Worked examples
Compound Interest Examples
Use worked compound interest examples with direct calculator links for common amounts, rates, terms and monthly deposits.
Worked compound interest examples
These examples use monthly compounding and fixed annual rates. They are useful starting points for understanding how the same formula behaves with different amounts, rates, time periods and deposits.
| Example | Final balance | Interest earned | Calculator |
|---|---|---|---|
| £1,000 at 5% for 10 years | £1,647.01 | £647.01 | Open |
| £5,000 at 5% for 10 years | £8,235.05 | £3,235.05 | Open |
| £10,000 at 5% for 10 years | £16,470.09 | £6,470.09 | Open |
| £25,000 at 6% for 20 years | £82,755.11 | £57,755.11 | Open |
| £50,000 at 4% for 15 years | £91,015.08 | £41,015.08 | Open |
| £10,000 plus £250 monthly for 10 years | £55,290.66 | £15,290.66 | Open |
| £0 plus £100 monthly for 20 years | £41,103.37 | £17,103.37 | Open |
| £5,000 plus £100 monthly for 10 years | £23,763.28 | £6,763.28 | Open |
Example 1: £5,000 at 5% for 10 years
With monthly compounding, £5,000 at 5% for 10 years grows to approximately £8,235.05.
Example 2: £10,000 plus £250 per month
Adding monthly deposits changes the calculation. £10,000 plus £250 per month at 5% for 10 years grows to around £55,290.66.
Example 3: Starting from zero
Even without a starting amount, regular monthly deposits can compound. £100 per month at 5% for 20 years grows to about £41,103.37.
How to use these examples
Open the closest example in the calculator, then adjust the inputs to match your own scenario. You can change the currency symbol, compounding frequency, contribution timing, inflation adjustment, tax and fees.
Calculate it yourself
Use the free compound interest calculator to adjust the amount, rate, term, compounding frequency and regular deposits.
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