Money calculators

Three quick ways to see what time does to your cash. The default inflation rate is 9%, Grow I|O's working assumption for real purchasing-power loss. Official CPI is lower; change the rate to test your own view.

1. What will my money buy later?

Amount ($) Yearly loss of purchasing power (%) Years

2. The two clocks (Rule of 72)

What your savings account pays (APY %) Yearly loss of purchasing power (%)

3. What is idle cash costing me?

Cash sitting in checking or savings ($) What it earns (APY %) Yearly loss of purchasing power (%)

Want your cash doing more than one job?

Grow I|O's free guide explains how some families build a private reserve they can borrow against.

Get Build Your Own Bank: The Blueprint

Illustrations only. These calculators use simple compound math and do not predict any outcome.