Retirement Fund Target Calculator

Target 500,000 in 25 years, current pot 50,000, 6% expected return: required monthly about 412. Current pot grows to 215,000 alone, leaving 285,000 gap to fill with new contributions. Larger current pot or higher return dramatically reduces required savings.

A worked example

Try the defaults: retirement target of 500,000, years to retirement of 25, current pot of 50,000, expected return of 6%. The tool returns 411.85. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.

What moves the number most

The result responds to Retirement Target, Years to Retirement, Current Pot, and Expected Return. The rate and the time horizon usually dominate — compounding means a small change in either reshapes the final figure more than a similar shift in contribution size. Test this by doubling one input at a time.

The formula behind this

Future value of current pot projected; gap filled by monthly contributions. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.

How to use this beyond the first run

Re-run the calculation once a year. Life changes — pay rises, new expenses, interest-rate shifts — and the figure that looked right 12 months ago often isn't today. Annual recalibration keeps the plan honest.

What this doesn't capture

The calculation assumes a steady savings rate and a stable interest rate. Real saving journeys include emergencies, windfalls, and rate changes — especially in easy-access products. The figure is a direction of travel, not a guarantee.

Realistic scenarios where this metric matters

This calculator is most relevant when you have a specific retirement target in mind and want to understand the monthly commitment required to reach it. Common situations include:

• Planning a transition from full-time work with a known date and savings goal
• Inheriting money and calculating how much additional monthly saving is still needed
• Testing how a change in expected return — from switching investment type, for example — alters the monthly figure
• Comparing two different retirement dates and seeing how years gained or lost affect the monthly requirement

What the result shows and what it omits

The calculator outputs a single monthly contribution amount. It shows the arithmetic bridge between where you are now and where you aim to be. What it does not model includes:

• Inflation and changes in the purchasing power of your target amount
• Tax on investment returns or on withdrawals in retirement
• One-off contributions, bonuses, or windfalls beyond the stated monthly amount
• Fees, charges, or platform costs that may reduce actual returns
• Lifestyle changes, career breaks, or periods when saving pauses

Educational use

This tool illustrates how time, current savings, return assumptions, and target amount relate to one another. The output is a snapshot based on your inputs — a model, not a forecast or a binding target. Actual outcomes depend on market performance, personal circumstances, and saving behaviour over many years.