justyourcalculatorInterest Calculator
How much interest your money earns, with regular deposits, tax and inflation.
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Interest Calculator
Interest earned with deposits, tax and inflation
Ending balance
$53,153.79
After 5 years
- Initial investment
- $20,000.00
- Total contributions
- $25,000.00
- Total interest
- $8,153.79
- Interest on the initial investment
- $5,525.63
- Interest on contributions
- $2,628.16
- Buying power in today's dollarsAfter 3% yearly inflation
- $45,850.92
No tax on interest assumed (for example a tax-advantaged account).
- Initial investment$20,000
- Contributions$25,000
- Interest$8,154
- Initial investment
- Contributions
- Interest
| Year | Deposits | Interest | Ending balance |
|---|---|---|---|
| 1 | $5,000.00 | $1,000.00 | $26,000.00 |
| 2 | $5,000.00 | $1,300.00 | $32,300.00 |
| 3 | $5,000.00 | $1,615.00 | $38,915.00 |
| 4 | $5,000.00 | $1,945.75 | $45,860.75 |
| 5 | $5,000.00 | $2,293.04 | $53,153.79 |
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How the interest calculator works
Interest is credited every month at the rate that matches your compounding choice: an annual rate compounded c times a year becomes (1 + r/c)^(c/12) - 1 per month. Each month's interest earns interest from then on.
Contributions are added at the start or end of each period. The annual contribution arrives once a year; the monthly one every month. Tax, if you enter a rate, is taken from the interest as it's earned.
Buying power divides the ending balance by the growth in prices: balance / (1 + inflation)^years. It shows what the money would buy in today's dollars.
Using and checking your result
Published by JustYourCalculator. Check the units and assumptions above, and compare a known example before relying on the output. Calculations use browser arithmetic and may round displayed values.
This is an educational estimate, not a lender quote, tax filing calculation or investment recommendation. Actual costs depend on current rules, fees and your circumstances. Verify important decisions with official sources and a qualified adviser.
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