Compound Interest Calculator
💷 Money & growth. Use the Compound interest formula to find final amount, amount invested p, rate, years: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Final amount | £ |
| Amount invested P | £ |
| Rate | % per year |
| Years | no unit |
Worked example
Find the final amount when Amount invested P = 1000 £, Rate = 5 % per year, Years = 3.
Using A = P(1 + r/100)ⁿ: Final amount = 1157.6 £.
Frequently asked questions
What is the formula for Compound interest?
A = P(1 + r/100)ⁿ.
What do the letters stand for, and what units are used?
Final amount in £, Amount invested P in £, Rate in % per year, Years.
How do you calculate final amount?
Put the values into A = P(1 + r/100)ⁿ. For example, with Amount invested P = 1000 £, Rate = 5 % per year, Years = 3, final amount = 1157.6 £.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (final amount, amount invested p, rate, years) and fill in the others: it rearranges the formula for you.
