Calculators
Use our free online calculators for math, finance, health, fitness, and everyday calculations. Every calculator works instantly in your browser - no signup, no downloads, no data sent to servers. From mortgage payments to BMI, compound interest to GPA, we have the calculator you need.
40 free tools - no signup required
Percentage Calculator
Calculate percentages, percentage increase/decrease, and more
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes
BMI Calculator
Calculate your Body Mass Index and see what category you fall into
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and amortization schedule
Tip Calculator
Calculate tip amount and split the bill between multiple people
Loan Calculator
Calculate loan payments, total interest, and payoff timeline
Salary to Hourly Calculator
Convert between salary and hourly wage, accounting for hours and weeks worked
Compound Interest Calculator
Calculate compound interest growth over time with regular contributions
Date Calculator
Calculate the difference between two dates or add/subtract days from a date
GPA Calculator
Calculate your Grade Point Average from your course grades and credit hours
Calorie Calculator
Calculate your daily calorie needs based on age, weight, height, and activity level
Body Fat Calculator
Estimate your body fat percentage using the US Navy method
Pregnancy Due Date Calculator
Calculate your estimated due date and pregnancy timeline
Scientific Calculator
Full-featured scientific calculator with trigonometry, logarithms, and more
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions
Random Number Generator
Generate random numbers, pick random items from a list, flip coins, roll dice
Password Generator
Generate strong, secure passwords with customizable length and character types
Sales Tax Calculator
Calculate sales tax for any amount and tax rate. Includes US state tax rates
Inflation Calculator
Calculate the effect of inflation on purchasing power over time
Retirement Calculator
Estimate how much you need to save for retirement based on your goals
Pace Calculator
Calculate running pace, speed, distance, or time for your runs and races
Square Footage Calculator
Calculate the square footage of rooms, yards, and irregularly shaped areas
Electricity Cost Calculator
Calculate the electricity cost of running appliances based on wattage and hours
Fuel Cost Calculator
Calculate fuel cost for a trip based on distance, fuel efficiency, and gas price
Interest Rate Calculator
Calculate simple and compound interest on savings and loans
Standard Deviation Calculator
Calculate standard deviation, variance, mean, and other statistics for a data set
Discount Calculator
Calculate the sale price after applying a percentage or fixed discount
Unit Price Calculator
Compare unit prices to find the best deal when shopping
Paycheck Calculator
Estimate your take-home pay after taxes and deductions
Investment Return Calculator
Calculate investment returns with dividends and capital gains over time
Time Card Calculator
Calculate total work hours and pay from your time card entries
Average Calculator
Calculate mean, median, mode, and range for a set of numbers
Invoice Generator
Create professional invoices with your logo, line items, taxes, and payment terms. Download as PDF.
NewOnline Stopwatch & Timer
Free online stopwatch and countdown timer with lap tracking
BMR Calculator
Calculate your Basal Metabolic Rate - calories your body burns at rest
Dog Age Calculator
Convert your dog's age to human years using the latest scientific formula
Auto Loan Calculator
Calculate monthly car payments, total interest, and true cost of financing a vehicle
Net Worth Calculator
Calculate your total net worth by listing your assets and liabilities
Water Intake Calculator
Calculate how much water you should drink daily based on weight, activity, and climate
NewConcrete Calculator
Calculate cubic yards, bags, and cost of concrete for slabs, columns, walls, and footers
NewFrequently Asked Questions
Are these calculators accurate?▼
Yes. All calculators use standard mathematical formulas and are regularly tested for accuracy. Financial calculators use industry-standard amortization formulas, and health calculators use peer-reviewed equations like Mifflin-St Jeor and Harris-Benedict.
Do I need to sign up?▼
No. All calculators are completely free with no signup required. Your calculations are processed in your browser and never sent to any server.
Can I use these on mobile?▼
Yes. All calculators are fully responsive and work on phones, tablets, and desktops. Number inputs use the numeric keyboard on mobile for easier entry.