How does the Pension Gap Calculator work?

Target = Annual income × 25 (4% rule) Then: Project current pot: FV = PV × (1+r)^n Then: Gap = Target − Projected Then: Monthly top-up uses future value annuity formula.

Can you give an example of how to use the Pension Gap Calculator?

Example: Input Current £60k, target £600k, 25yr, 5% growth gives a result of Projected £203k; Gap £397k; need ~£700/mo extra.

Is the Pension Gap Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Pension Gap Calculator?

Our Pension Gap Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Pension Gap Calculator

Current Pension Pot ($)

Target Retirement Pot ($)

Current Age

Retirement Age

Annual Growth Rate (%)

A pension gap calculator compares your projected retirement pot to your target, showing the monthly extra contribution needed to close the shortfall.

Symbol	Name	Unit	Description
Target	Desired annual retirement income	Currency	—
Projected	Expected pension + Social Security	Currency annually	—
Gap	Annual shortfall	Currency	—
Years	Years to retirement	Integer	—

Annual income	Pot needed (25×)
£15k	£375k
£25k	£625k
£40k	£1M
£60k	£1.5M

References

›Pension planning — MoneyHelper

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Pension Gap Calculator

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Pension Gap Calculator