Investment Return Calculator
Work out the future value of a lump sum plus regular monthly investing at an expected annual return, after platform and fund fees.
Calculate investment return
What is this calculator?
This calculator shows how savings or investments grow over time through compound interest. Enter a starting amount, a monthly contribution, the expected annual return and the term.
Use it for a savings account, Cash ISA, stocks and shares ISA, fund or pension pot – any place your money earns a return that is reinvested.
How to use this calculator
- Enter the required details in the form above.
- Click the “Calculate” button.
- Review the results and compare your options.
- Download the result as CSV or share it as a link.
Frequently asked questions – Investment Return Calculator
The calculator uses standard financial formulas – the annuity (PMT) formula for loans and the compound interest formula for savings. Results are indicative; a lender's or creditor's final figure may differ slightly, for example because of rounding conventions.
Yes. Every calculator on InterestCalc.co.uk is completely free, with no sign-up or registration. You can use it as many times as you like.
Your calculations are saved only in your own browser (local storage) so you can come back to them. Nothing is sent to a server or shared with third parties.
Yes. There's a “Share result” button that creates a link to your calculation, and you can export a repayment schedule as a CSV file for Excel.
A lender's final offer can include individual terms – a personal rate, fees or a rate cap – that a general calculator can't know. Use the result as an indicative comparison figure and always ask the lender for a written quotation.