How it works
Doubling time = ln(2) / ln(1 + growth/100), with a strictly positive growth rate.
Input definitions
- Growth per period (%)
- Enter the value in the labeled unit.
A worked example
- Growth per period (%)
- 10
Assumptions & limits
Uses the units and scope stated in the input labels. Results are rounded for display; verify the model is appropriate for your situation.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-18. Content checked against the stated method and examples. Our verification approach.
Common questions
Does the rule of 72 give the exact answer?
No. This uses logarithms for discrete compound growth. The rule of 72 is an approximation and can differ at high rates.
How does Exponential growth doubling time work?
Doubling time = ln(2) / ln(1 + growth/100), with a strictly positive growth rate.
What should I check before using Exponential growth doubling time?
Uses the units and scope stated in the input labels. Results are rounded for display; verify the model is appropriate for your situation.