Savings doubling time calculator

How long until your balance doubles.

Built and reviewed by Dovanic, Founder and editor, FreeByteLast reviewed: 2026-08-18

Annual return

Doubling time

14.2 years

Rule of 72 estimate

14.4 years

With these inputs, doubling time comes to 14.2 years. Rule of 72 estimate works out to 14.4 years. The result assumes annual return stays at 5%.

What moves the number · Doubling time

Input	−10%	Now	+10%
Annual return	15.7 years	14.2 years	12.9 years

Whatmakesequal

Save this set of inputs, change something, then save again to compare the outcomes side by side.

How long until your balance doubles.

With the defaults above, doubling time works out at 14.2 years.