---
title: "Rule of 72 Calculator: Years to Double | MCC Solutions"
description: "Enter a rate or a number of years to see how long money takes to double, with the exact answer. Free and private."
url: "https://mcc-solutionsnj.com/bookkeeping/rule-of-72-calculator"
---

Free tool

# Rule of 72 calculator

Estimate how long it takes for money to double at a given rate.

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Yearly rate (%)

Or years you want to double in

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How it works

## How it works

**Years to double is about 72 divided by the yearly rate.** The exact figure is ln(2) divided by ln(1 + rate). Fill in either box.

FAQ

## About this calculator

**How accurate is the rule of 72?**

It is a quick estimate that works best for rates around 6% to 10%. The exact answer is shown next to it.

**Does it work for inflation or debt?**

Yes. At 3% inflation, prices double in about 24 years. A balance growing at 20% doubles in about 3.6 years.

**Does it include contributions?**

No. It treats the starting amount only.

**Is anything saved?**

No. The math runs in your browser and nothing you enter is sent to us.

**Is this tax or financial advice?**

No. It is a calculator for general information. Check the numbers against your own records, and ask an accountant before you act on them.

Related: [compound interest calculator](/bookkeeping/compound-interest-calculator), [cagr calculator](/bookkeeping/cagr-calculator). See [all free tools](/free-tools). More free tools: [Inventory turnover calculator](/bookkeeping/inventory-turnover-calculator), [Sales commission calculator](/bookkeeping/sales-commission-calculator), [Depreciation calculator](/bookkeeping/depreciation-calculator), or [see all free tools](/free-tools).

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General information, not tax or legal advice. [How we write and check our tools](/editorial-standards).

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