Rule of 72 Calculator

If you’re not interested in doing the math in your head, this calculator will use the Rule of 72 to estimate how long a lump sum of money will take to double. Enter your data in they gray boxes. As a bonus, the Rule of 114 for tripling your money, and the Rule of 144 for quadrupling your money are included. For a more detailed compound interest calculator, with monthly investments, and daily, monthly, and annual compounding, please see The PoF Compound Interest Calculator.   Download all PoF calculators in one Excel file! You will be sent a link to the file and a confirmation to receive notifications of new posts and my quarterly progress note.

All Calculators:


card_name
Annual fee
annual_fees
Intro APR
intro_apr_rate,intro_apr_duration
Regular APR
reg_apr,reg_apr_type
Recommended credit
credit_score_needed
Bonus Intro Rewards
bonus_miles_full read more
Pg-Partnerships-PhysicianOnFire-110320-pblackowl_250
card_name
Annual fee
annual_fees
Intro APR
intro_apr_rate,intro_apr_duration
Regular APR
reg_apr,reg_apr_type
Recommended credit
credit_score_needed
Bonus Intro Rewards
bonus_miles_full read more
$50 bonus for new registrants!

Subscribe to Physician on FIRE

If you do not see a subscription box above, please navigate here to subscribe.

Join Thousands of Doctors on the Path to FIRE

Get exclusive tips on how to reclaim control of your time and finances.