How much has the grocery shop gone up?

Food prices have risen noticeably in recent years. This calculator applies the food inflation over a period to your weekly shop to show the increase in dollars per week and per year.

What inflation rate should I use?

Use the food price inflation over the period you are looking at, from Stats NZ food price data. The calculator takes it as an input because it changes over time.

How can I cut grocery costs?

Comparing unit prices, buying specials and house brands, planning meals and reducing waste all help. The calculator shows what the rise is costing you, which is motivation to act.

Grocery Inflation Calculator

This calculator shows how much more your grocery shop costs than it used to, applying food price inflation to your weekly spend. You enter your shop and the period, and it shows the increase in dollars, putting a real figure on the rising cost of the weekly shop.

Your weekly grocery spend

Food inflation over the period

Was the spend at the start or now?

extra your weekly shop costs due to inflation

Then$0

Now$0

Extra per year$0

Enter the food price inflation over the period from Stats NZ food price data. The calculator shows the same basket at the higher prices, in dollars per week and per year, to put the rise in real terms. Estimate only.

How it works

The calculator applies the food inflation over your chosen period to your weekly shop. If your figure is the spend at the start, it grows it by inflation to show what the same basket costs now. If your figure is your spend now, it works backward to what it cost before. Either way it shows the extra per week and per year, turning an abstract inflation rate into a real number for your budget.

Worked example

A $250 weekly shop with 20% food inflation since now costs about $300, an extra $50 a week, or roughly $2,600 a year for the same groceries. Seeing that figure is often the push to compare prices and cut waste.

Related calculators

Grocery Unit Price Calculator: value at the shelf.
Grocery Budget Calculator: plan a grocery budget.
Inflation Pay Gap Calculator: has pay kept up?
Budget Calculator: household budget.

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