Compound Interest Calculator
See how savings grow with compounding and regular contributions.
Loading tool
This tool runs in your browser. Nothing is uploaded.
About Compound Interest Calculator
Compound Interest Calculator applies A = P(1 + r/n)^(nt), then adds any regular monthly contribution, and shows the balance year by year.
For savers comparing accounts and anyone learning how compounding works.
What it does
- Annual, quarterly, monthly or daily compounding
- Optional monthly contributions
- Interest earned versus money paid in
- Year-by-year table
How to use Compound Interest Calculator
- Enter the starting amount, annual rate and years.
- Pick the compounding frequency.
- Add a monthly contribution if you make one.
- Read the final balance and table.
Frequently asked questions
How are monthly contributions compounded?
Each contribution is added at the end of its month and earns interest at the equivalent monthly rate from then on.
Are taxes or inflation included?
No. Results are nominal and before tax.
Limits and privacy
Before tax and inflation. Assumes a constant rate.
Everything happens on your device, so your content never reaches our server.
Related tools
Simple Interest CalculatorCalculate simple interest and the total amount using I = P × r × t.In browserLoan Repayment CalculatorEstimate regular loan payments, total interest and a full amortisation schedule.In browserMortgage Repayment CalculatorEstimate mortgage payments from price, deposit, rate and term.In browser