Skip to content
ToolQivo

Temperature Calculator

Convert Celsius, Fahrenheit and Kelvin with the formulas shown.

Calculators Reviews Free · no sign-up

Type into any scale — the others convert instantly.

Why temperature is the one people get wrong

Unlike length or weight, the scales have different zero points as well as different degree sizes, so a conversion needs an offset and a multiplication. Skipping either half gives an answer that looks plausible and is wrong.

Reference points

Point°C°F

Quick Tool Overview

The Temperature Calculator converts between Celsius, Fahrenheit, Kelvin and Rankine at once, with the conversion formula printed beneath so you can follow the arithmetic rather than just take the number. Temperature is the conversion people most often get wrong.

What it does
Converts temperature between four scales
You give it
A temperature in any scale
You get back
The other three scales plus the formula used
Best for
Cooking, weather, science, medicine and travel
Calculators Free, unlimited use No sign-up Runs in your browser

About the Temperature Calculator

Type a temperature in any scale and see it in Celsius, Fahrenheit, Kelvin and Rankine at once, with the conversion formula printed beneath so you can follow the arithmetic rather than just take the number.

Temperature is the conversion people most often get wrong, because unlike length or weight it needs an offset as well as a scale factor. Celsius to Fahrenheit is multiply by 9/5 then add 32, and skipping either half gives an answer that looks plausible but is wrong. A reference table of familiar points sits below the converter — freezing, body temperature, a fever threshold, oven settings and absolute zero — for sanity-checking a result at a glance.

Key features of the Temperature Calculator

Formulas shown

Celsius to Fahrenheit is multiply by 9/5 then add 32, and skipping either half gives a plausible but wrong answer.

Four scales at once

Celsius, Fahrenheit, Kelvin and Rankine from a single entry.

Offset handled properly

Unlike length or weight, temperature needs an offset as well as a scale factor, which this conversion applies correctly.

Reference points table

Freezing, body temperature, a fever threshold, oven settings and absolute zero for sanity-checking a result at a glance.

Negative values fine

Sub-zero temperatures convert correctly in every direction.

How to use the Temperature Calculator

  1. 1

    Enter a temperature

    Type into whichever scale you have and the others convert instantly.

  2. 2

    Read the formula

    The conversion used is shown with the result so you can check or reuse it.

  3. 3

    Compare against the reference

    Common temperatures are listed below to sanity-check your answer.

Frequently asked questions

Multiply by 9/5, then add 32. So 20 degrees Celsius is 20 x 1.8 = 36, plus 32, which is 68 degrees Fahrenheit.

Reviews of the Temperature Calculator

What people who use the Temperature Calculator think of it. Reviews come from visitors and are posted as written.

No ratings yet

Yours would be the first.

  • 5 0 reviews rated 5 stars
  • 4 0 reviews rated 4 stars
  • 3 0 reviews rated 3 stars
  • 2 0 reviews rated 2 stars
  • 1 0 reviews rated 1 star

Write a review

Used this tool? Your rating helps the next person decide.

Your rating

Plain text only — links, email addresses and HTML are not accepted. Your name and review are shown publicly; nothing else is collected. See the privacy policy.

0 reviews

Newest first

No reviews yet

Be the first to rate the Temperature Calculator. It takes half a minute and no account.

Write the first review

More calculators