Compound Interest Calculator

Project a balance from an initial amount, monthly contributions, annual rate and time horizon.

Calculator

Enter all monetary amounts in the same currency. Results do not convert currency or replace lender, tax or investment documentation.

Total contributed22,000
Projected ending balance31,998.32
Projected growth9,998.32
Months120

Method and inputs

Formula: future value = P(1 + r/12)^(12y) + C[((1 + r/12)^(12y) - 1) / (r/12)]

Inputs: Initial balance, end-of-month contribution, assumed annual rate and years.

Worked example

$10,000 at an assumed 5% annual rate with $100 monthly contributions for 10 years grows to about $31,998 before taxes and fees.

Important limits

This is a mathematical projection, not an investment recommendation or guaranteed return. It excludes taxes, fees, inflation, losses and changes in contribution or return rate.