Compound Interest Calculator
Guide: How Loan Payments Are Calculated (With a Worked Example)
- Final balance
- $144,572.72
- Total you put in
- $58,000.00
- Interest earned
- $86,572.72
Year by year
| Year | You put in | Interest | Balance |
|---|---|---|---|
| 1 | $12,400.00 | $801.42 | $13,201.42 |
| 2 | $14,800.00 | $1,834.27 | $16,634.27 |
| 3 | $17,200.00 | $3,115.28 | $20,315.28 |
| 4 | $19,600.00 | $4,662.39 | $24,262.39 |
| 5 | $22,000.00 | $6,494.83 | $28,494.83 |
| 6 | $24,400.00 | $8,633.24 | $33,033.24 |
| 7 | $26,800.00 | $11,099.74 | $37,899.74 |
| 8 | $29,200.00 | $13,918.03 | $43,118.03 |
| 9 | $31,600.00 | $17,113.55 | $48,713.55 |
| 10 | $34,000.00 | $20,713.58 | $54,713.58 |
| 11 | $36,400.00 | $24,747.34 | $61,147.34 |
| 12 | $38,800.00 | $29,246.20 | $68,046.20 |
| 13 | $41,200.00 | $34,243.79 | $75,443.79 |
| 14 | $43,600.00 | $39,776.14 | $83,376.14 |
| 15 | $46,000.00 | $45,881.93 | $91,881.93 |
| 16 | $48,400.00 | $52,602.60 | $101,002.60 |
| 17 | $50,800.00 | $59,982.60 | $110,782.60 |
| 18 | $53,200.00 | $68,069.60 | $121,269.60 |
| 19 | $55,600.00 | $76,914.70 | $132,514.70 |
| 20 | $58,000.00 | $86,572.72 | $144,572.72 |
Nothing you enter or choose here leaves your device. This tool runs in your browser.
How to use
- 1Enter your starting amount and how much you add each month.
- 2Set the yearly interest rate and the number of years.
- 3Choose how often interest is added, and whether deposits go in at the start or end of each month.
- 4Read the final balance, the interest earned and the year-by-year breakdown.
Frequently asked questions
What is compound interest?
Interest earned on both your original money and on the interest it has already earned. Over many years this snowballs, which is why starting early and adding regularly matters so much.
How does compounding frequency change the result?
The more often interest is added, the more you earn, but the difference is small. For example, 5% for 10 years on 10,000 grows to about 16,289 with yearly compounding and 16,470 with monthly compounding.
Is this a prediction of my investment returns?
No. It assumes a steady rate every year. Real investments go up and down, fees and taxes reduce returns, and past results don't guarantee future ones. Use it to compare scenarios, not to forecast.
Does it account for inflation?
No. To see growth in real terms, subtract the expected inflation rate from your interest rate and use the result.
Read the guides
Learn how this works and how to get the most from it.
Money, health & time
How Loan Payments Are Calculated (With a Worked Example)
See the formula behind a monthly loan payment, how interest and principal split over time, and how extra payments save money.
1 min read
Money, health & time
Compound Interest Explained: How Money Grows Over Time
What compound interest is, how the formula works, why compounding frequency matters, and how the Rule of 72 gives a quick estimate.
1 min read
Money, health & time
Savings Goals and Inflation: Planning Money That Keeps Its Value
How to work out how long a savings goal takes, how much to save each month, and how inflation quietly shrinks what your money can buy.
1 min read
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