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Temperature is one of the most frequently converted measurements in daily life — from checking whether a recipe calls for 180°C or 350°F, to understanding a weather forecast in an unfamiliar unit, to performing precise scientific calculations in Kelvin. Our temperature converter handles all four major scales simultaneously: Celsius (the global scientific and everyday standard), Fahrenheit (predominant in the United States), Kelvin (the SI base unit used in physics and chemistry), and Rankine (the absolute scale used in certain engineering applications). Enter a value in any field and all three others update instantly — no formula memorisation required.

Temperature conversion is often needed alongside other unit conversions. If you are working with a recipe that mixes metric and imperial measurements, our comprehensive Unit Converter handles length, weight, volume and speed alongside the temperature work — making it your single destination for any measurement challenge. For cooking applications specifically, converting oven temperatures precisely can be the difference between a perfect bake and a disappointing result.

For those tracking fitness and caloric intake, it is worth noting that temperature — specifically body temperature and climate conditions — directly influences your daily calorie expenditure. Our Calorie Calculator takes activity level into account, and on very hot or very cold days your body burns additional energy maintaining its core temperature — a nuance that serious athletes and nutritionists often factor into their planning.

The three major temperature scales explained

Celsius (°C) was defined by Anders Celsius in 1742, with 0° as the freezing point of water and 100° as the boiling point (at standard atmospheric pressure). It is the world standard for everyday use and scientific work outside the US. Fahrenheit (°F) was proposed by Daniel Gabriel Fahrenheit in 1724, originally using body temperature (96°F) and a salt-ice brine mixture as reference points. Today it remains the everyday scale in the United States and a few other countries. Kelvin (K) is the SI base unit for thermodynamic temperature, starting at absolute zero — the theoretical point at which all molecular motion ceases (−273.15°C). Kelvin is used exclusively in physics, chemistry and engineering for thermodynamic calculations where negative temperatures are meaningless.

Temperature reference points everyone should know

Key temperatures in both scales: human body temperature 37°C / 98.6°F; fever threshold 38°C / 100.4°F; room temperature 20–22°C / 68–72°F; water freezes at 0°C / 32°F; water boils at 100°C / 212°F; oven temperatures typically 160–220°C / 320–430°F. Understanding these anchors makes foreign recipes and medical information immediately understandable. Pair with our Unit Converter for all other measurement conversions.