Compound Interest Calculator

Want to understand on how much your investment will be worth in the future? Factor in inflation with our compound interest calculator.

Use this compound interest calculator to estimate how your pot could grow over time.

Enter your current balance, set a monthly contribution, choose a time horizon, and add sensible assumptions for returns and inflation. Then hit Calculate to see a projected final value and a range for optimistic and pessimistic scenarios.

– Start with conservative assumptions, then test a few scenarios.
– Small changes to return or inflation make a big difference over long periods.
– This is a general planning tool – it’s not financial advice.

Controls how amounts are displayed (values aren't converted).
Current pot before new contributions.
Amount added at the end of each month.
Optional: raise monthly amount each year (e.g., 3%).
Time horizon (1–60 years).
How often growth is compounded.
Used to show an inflation‑adjusted (real) final value.
Best estimate for your portfolio (e.g., diversified equities).
Shows pessimistic (base−band) and optimistic (base+band) scenarios.
Future value (base)
Total invested
Total growth
Inflation‑adjusted value

Interested in Investing?