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Popular Calculators
Our most frequently used tools.
Percentage
Calculate percentages, find what percent one number is of another, and measure percentage change.
Loan
Estimate monthly payments, total interest, and total cost for a fixed-rate loan.
Mortgage
Estimate monthly mortgage payments from home price, down payment, rate, and loan term.
Compound Interest
See how a balance grows with compound interest and optional regular contributions.
BMI
Check Body Mass Index from height and weight using metric or imperial units.
Pregnancy Due Date
Estimate a due date from the first day of the last menstrual period using Naegele’s rule.
Calories
Estimate daily calorie needs from BMR and activity level, with cut and surplus targets.
Age
Find exact age in years, months, and days from a date of birth.
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Clear
Each tool shows the formula, a worked example, and the assumptions behind the result.
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