Free online calculators
🔄 Updated regularly · just nowAge, days between dates, percentages, discounts, loans, BMI and unit conversions — fast, free and private (everything runs in your browser).
Data as of Nov 12, 2026
🎂Age calculatorYour exact age in years, months and days, days lived and the next birthday.📅Days until / between datesHow many days until a date, or between two dates, including weeks and weekdays.➕Add or subtract daysFind the date N days before or after any date, with the weekday.％Percentage calculatorX% of Y, what percent X is of Y, and percentage increase or decrease.🏷️Discount calculatorSale price and how much you save from the original price and discount rate.🏦Loan payment calculatorMonthly payment and total interest for a fixed-rate loan (equal monthly payments).⚖️BMI calculatorBody mass index from height and weight, with the WHO category.📏Length converterConvert mm, cm, m, km, inches, feet, yards and miles.🧮Weight converterConvert grams, kilograms, tonnes, ounces, pounds and stones.🌡️Temperature converterConvert Celsius, Fahrenheit and Kelvin instantly.
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