Fast, free calculators and tools for everyday problems.

Compound Interest Calculator

Estimate growth and interest earned from compounding over time.

Inputs

Fields marked with * are required.

Starting amount*This is the balance you start with before growth.Annual rate (%)*Use the nominal yearly rate before compounding.Compounds per year*12 means monthly compounding, 4 means quarterly, 1 means yearly.Years invested*Enter the total number of years the balance will compound.

Results

Your result updates after a successful calculation.

Estimated final balance

$16,470.09

Projected total balance after compounding.

Interest earned

$6,470.09

Growth above the original starting amount.

How it works

Short formula and logic summary for this tool.

Compound growth uses principal × (1 + rate ÷ compounds per year) raised to compounds per year × years.

Worked example

This shows how a starting balance grows with regular monthly compounding over a decade.

principal: 10000
annualRate: 5
timesPerYear: 12
years: 10

FAQ

Common questions about this tool.

Does this include extra contributions?

No. This version only models growth from the initial principal.

What does compounds per year mean?

It is how often interest is added to the balance each year, such as 12 for monthly compounding.