What does inflation do to savings?

Inflation erodes the buying power of money over time. If your savings earn less than the inflation rate, they grow in dollars but shrink in what they can actually buy. This calculator shows the future balance in today's dollars so you can see the real change.

How do I keep ahead of inflation?

Your savings need to earn at least the inflation rate after tax just to hold their value. Beating it usually means accepting some investment risk; cash and low-rate accounts often lose value in real terms once tax and inflation are counted.

What is a real return?

The real return is your interest rate minus inflation, roughly. If you earn 4% and inflation is 3%, your real return is about 1%. A negative real return means your money is losing buying power even as the balance grows.

Inflation-Adjusted Savings Calculator

This New Zealand calculator shows what your savings will be worth in today's dollars after inflation. Your balance can grow in dollar terms yet lose buying power if it earns less than inflation. You enter your balance, the interest rate, inflation and a time frame, and the tool shows the future balance, its value in today's money, and whether your savings are getting ahead or quietly going backwards.

Savings balance

Interest rate (after tax)

Inflation

Years

value in today's dollars after inflation

Future balance (dollars)$0

Real change$0

Real return per year0%

Use an after-tax interest rate for the truest picture. A real value below your starting balance means your savings are losing buying power despite a growing dollar balance. Estimate only, not financial advice.

How it works

The calculator grows your balance at the interest rate for the years, then discounts that future balance back by inflation to express it in today's dollars. The real change is the difference between that and your starting balance, and the real return per year is roughly the interest rate minus inflation. It reveals whether your savings are genuinely growing or just keeping up with, or falling behind, rising prices.

Worked example

$50,000 earning 3% after tax for 10 years grows to about $67,200 in dollars, but with 2.5% inflation that is only about $52,500 in today's money, a real gain of just $2,500. A lower rate would leave you going backwards in real terms.

Related calculators

Real Return Calculator: return after tax and inflation.
Inflation Calculator: effect of inflation.
Savings Calculator: regular saving.
Term Deposit Calculator: term deposit returns.

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