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How long money takes to double

A single number that makes compounding intuitive — and makes the cost of interrupting it obvious.

A free arithmetic tool. It is not advice, and nothing about you is being assessed.

This calculator performs arithmetic on figures you type, in your own browser. Nothing is sent, saved, stored or seen by anyone. There is no form, no submission, no account and no tracking — no mechanism exists by which your figures could reach the author or anyone else. Close the page and nothing remains.

It is not advice — financial, insurance, investment, tax or legal. It is not a needs analysis, not a suitability assessment, not a recommendation and not an offer. It models no financial product of any kind, and the rates you enter are your own assumptions, not rates offered or achievable anywhere. No determination is made about you and nothing is being sold to you on this page.

Real loans and real investments carry fees, taxes, compounding conventions, penalties and terms this simple arithmetic ignores. Treat any figure here as a rough illustration to take to your own advisers, never as a quotation, a projection or a basis for a decision. Nothing here creates a professional-client relationship.

The author accepts no responsibility for any decision made on the basis of this tool.

The Rule of 72 is a shortcut: divide 72 by the rate and you get roughly the years to double. It is an approximation, and this shows the exact figure alongside it.

The rate is yours to choose. It is not offered by anyone, not produced by any particular product, and not a forecast. Real outcomes involve taxes, fees and volatility this ignores entirely.

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A free arithmetic tool. It is not advice, and nothing about you is being assessed.

This calculator performs arithmetic on figures you type, in your own browser. Nothing is sent, saved, stored or seen by anyone. There is no form, no submission, no account and no tracking — no mechanism exists by which your figures could reach the author or anyone else. Close the page and nothing remains.

It is not advice — financial, insurance, investment, tax or legal. It is not a needs analysis, not a suitability assessment, not a recommendation and not an offer. It models no financial product of any kind, and the rates you enter are your own assumptions, not rates offered or achievable anywhere. No determination is made about you and nothing is being sold to you on this page.

Real loans and real investments carry fees, taxes, compounding conventions, penalties and terms this simple arithmetic ignores. Treat any figure here as a rough illustration to take to your own advisers, never as a quotation, a projection or a basis for a decision. Nothing here creates a professional-client relationship.

The author accepts no responsibility for any decision made on the basis of this tool.

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