Is this a Rule of 72 calculator?

Yes. This tool includes a Rule of 72 calculator to estimate years needed to double money at a given annual return rate. It also includes Rule of 114 and 144 for tripling and quadrupling estimates.

What are Rule of 114 and Rule of 144?

Rule of 114 estimates years to triple money, and Rule of 144 estimates years to quadruple it. They are similar mental-math shortcuts based on compound growth approximations.

What is doubling time in compound interest?

Doubling time is the approximate number of years an investment takes to grow 2x under compound returns. Rule of 72 estimates it as 72 divided by annual return percentage.

Can I use this for FD, mutual fund, or stock return assumptions?

Yes. You can test expected return assumptions for FDs, mutual funds, and stocks. These are planning estimates only, not guaranteed outcomes.

Is Rule of 72 accurate for all return rates?

Rule of 72 is a useful approximation and tends to work best in common investing ranges. At very low rates, Rule of 70 or 71 may be slightly closer; for exact planning use compound-interest formulas.

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Money Growth Calculator

Find out exactly how long it takes to double, triple, or quadruple your money using the Rule of 72, 114, and 144. Enter your return rate for instant results.

New to this concept? Learn what the Rule of 72 means in finance with formula and examples.

Money Growth Calculator

See how fast your money grows

Expected Annual Return

%

Double6yearsRule of 72

Triple9.5yearsRule of 114

Quadruple12yearsRule of 144

Strong Compounding

At 12%, your money doubles every 6.0 years — excellent compounding power!

If you invest ₹100K today

After 6 yrs (Double)₹200K
After 9.5 yrs (Triple)₹300K
After 12 yrs (Quadruple)₹400K

What are the Rule of 72, 114 & 144?

These are mental-math shortcuts to estimate how long it takes for money to grow to a multiple of itself at a given compound annual return rate. They are derived from the mathematics of compound interest.

Years to double = 72 ÷ annual return (%)

Years to triple = 114 ÷ annual return (%)

Years to quadruple = 144 ÷ annual return (%)

Example at 12%: double in 6 yrs · triple in 9.5 yrs · quadruple in 12 yrs

The number 72 works because ln(2) ÷ ln(1 + r/100) ≈ 72 / r for typical return rates. Similar approximations give 114 for tripling and 144 for quadrupling.

How to use this calculator

1Enter your expected CAGR (Compound Annual Growth Rate) — this is the average annual return you expect from your investment.
2Results update instantly to show years to double, triple, and quadruple using Rule of 72, 114, and 144.
3Read the insight badge — it tells you whether your return rate is Slow, Moderate, or Strong compounding.
4Check the “If you invest” section to see the absolute currency impact over time.
5Try different rates (e.g. FD at 7%, mutual fund at 12%, equity at 15%) to compare outcomes.

Understanding growth categories

< 6%

Slow Growth

Savings account, FD

6 – 10%

Moderate Growth

Debt mutual funds, balanced funds

> 10%

Strong Compounding

Equity funds, direct stocks

Money Growth Calculator

Money Growth Calculator

What are the Rule of 72, 114 & 144?

How to use this calculator

Understanding growth categories

Rule of 72 Calculator FAQs