Updated
Using Financial calculator
Future balance = starting balance × (1 + rate)^periods + payment × ((1 + rate)^periods − 1) ÷ rate. At zero rate, add the contributions directly.
The rate uses the same period as contributions. Payments are made at period end. The rate is constant; tax, fees, withdrawals and inflation are excluded. This is a scenario, not a return forecast.
A worked example
With starting balance = 1000, contribution each period = 100, rate per period (%) = 10, number of periods = 2, the future balance is 1,420.00 (rounded to two decimal places).
Before you use the result
The rate uses the same period as contributions. Payments are made at period end. The rate is constant; tax, fees, withdrawals and inflation are excluded. This is a scenario, not a return forecast. Calculations keep full browser-number precision. Money amounts are displayed to two decimal places; other results use up to 12 significant digits. Very large values may lose precision.
Example results for starting balance
These examples use Contribution each period: 100; Rate per period (%): 10; Number of periods: 2. They are reference calculations, not recommended settings.
| Starting balance | Future balance |
|---|---|
| 500 | 815.00 |
| 1000 | 1,420.00 |
| 2000 | 2,630.00 |
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ToolOctopus. “Financial calculator.” Updated 2026-09-26. https://tooloctopus.com/financial-calculator.
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