Compound Interest Calculator
How much will my savings grow with compound interest and monthly deposits?
Single calculationv1.0.0Verified 2026-11-01Runs in your browser
Spec sheet
compound_growth_monthly_contrib · v1.0.0Method
Discrete compounding with end-of-month contributions
- 01
Effective monthly rate i = (1 + r/m)^(m/12) − 1 - 02
B(t+1) = B(t) · (1 + i) + C - 03
Future value = B(12 · years)
Limits — read before relying on it
- Constant rate; no taxes, fees or inflation.
- Contributions are made at the end of each month.
Sources
- Compound interest and future value of an annuityformula