Retirement Calculator
Estimate your retirement pot from your current savings and monthly contributions, and the income it could provide.
Last reviewed July 1, 2026
Simplified nominal projection — excludes inflation, tax, and state/workplace pensions.
Retirement can feel abstract until you see the numbers. This calculator projects how large your retirement pot could grow between now and the age you plan to stop working, based on what you've already saved and what you add each month.
It then applies a sustainable withdrawal rate to estimate the annual income that pot might provide — a useful reality check on whether you're on track, or need to save more or work a little longer.
How the projection works
Your current savings and monthly contributions are grown at your assumed annual return up to your retirement age, using monthly compounding. The result is your projected pot in nominal terms.
To estimate income, the calculator applies a withdrawal rate you choose. The often-cited '4% rule' suggests withdrawing about 4% of the pot in the first year and adjusting for inflation after — a rough guide, not a guarantee, and one that assumes a diversified portfolio and a typical retirement length.
Important caveats
This is a simplified projection. It doesn't model inflation eroding your income, taxes, state or workplace pensions, or the sequence of market returns — all of which matter in real life.
Treat it as a directional tool: it's excellent for seeing whether saving more, retiring later, or earning a slightly higher return meaningfully changes your outcome. For a formal plan, speak to a qualified financial adviser.
Frequently asked questions
▶How much do I need to retire?
A common rough rule is 25× your desired annual spending (the inverse of a 4% withdrawal rate). This calculator estimates the pot you're on track to build and the income it could support so you can compare against your target.
▶What is the 4% rule?
It's a guideline suggesting you can withdraw about 4% of your retirement pot in year one, then adjust for inflation, with a reasonable chance the money lasts ~30 years. It's a starting point, not a promise.
Related calculators
Project how regular monthly investing plus an expected return builds wealth over time.
Open calculator →See how a lump sum plus optional regular deposits grows over time with compound interest.
Open calculator →Find out exactly how much to save each month to reach a target amount by a set date.
Open calculator →Disclaimer: Retirement Calculator results are estimates for general information and education only, and are not financial, tax, legal or medical advice. Verify important decisions with a qualified professional.