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Interest Calculator

Project compound interest with recurring deposits and a selectable compounding schedule.

Inputs

Results update as you edit.

$
$
%
years

Ending balance

$55,290.66

Results update as the calculator inputs change.

Interest earned

$15,290.66

Total contributions

$30,000.00

Starting principal

$10,000.00

Effective gain

38.23%

Breakdown

Result components shown side by side.

Starting principal$10,000.00
Deposits$30,000.00
Interest$15,290.66

How to Calculate Interest Growth

Starting Principal
The starting balance is the amount that begins earning interest immediately.
Compounding
Compounding adds earned interest back to the balance so future interest can grow on interest.
Time Horizon
More time gives compounding more periods to work, especially with recurring deposits.

How Interest Builds Over Time

Interest growth depends on principal, rate, deposits, compounding frequency, and time. The calculator separates contributions from earned interest so you can see what came from saving and what came from growth.

What Factors Affect Interest?

Principal

A larger starting amount creates a larger base for interest.

Annual Rate

Higher rates increase growth, but actual returns can vary for investments.

Deposit Habit

Recurring deposits can matter as much as the starting balance over long periods.

Compounding Frequency

More frequent compounding slightly increases growth when the stated rate is the same.

Years Invested

Longer time horizons increase the effect of compounding.

Inflation

Nominal growth may overstate purchasing-power growth when inflation is high.

Common Interest Calculations

Future Value

Estimate what today's balance and deposits could become.

Interest Earned

Separate deposited money from the amount generated by interest.

Scenario Testing

Compare rates, deposits, and time horizons side by side.

Frequently Asked Questions

What is compound interest?

Compound interest means earned interest is added to the balance, allowing future interest to be calculated on both principal and prior interest.

Does compounding frequency matter?

Yes, but the effect is usually smaller than changes in rate, contribution amount, or time horizon.

Is the interest rate guaranteed?

For savings products it may be stated by the institution. For investments, the rate is only an assumption and actual returns can be higher or lower.

Why separate contributions from interest?

Separating them shows how much of the ending balance came from your deposits versus growth.

How can I use this for planning?

Test several rates and deposit amounts, then focus on the savings habit and time horizon you can realistically sustain.