Free everyday calculators

Quick answers for money, health, dates and conversions — clear results, no sign-up.

Percentage CalculatorFree percentage calculator: find X% of a number, what percent one number is of another, and percentage increase or decrease. Age CalculatorCalculate exact age in years, months and days from a date of birth, plus total days lived and days until the next birthday. BMI CalculatorCalculate your Body Mass Index in metric or imperial units and see the WHO weight category and healthy weight range. Loan CalculatorCalculate monthly loan or mortgage payments, total interest and total cost from the amount, interest rate and term. Tip CalculatorCalculate the tip and split the bill evenly between any number of people. Choose 10%, 15%, 18%, 20% or a custom tip. Days Between DatesCount the number of days, weeks and business days between two dates. Optionally include the end date. Unit ConverterConvert between metric and imperial units: cm to inches, kg to lbs, Celsius to Fahrenheit, liters to gallons and more.

CalcNest collects the calculators people reach for most: working out percentages and discounts, exact age, BMI, monthly loan payments, splitting a restaurant bill, counting days between dates, and converting units.

Results update as you type and every calculation runs privately in your browser.