Rule of 70
Divide 70 by the inflation rate to see how long until your money buys half as much.
6%
1%15%
11.7
years
How it works
The same maths as the Rule of 72, pointed at the thing working against you. At 6% inflation your purchasing power halves in under 12 years — which is why cash sitting in a savings account is not the safe choice it feels like.
Where it breaks down
Assumes constant inflation. Your personal inflation rate — driven by school fees, rent and medical costs — is usually higher than the headline CPI number.
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Illustrative only. These figures assume constant rates and do not predict actual returns. Markets, taxes and inflation vary. This is educational information, not financial advice — consult a SEBI-registered adviser before making investment decisions.