PAY, TAX, DEBT, AND HOUSEHOLD PLANNING
Compound Interest Calculator
Estimate future value from a starting balance, annual return, time horizon, and recurring monthly contribution.
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Enter your values and select Calculate. Your result stays on this device.
How it works
Future value combines compounded starting principal with the future value of monthly contributions.
Assumptions
Uses a constant nominal annual return compounded monthly. It does not account for taxes, fees, losses, or changing returns.
Use case
compound interest calculator: a clear planning check
Estimate future value from a starting balance, annual return, time horizon, and recurring monthly contribution. The stated formula, assumptions, and result limits remain visible so the calculation can be checked in context.
Use a clear compound interest calculator scenario with values you can verify before relying on the result.
Method and update
Last reviewed: 2026-08-08. This tool performs the stated formula locally in your browser using the values you enter.
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