New Zealand Inflation Calculator

The Consumer Price Index (CPI) is New Zealand's principal measure of household inflation, compiled by Stats NZ Tatauranga Aotearoa. It tracks the percentage change in the price of a basket of goods and services typically purchased by NZ households.

The CPI basket includes 598 goods and services across 11 main groups (Housing & Household Utilities, Food, Transport, etc.), classified largely on the Classification of Individual Consumption According to Purpose (COICOP). The CPI is published quarterly, typically 12 working days after the end of the reference quarter. The current series uses an index reference period of June 2017 quarter = 1000.

The annual CPI inflation rate was 4.1% in the year to the June 2026 quarter (released 21 July 2026), unchanged from December 2025. This is the second consecutive quarter at the top of the RBNZ 1–3% target band. Quarterly inflation was +0.9%, accelerating from +0.6% in Q4 2025.

The largest annual contributors were Electricity (+12.5%) - the third quarter in a row as the largest upward contributor - Local authority rates and payments (+8.8%), Meat and poultry (+8.6%), and Pharmaceutical products (+17.7%) following the prescription charge reset on 1 February 2026.

The CPI basket includes 598 items across 11 main expenditure groups. Following the 2024 review, the largest weights are:

• Housing & Household Utilities: 29.4%
• Food: 18.5%
• Transport: 14.3%
• Recreation & Culture: 9.0%
• Miscellaneous Goods & Services: 8.0%

Other categories include Alcoholic Beverages & Tobacco (7.0%), Household Contents & Services (4.0%), Health (4.0%), Clothing & Footwear (3.0%), Communication (2.0%), and Education (1.8%). Weights reflect the share of total household expenditure on each category. Stats NZ updates these weights every three years using data from the Household Economic Survey - the next review is scheduled for 2027.

Headline CPI is the total change in the basket - it includes all items, including volatile components like fuel and fresh produce.

Trimmed mean inflation excludes the largest price increases and decreases at the item level (about 700 goods and services). The standard published level is a 10% trim. By removing the most volatile movements, it shows the underlying trend.

The RBNZ publishes several core inflation measures alongside the trimmed mean: the weighted median, the factor model (a dynamic factor model on 96 of the 105 CPI classes), and the sectoral factor model (which estimates separate factors for tradable and non-tradable sectors). These help the RBNZ see through temporary spikes - like the March 2026 fuel surge from the Middle East conflict.

Stats NZ publishes the CPI quarterly (March, June, September, and December quarters), typically 12 working days after the end of the reference quarter. This timing reflects New Zealand's smaller economy and statistical resources compared with larger countries.

The quarterly approach allows Stats NZ to collect comprehensive price data from over 2,800 retail outlets across 12 pricing centres throughout the country. Some monthly indicators are published separately - including the Food Price Index and the Selected Price Indexes - but the official headline CPI remains quarterly. This provides reliable data for the RBNZ's monetary policy decisions, taken eight times per year.

Not exactly. The CPI measures price changes for a fixed basket of goods. Cost-of-living measures show the change in spending needed to maintain a given standard of living.

For example, if beef prices rise sharply, the CPI records the price change. A cost-of-living measure might allow for households substituting cheaper protein sources, and reflects actual spending including mortgage interest payments. Stats NZ publishes the Household Living-Costs Price Indexes (HLPIs) for 13 different household groups (beneficiaries, superannuitants, Māori households, low and high-income deciles, plus an all-households group). In March 2026, the HLPI rose 2.1% annually for the average household - lower than the 3.1% CPI - largely due to falling mortgage interest payments.

The Reserve Bank of New Zealand targets annual consumer price inflation between 1–3%, with a focus on the 2% midpoint. The target is set out in the Remit for the Monetary Policy Committee, agreed with the Minister of Finance.

New Zealand pioneered formal inflation targeting in 1990 - the first country in the world to do so. The 1–3% range gives the RBNZ flexibility to look through temporary price movements while maintaining medium-term price stability. The target is "flexible" - the RBNZ aims to return inflation to the midpoint over the medium term rather than at every measurement.

As at July 2026, the Official Cash Rate is 2.50%.

The RBNZ raised the OCR by 25 basis points to 2.50% on 8 July 2026 - the first increase after the easing cycle, following holds at 2.25% in February, April and May 2026. This followed an aggressive easing cycle: the OCR was cut from a peak of 5.50% (May 2023) down to 2.25% by November 2025, reducing rates nine times as inflation came back within the target band. Governor Anna Breman noted in April that the Committee discussed raising rates as an option, with the commentary described as hawkish. Cuts were not discussed.

In July the RBNZ noted that ongoing effects from the Middle East conflict will keep inflation elevated in the near term, that recent falls in fuel prices lower costs and support the economic recovery, and that it will adjust interest rates to ensure inflation returns to 2%. The next OCR decision is the Monetary Policy Review on 28 October 2026, with the next full Monetary Policy Statement on 9 December 2026.

The RBNZ's primary tool is the Official Cash Rate (OCR) - the interest rate on overnight settlement accounts that registered banks hold at the Reserve Bank. When inflation is too high, the RBNZ raises the OCR. Higher rates make borrowing more expensive, reduce household and business spending, slow demand, and ease price pressures.

When inflation is too low, the RBNZ lowers rates to encourage spending. Changes in the OCR flow through to floating mortgage rates, term deposit rates, and the New Zealand dollar exchange rate. The Monetary Policy Committee reviews the OCR eight times per year - this expanded from seven decisions per year for 2027 onwards.

Headline inflation has remained at 3.1% for two consecutive quarters (Q4 2025 and Q1 2026), at the top of the RBNZ's 1–3% target band. The RBNZ's April 2026 update raised its near-term inflation forecast: CPI is now projected at 4.2% in Q2 2026, lifted by higher oil prices following the Middle East conflict.

The RBNZ stated it stands ready to act decisively to ensure inflation returns to the 2% midpoint over the medium term. The Committee discussed raising the OCR as an option in April but decided to hold while assessing how higher fuel costs balance against weaker domestic growth. It then raised the OCR by 25 basis points to 2.50% on 8 July 2026 and by a further 25 basis points to 2.75% on 2 September 2026; the next decision is the Monetary Policy Review on 28 October 2026.

The OCR sets the floor for short-term wholesale funding rates that banks use to price floating and fixed mortgages. When the RBNZ raises the OCR, lenders typically increase floating mortgage rates by a similar amount, lifting monthly repayments. Conversely, rate cuts reduce repayments.

Most New Zealand mortgages are on fixed terms (one to five years), so the impact of OCR changes flows through gradually as fixed terms expire and households roll onto new rates. The OCR cuts since August 2024 (from 5.50% down to 2.25%) have been progressively passing through, helping reduce household debt servicing costs - a key reason the HLPI for the average household has run below headline CPI in early 2026.

Housing & Household Utilities (29.4% of CPI) is the largest contributor to inflation. In the year to March 2026:

• Electricity (+12.5%): the third consecutive quarter as the single largest upward contributor to annual CPI - reflecting transmission and distribution cost increases and wholesale electricity prices.
• Local authority rates and payments (+8.8%): contributing 8.7% to the headline 3.1% annual rate, reflecting councils' infrastructure, debt servicing, and water/wastewater costs.
• Rent (+1.2%): contributing 4.6% to headline inflation, but moderating from a peak above 4% as net migration eased and rental supply increased.

Transport prices rose 3.3% in the year to March 2026, up from 2.6% in December 2025. The acceleration was driven primarily by petrol (+3.5% quarterly) - with the bulk of the increase concentrated in March 2026 due to global supply disruptions caused by the Middle East conflict.

Petrol is the third-largest expense item for New Zealand households, after rent and construction, accounting for around 3.5% of typical household spending. Combined with pharmaceutical products (+17.7% from the prescription charge reset), petrol and pharmaceuticals accounted for more than a quarter of the 0.9% quarterly CPI increase. Excluding petrol, the CPI rose 0.8% in the quarter.

Food prices rose 4.0% in the year to March 2026 - the largest contributor to headline inflation after housing. Key drivers include:

• Meat and poultry (+8.6%): contributing 6.4% to headline inflation, reflecting strong global demand for New Zealand red meat.
• Fruit and confectionery, nuts and snacks: large contributors to the quarterly increase.
• Vegetables: typically the most volatile food sub-group, with seasonal weather events affecting supply.

Food makes up 18.5% of the CPI basket - the second largest category after Housing.

Inflation erodes the real value of money. If a savings account earns 4% interest while inflation is 3.1%, the real return is positive but only about 0.9% per year. If the interest rate is below inflation, purchasing power decreases over time.

To preserve purchasing power, returns must exceed the inflation rate (a positive "real return"). Some assets - including shares, property, and inflation-linked bonds - have historically offered some inflation protection. KiwiSaver returns are typically reported in nominal terms; over the long run, returns net of fees and tax need to exceed inflation to grow real wealth. The recent OCR cuts have lowered term deposit rates, narrowing the real return on cash savings.

NZ Superannuation and main benefit rates are adjusted annually on 1 April using CPI inflation. The adjustment uses the percentage change in the CPI between the December quarter of the previous year and the December quarter before that.

For example, the 1 April 2026 adjustment used the CPI change between December 2024 (1276.5) and December 2025, which was approximately 3.1%. NZ Super must also remain between 66-72.5% of the average ordinary-time weekly wage (net of tax) for a married couple - this "wage floor" provides additional protection during high-inflation periods. Benefits are adjusted similarly using CPI to ensure recipients maintain purchasing power.

An inflation calculator helps illustrate how the value of money has changed over time. Common uses include:

• Calculating what an item that cost NZD 100 in 1990 would cost today, adjusted for inflation.
• Estimating how much a salary needs to increase to maintain the same purchasing power.
• Understanding the real value of historical prices when reading historical financial information.

The Money Snap calculator above uses official Stats NZ CPI data covering 99 years (1926-2025) - one of the longest continuous CPI series in the Asia-Pacific region.