Compound Interest Calculator

Enter principal, monthly contributions, annual rate, and years to estimate how your savings or investments may grow.

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Interactive Tool

Initial principalMonthly contributionAnnual rate (%)Years

Monthly compounding

$67,357.77

Total contributed

$46,000.00

Estimated interest

$21,357.77

This compound interest calculator helps you model long-term savings, retirement planning, and recurring investment contributions.

The result shows future value, total cash contributed, and estimated interest so you can compare scenarios quickly.

Enter starting balance
Add your initial principal or current investment balance.
Set contribution and rate
Enter monthly contribution, expected annual return, and investment period.
Review growth
Compare future value against total contributions to see estimated compound earnings.

Monthly investing

Estimate a recurring investment plan.

Input

$10,000 principal, $300 monthly, 6%, 10 years

Output

Future value around $64,000

Savings comparison

Compare different return assumptions.

Input

$5,000 principal, $200 monthly, 4%, 5 years

Output

Future value and estimated interest

Is the result guaranteed?

No. The calculator is an estimate based on a fixed annual rate and monthly compounding. Actual investment returns vary.

Does it include taxes or fees?

No. Use the rate field after fees or taxes if you want a more conservative estimate.