Interest Calculator

A precision tool for modeling financial growth and borrowing costs.

Calculation Parameters
$
%
yrs
Growth Reference

Compound interest is "interest on interest." It causes your balance to grow at an accelerating rate over time.

Formula Guide
A = P(1 + r/n)ⁿᵗ
Doubling Time (Rule of 72)
At 4% Rate18 Years
At 6% Rate12 Years
At 8% Rate9 Years
Financial Tip

The frequency of compounding matters. Compounding daily will always result in a higher balance than compounding annually, even if the interest rate is identical.

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