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Free online calculators for finance, health, math, and everyday needs
Calculate your exact age in years, months, and days
Calculate the number of days, weeks, and months between two dates
Calculate how much gas will cost for your trip
Scale recipe ingredients up or down for any number of servings
Calculate the sale price, savings, and final cost after discount and tax
Convert between Unix timestamps and human-readable dates
Convert between hundreds of units across length, weight, temperature, volume, and more
Convert time between world time zones with an interactive world clock display
Convert between Fahrenheit, Celsius, Kelvin, and Rankine
Calculate your monthly mortgage payment, total interest, and amortization schedule
Calculate monthly payments for any fixed-rate loan — auto, personal, or student
Calculate how your savings and investments grow over time with compound interest
Calculate tips and split the bill easily for any meal or service
Convert between annual salary and hourly rate with full pay period breakdown
Calculate return on investment percentage and annualized returns
See how long it takes to pay off debt and how much interest you will pay
Calculate your Body Mass Index and see where you fall on the healthy weight scale
Calculate your daily calorie needs based on age, activity level, and goals
Estimate your body fat percentage using the U.S. Navy method
Find your ideal body weight using four clinical formulas
Calculate your estimated due date and current pregnancy progress
Calculate your daily protein, carb, and fat targets in grams
Calculate percentages, percent changes, and percentage of numbers
Add, subtract, multiply, and divide fractions with automatic simplification
Solve linear and quadratic equations step by step
Calculate mean, median, mode, standard deviation, and more from a dataset
Full-featured scientific calculator with trigonometry, logarithms, and memory functions