--- title: "Temperature Conversion Guide: Formulas, Charts & Tables | ShoutingNow" description: Convert Celsius, Fahrenheit, and Kelvin with temperature conversion formulas, charts, worked examples, and a free multi-unit temperature converter. url: "https://shoutingnow.com/guides/unit-conversion-guide/temperature-conversion/" image: "https://shoutingnow.com/wp-content/uploads/2026/07/Temperature-Conversion-Guide-Celsius-Fahrenheit-Kelvin-1024x683.webp" --- # Temperature Conversion Guide: Formulas, Charts & Tables **Temperature conversion** is the everyday math behind oven settings, weather apps, lab notes, and travel packing lists. A recipe written in Celsius, a thermostat in Fahrenheit, or a science worksheet in Kelvin all describe the same thermal state, rewritten in another scale. This guide owns the formulas, charts, and worked examples for temperature conversion, then links the free ShoutingNow temperature converter. On this page 13 1. 1 What temperature conversion is (and why scales differ) 2. 2 Plain-language temperature formulas 3. 3 Temperature conversion tables Celsius to Fahrenheit 4. Celsius to Kelvin (selected) [ 4 Worked examples ](#worked-examples) 1. Example 1, oven from a metric recipe 2. Example 2, fever check across scales 3. Example 3, lab note in Kelvin [ 5 Common temperature conversion mistakes ](#common-temperature-conversion-mistakes) [ 6 Temperature converter tools ](#temperature-converter-tools) [ 7 Related reading ](#related-reading) [ 8 Frequently asked questions ](#sn-section-faqs) Show 3 more sections **Convert temperature now:** [Open the free Temperature Converter](https://shoutingnow.com/tools/temperature-converter/), Celsius, Fahrenheit, Kelvin, and more in one place. No sign-up required. ## What temperature conversion is (and why scales differ) Temperature measures how hot or cold something is. Converting temperature rewrites that reading on another scale without changing the physical heat. Celsius and Fahrenheit are offset scales (zero is not absolute zero); Kelvin and Rankine are absolute scales used in science and engineering. You convert when a weather forecast, appliance manual, or lab protocol uses a different scale than the one you think in. Unlike length or mass, temperature conversion is not a simple multiply-by-factor for Celsius↔Fahrenheit, you must apply an offset. Absolute scales share the same degree size as their relatives (1 K = 1 °C; 1 °R = 1 °F) but start at absolute zero. ## Plain-language temperature formulas - Celsius → Fahrenheit: multiply °C by 9/5, then add 32. (°F = °C × 1.8 + 32) - Fahrenheit → Celsius: subtract 32, then multiply by 5/9. (°C = (°F − 32) × 5/9) - Celsius → Kelvin: add 273.15. (K = °C + 273.15) - Kelvin → Celsius: subtract 273.15. - Fahrenheit → Rankine: add 459.67. (°R = °F + 459.67) For which everyday contexts prefer Celsius vs Fahrenheit, history and usage, not the conversion math, see [Celsius vs Fahrenheit](https://shoutingnow.com/blog/celsius-vs-fahrenheit/). ## Temperature conversion tables ### Celsius to Fahrenheit °C °F −18 −0.4 0 32 10 50 20 68 37 98.6 100 212 180 356 ### Celsius to Kelvin (selected) °C K −273.15 0 0 273.15 25 298.15 100 373.15 ## Worked examples ### Example 1, oven from a metric recipe A baking recipe says **190 °C**. In Fahrenheit: 190 × 1.8 + 32 = **374 °F**. Round to the nearest oven mark your dial allows (often 375 °F), not before converting. ### Example 2, fever check across scales A clinic chart lists **100.4 °F**. In Celsius: (100.4 − 32) × 5/9 ≈ **38.0 °C**. Confirm the device’s scale before you compare to a home thermometer. ### Example 3, lab note in Kelvin A protocol stores a sample at **277 K**. In Celsius: 277 − 273.15 = **3.85 °C**, roughly refrigerator-cold, not freezer-cold. ## Common temperature conversion mistakes - Forgetting the +32 / −32 offset on Celsius↔Fahrenheit and treating it like a pure ratio. - Using 273 instead of 273.15 for precise Kelvin work (fine for rough estimates, not for lab write-ups). - Confusing “room temperature” conventions (often ~20-25 °C / 68-77 °F) with a single fixed value. - Mixing Rankine with Kelvin, both are absolute, but degree sizes differ (°R tracks Fahrenheit). ## Temperature converter tools Start with the multi-unit [Temperature Converter](https://shoutingnow.com/tools/temperature-converter/) for any from/to pair. ## Related reading - Celsius vs Fahrenheit, which scale people use and why (editorial; formulas stay here) - Unit conversion chart & calculator guide, map of every category guide ## Frequently Asked Questions ### How do I convert Celsius to Fahrenheit? Multiply °C by 9/5 (or 1.8) and add 32. 20 °C works out to 20 × 1.8 + 32 = 68 °F. Or just use the [Temperature Converter](https://shoutingnow.com/tools/temperature-converter/) for an instant answer. ### How do I convert Fahrenheit to Celsius? Subtract 32 from °F, then multiply by 5/9. (98.6 − 32) × 5/9 comes out to about 37 °C. ### How do I convert Celsius to Kelvin? Add 273.15 to the Celsius value, so 25 °C becomes 298.15 K. Subtract 273.15 to go the other way. ### Why isn't temperature conversion a simple multiply like length? Because Celsius and Fahrenheit start counting from different zero points, so you need an offset of ±32 on top of the scale factor. Absolute scales like Kelvin and Rankine share degree size with their relatives but begin at true absolute zero instead. ### When should I read Celsius vs Fahrenheit instead of this guide? [Celsius vs Fahrenheit](https://shoutingnow.com/blog/celsius-vs-fahrenheit/) is the place for which-system-and-why history. This page sticks to formulas, charts, and converter links. ### Is the ShoutingNow temperature converter free? It is, the Temperature Converter runs in your browser with no account needed. ```json [{"@context":"https://schema.org","@type":"Organization","name":"ShoutingNow","url":"https://shoutingnow.com/","logo":{"@type":"ImageObject","url":"https://shoutingnow.com/wp-content/themes/shoutingnow-theme/assets/images/logo.png"},"sameAs":["https://x.com/makani20","https://www.linkedin.com/in/makani20/","https://post-see.com"],"contactPoint":{"@type":"ContactPoint","contactType":"customer support","email":"support@shoutingnow.com","url":"https://shoutingnow.com/contact/"},"slogan":"Learn. Build. 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