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Rule of 115 Tripling Time Calculator

Approximate years for an investment to triple.

Estimate the years it takes for an investment to triple at a given annual return using the rule of 115 (years ≈ 115 / rate %), and compare with the exact value from compound interest.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

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Results

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Approx years = 115 / r. Exact years = log(3) / log(1 + r/100).

In depth

Estimate the years it takes for an investment to triple at a given annual return using the rule of 115 (years ≈ 115 / rate %), and compare with the exact value from compound interest.