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Free online calculators for health, finance, math, and everyday life. Fast, accurate, and easy to use.
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Health & Fitness
BMI, BMR, calorie, and body composition calculators
Finance
Loan, mortgage, interest, and investment calculators
Math
Percentage, fraction, algebra, and geometry calculators
Date & Time
Age, date difference, and timezone calculators
Everyday
Tip, unit conversion, and other handy calculators
Science
Physics, chemistry, and engineering calculators
All Calculators (34)
Health & Fitness
Calculate your Body Mass Index to check if your weight is healthy
Find your Basal Metabolic Rate to understand daily calorie needs
Estimate daily calorie intake based on your activity level
Estimate your body fat percentage using simple measurements
Find your ideal weight range based on height, age, and gender
Calculate your Total Daily Energy Expenditure based on BMR and activity level
Calculate your ideal macronutrient ratio for protein, carbs, and fat based on your goals
Estimate your baby's due date based on your last period, conception date, ultrasound, or IVF transfer date
Calculate your calorie deficit for weight loss using TDEE and BMR with personalized macro breakdowns and weekly projections
Finance
Calculate monthly payments and total interest for any loan
Estimate your monthly mortgage payment and total cost
See how your investments grow over time with compound interest
Plan your savings goals and track progress over time
Convert salary between hourly, daily, weekly, biweekly, monthly, and annual pay periods with vacation and holiday adjustments
Math
Calculate percentages, increases, decreases, and differences
Add, subtract, multiply, and divide fractions easily
Calculate the mean, median, and mode of a set of numbers
Calculate your semester and cumulative grade point average on a 4.0 scale
Calculate standard deviation, variance, and mean for any data set with step-by-step solutions
Calculate your weighted average grade, find what score you need on your final exam, and convert between letter grades and percentages
Calculate the volume of 12 different 3D shapes including cubes, cylinders, spheres, cones, and more with unit conversions
Calculate the missing side of a right triangle using the Pythagorean theorem with step-by-step solutions
Date & Time
Calculate exact age in years, months, and days
Find the number of days, weeks, or months between two dates
Convert time between different time zones worldwide
Add, subtract, and calculate time differences in hours, minutes, and seconds with decimal conversion
Everyday
Quickly calculate tips and split bills among friends
Convert between metric, imperial, and other measurement units
Calculate sale prices and savings from percentage discounts
Calculate area in square feet for rooms, homes, and projects with cost and material estimates
Calculate how much concrete you need for slabs, footings, columns, walls, and stairs with bag counts and cost estimates