The CalcNova library

All calculators

Find the right tool for your next question. Every calculator is free to use and gives you a clear explanation with the result.

10 helpful tools6 categoriesFree, always

Math & Numbers

Make everyday percentages and numbers easier.

1 tool

Math & NumbersPercentage CalculatorWork out a percentage of a number, find what percent one value is of another, or calculate percentage change.

Shopping & Finance

Understand discounts, interest, and loan payments.

3 tools

Shopping & FinanceDiscount CalculatorCalculate your sale price and savings from an original price and discount percentage.Shopping & FinanceSimple Interest CalculatorEstimate simple interest and the total amount from a principal, annual rate, and time period.Shopping & FinanceLoan EMI CalculatorEstimate a fixed monthly loan payment, total repayment, and total interest from loan terms.

Health & Wellness

Explore general health and measurement tools.

1 tool

Health & WellnessBMI CalculatorCalculate body mass index from height and weight, with a standard adult BMI category guide.

Date & Time

Work with ages, dates, and durations.

3 tools

Date & TimeAge CalculatorFind your exact age in years, months and days, or calculate the time between any two birthdays.Date & TimeDate CalculatorFind the number of days between dates, or add and subtract calendar days from a date.Date & TimeTime CalculatorCalculate the duration between two clock times, including a shift that passes midnight.

Education

Estimate grades and academic averages.

1 tool

EducationGPA CalculatorCalculate a credit-weighted GPA on a common 4.0 scale from course grades and credit hours.

Everyday Tools

Convert measurements and more.

1 tool

Everyday ToolsUnit ConverterConvert common length, mass, volume, time, and temperature units in one place.