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Interest Calculator

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

Calculator.net reference
Inputs
Defaults are prefilled so the result is visible immediately.
$
$
%
years
Results
Results update as the calculator inputs change.

Ending balance

$55,290.66

Interest earned

$15,290.66

Total contributions

$30,000.00

Starting principal

$10,000.00

Effective gain

38.23%

Starting principal$10,000.00
Deposits$30,000.00
Interest$15,290.66
Formula and Assumptions
Balance is compounded each period: balance = balance x (1 + r) + contribution.

Recurring deposits are converted to the selected compounding interval.

Use the chart to separate what you put in from what the interest rate generated.

Reference Upgrade
Built from the Calculator.net model, with added context.

Live validation and instant result updates instead of a submit-only workflow.

Multiple decision metrics are shown together, not only the primary answer.

Formula notes and assumptions are visible on the page so the math is easier to audit.

Reference Model

Modeled after the input style and primary output on Calculator.net's Interest Calculator.

The page keeps the math in one place and exposes the assumptions beside the result.

Default inputs: principal=10000, monthlyDeposit=250, interestRate=5, years=10, compounding=12