Investment Calculators
Investment Calculator
Enter a starting balance, what you add each month and a realistic long-run return to see how the balance is expected to develop.
Projected value
$341,238
- Total invested
- $140,000
- Investment growth
- $201,238
- Growth multiple
- 2.44×
Yr 1Yr 2Yr 3Yr 4Yr 5Yr 6Yr 7Yr 8Yr 9Yr 10Yr 11Yr 12Yr 13Yr 14Yr 15Yr 16Yr 17Yr 18Yr 19Yr 20
How this calculator works
FV = P(1 + r)^n + C × [((1 + r)^n − 1) ÷ r]
- P
- the starting amount
- C
- the regular contribution
- r
- the periodic return
- n
- the number of periods
Important considerations
- Returns are assumed to be smooth; real markets are not.
- Fees, taxes and inflation all reduce the outcome.
Related calculators
- Compound Interest CalculatorProject the growth of a balance with compounding and regular contributions.
- Future Value CalculatorWhat a sum today is worth in the future.
- Investment Fee CalculatorWhat annual charges cost you over the long run.
- CAGR CalculatorCompound annual growth rate between two values.
- Retirement CalculatorProject your retirement balance and the income it could sustain.
- ROI CalculatorTotal and annualised return on any investment.
Learn more
Terms used here
Frequently asked questions
What return should I assume?
Use a conservative long-run figure and test a lower one. Small changes to the assumption compound into large differences.
Disclaimer
Legamoney calculators are educational tools. Results are estimates based on the figures you enter and do not constitute financial, tax or legal advice.
Last reviewed 2026-08-01