Worked examples
Compound Interest Examples
By Compound Interest Tools · Updated · Calculation method
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.
Explore different rates, longer terms and added deposits in the £5,000 growth example.
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.
The monthly deposits guide explains how contribution timing changes the result.
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.
Try solving a scenario yourself with the compound interest practice questions and worked answers.
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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