Compound Interest Calculator
Compound Interest Calculator projects how an investment grows over time given the principal, annual rate, duration and how often interest compounds.
Last updated: July 2026
Calculate compound interest and final balance from principal, rate, time and compounding frequency. Free, instant compound interest calculator.
Loading tool…
How to use Compound Interest Calculator
- Enter the principal, annual rate and number of years.
- Choose the compounding frequency.
- Read the final balance and interest earned.
Frequently asked questions
What compounding frequencies are supported?
Annually, semi-annually, quarterly, monthly and daily.
What's the formula?
Future value = P × (1 + r/n)^(n·t), where n is the compounds per year and t the number of years.
Does it include contributions?
This version calculates growth on a single lump sum. Treat additional deposits separately.
Related calculators
Age Calculator
Calculate exact age in years, months and days from any date of birth — plus total months, weeks and days. Free and instant.
Percentage Calculator
Calculate percentages three ways: X% of a number, what % one number is of another, and percentage increase or decrease. Free and instant.
BMI Calculator
Calculate your Body Mass Index (BMI) in metric or imperial units and see your weight category instantly. Free and private.
Loan / EMI Calculator
Calculate your monthly loan EMI, total interest and total payment from the loan amount, interest rate and tenure. Free and instant.