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Compound Interest & Growth Calculator

Project how an initial balance and recurring contributions may grow—then account for inflation, estimated tax on gains, and different return scenarios.

Recurring depositsPrivate calculationYearly projection
Starting assumptions01
Up to 50 years.
Can be negative for loss scenarios.
Recurring contributions02
Useful for modeling contributions that rise with income.
Real-world adjustments03
Shows future value in today’s purchasing power.
Applied once to positive gains for planning.
Returns are hypothetical and assumed constant. Actual investments fluctuate and taxes may apply differently by account, asset, and jurisdiction.
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Your growth projection will appear hereEnter an initial amount, return assumption, time period, and optional recurring contributions.
Projected after-tax future value
Nominal estimated balance
Total contributed
Investment growth
Inflation-adjusted value
Estimated tax on gains
Effective annual return
Growth multiple

Future value composition

Initial principal
Added contributions
Net growth

Balance growth over time

StartYear 15

Return scenario comparison

6% return
8% return
10% return

Year-by-year projection

YearContributedGrowthBalanceToday’s value

Recurring contributions

Model monthly or annual deposits, choose beginning or end timing, and optionally increase contributions each year.

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Real-value estimate

See both nominal growth and an inflation-adjusted estimate in today’s purchasing power.

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Return scenarios

Compare your chosen rate with returns two percentage points lower and higher—without implying certainty.

Understanding compound growth

Compounding earns returns on both previous contributions and accumulated growth. Time, return, contribution size, fees, taxes, and inflation can all materially change the outcome.

Contribution timing matters

Beginning-of-period deposits receive one extra period of growth compared with end-of-period deposits.

Nominal versus real value

Nominal value is the future account balance. Inflation-adjusted value estimates what that balance may buy in today’s money.

Returns are not smooth

The calculator assumes a constant rate for planning. Real markets can rise or fall substantially from year to year.

Tax is simplified

The optional tax rate is applied once to positive total gains. It does not model annual taxation, allowances, or account-specific rules.