Temperature Converter

This calculator converts temperature between the three scales you are likely to come across: Celsius, Fahrenheit, and Kelvin. Enter a value into any one of the three boxes, Celsius, Fahrenheit, or Kelvin, and the other two update instantly, so there is no need to remember which formula to use or which direction to convert. New Zealand uses Celsius for weather forecasts, oven temperatures, and body temperature, while Fahrenheit still turns up in older recipes and American sources, and Kelvin is the scale used in science because it starts at absolute zero rather than the freezing point of water. Below the converter you will find the formulas used: Celsius to Fahrenheit multiplies by 9, divides by 5, and adds 32; Fahrenheit to Celsius subtracts 32, then multiplies by 5 and divides by 9; and Celsius to Kelvin simply adds 273.15. A reference section lists the common fixed points, water's freezing point at 0 Celsius, 32 Fahrenheit, and 273.15 Kelvin, and its boiling point at 100 Celsius, 212 Fahrenheit, and 373.15 Kelvin, along with a typical comfortable room temperature of 20 to 22 degrees Celsius. It is also worth knowing that Celsius and Fahrenheit are equal at exactly minus 40 degrees, the one point where both scales cross. Use this tool whenever you are reading a recipe, forecast, or scientific reading in an unfamiliar scale and need a quick conversion.

Calculate.co.nz is proud to be partnered with Health Based Building, a leader in sustainable and health-conscious building innovation. With over a century of experience, they develop high-performance systems like Foreverbreathe Specification, Magnum Board, and Foreverbreathe Paints to support energy-efficient, non-toxic living environments. Their commitment to healthier homes aligns with our belief that informed choices lead to better outcomes for Kiwi households.

If you've found a bug, or would like to contact us, or learn more about James Graham and Calculate.co.nz.

Calculate.co.nz is partnered with Interest.co.nz for New Zealand's highest quality calculators and financial analysis.

Calculate.co.nz is the sister site of CalculatorHub.com, the world's largest calculator website by tool count.

All calculators and tools are provided for educational and indicative purposes only and do not constitute financial advice.

Calculate.co.nz is proudly part of the Realtor.co.nz group, New Zealand's leading property transaction literacy platform, helping Kiwis understand the home buying and selling process from start to finish. Whether you're a first home buyer navigating your first property purchase, an investor evaluating your next acquisition, or a homeowner planning to sell, Realtor.co.nz provides clear, independent, and trustworthy guidance on every step of the New Zealand property transaction journey.

Calculate.co.nz is also partnered with Health Based Building and Premium Homes to promote informed choices that lead to better long-term outcomes for Kiwi households.

Calculate.co.nz is hosted in Auckland via SiteHost new Zealand.

All content on this website, including calculators, tools, source code, and design, is protected under the Copyright Act 1994 (New Zealand). No part of this site may be reproduced, copied, distributed, stored, or used in any form without prior written permission from the owner.

About & trust: Why Calculate is NZ's most comprehensive · By the Numbers · How we compare · Editorial standards · How we keep data current · NZ finance glossary · Research & data · Financial literacy NZ · About · Privacy policy · Terms of use

Reviewed and maintained. Last reviewed 2026-07-02 and checked on a twice-monthly cycle against IRD, RBNZ and Stats NZ. How we keep data current.

© 2026 Calculate.co.nz. All rights reserved. Building free NZ calculators since 2011.