Temperature Converters

Convert between temperature units used in chemistry: Celsius, Fahrenheit, Kelvin, and Rankine. Essential for thermochemistry and gas law calculations.

Temperature conversions are fundamental in chemistry. Most lab protocols use Celsius, thermodynamic equations require Kelvin, and some industrial or legacy references report Fahrenheit. Unlike other unit conversions, temperature conversions are non-linear — they involve both multiplication and an offset, so a simple conversion factor won't work.

16 Temperature Conversions

Celsius to Delisle Converter

°De = (100 − °C) × 3/2

Convert Celsius to Delisle using °De = (100 − °C) × 3/2. Useful any time a historical inverted temperature scale that ran backwards from boiling water down to freezing have to agree.

Celsius to Fahrenheit Converter

°F = (°C × 9/5) + 32

Convert Celsius to Fahrenheit using °F = (°C × 9/5) + 32. It's the one that turns up any time a protocol written in one scale has to meet a dial labeled in the other.

Celsius to Kelvin Converter

K = °C + 273.15

Convert Celsius to Kelvin by adding 273.15. The one-step move that every gas-law, thermodynamic, or kinetic calculation assumes you've already made.

Celsius to Newton Scale Converter

°N = °C × 33/100

Multiply Celsius by 33/100 to land on the Newton temperature scale. Newton proposed it around 1701; it surfaces today only in historical thermometric texts and the occasional puzzle.

Celsius to Rankine Converter

°R = (°C + 273.15) × 9/5

Convert Celsius to Rankine using °R = (°C + 273.15) × 9/5. The absolute-scale bridge between metric thermodynamics and the English-units tradition US process engineering still lives in.

Delisle to Celsius Converter

°C = 100 − (°De × 2/3)

Convert Delisle to Celsius via °C = 100 − (°De × 2/3). Used at the handoff between inverted-zero 18th-century Russian thermometric records into modern Celsius.

Fahrenheit to Celsius Converter

°C = (°F − 32) × 5/9

Convert Fahrenheit to Celsius using °C = (°F − 32) × 5/9. The step for translating US industrial temperature specs into the unit the rest of chemistry actually uses.

Fahrenheit to Kelvin Converter

K = (°F − 32) × 5/9 + 273.15

Convert Fahrenheit to Kelvin using K = (°F − 32) × 5/9 + 273.15. The two-jump conversion that takes a Fahrenheit reading into the absolute temperature most chemistry calculations require.

Fahrenheit to Rankine Converter

°R = °F + 459.67

Convert Fahrenheit to Rankine by adding 459.67. The pure offset step that lifts a Fahrenheit reading onto its absolute-temperature counterpart.

Kelvin to Celsius Converter

°C = K − 273.15

Convert Kelvin to Celsius by subtracting 273.15. The step that turns a thermodynamic calculation result back into a practical bench temperature.

Kelvin to Fahrenheit Converter

°F = (K − 273.15) × 9/5 + 32

Convert Kelvin to Fahrenheit in two steps: subtract 273.15 to get Celsius, then multiply by 9/5 and add 32. The two-jump conversion for sharing thermodynamic results in the US-customary scale.

Kelvin to Rankine Converter

°R = K × 1.8

Convert Kelvin to Rankine by multiplying by 1.8. The pure-scaling step between the two absolute temperature scales chemistry and US thermodynamic engineering use.

Newton Scale to Celsius Converter

°C = °N × 100/33

Convert Newton-scale degrees to Celsius by multiplying by 100/33. A unit step between Newton's 1701 thermometric scale into the modern Celsius axis.

Rankine to Celsius Converter

°C = (°R − 491.67) × 5/9

°C = (°R − 491.67) × 5/9. That subtraction-and-scaling pulls a US-tradition absolute temperature back into the Celsius scale chemistry actually calculates in.

Rankine to Fahrenheit Converter

°F = °R − 459.67

Convert Rankine to Fahrenheit by subtracting 459.67. The offset is the Fahrenheit value of absolute zero — 0 °R = −459.67 °F.

Rankine to Kelvin Converter

K = °R / 1.8

Convert Rankine to Kelvin by dividing by 1.8. The clean rescaling step between two absolute scales — both anchored at absolute zero, just with different-sized degrees.

Frequently Asked Questions

Why does chemistry use Kelvin instead of Celsius?

Kelvin is an absolute temperature scale starting at absolute zero (0 K = -273.15°C). Gas law equations like PV = nRT require absolute temperature because they describe proportional relationships — doubling the Kelvin temperature doubles the pressure or volume. Celsius has an arbitrary zero point (the freezing point of water) that would break these proportionalities.

What is standard temperature in chemistry?

Standard temperature depends on context. For standard temperature and pressure (STP) in gas calculations, it is 0°C (273.15 K). For standard thermodynamic conditions, it is 25°C (298.15 K). Always check which convention your textbook or problem set uses.

How do I convert between Celsius and Kelvin?

Add 273.15 to a Celsius value to get Kelvin: K = °C + 273.15. Subtract 273.15 from Kelvin to get Celsius: °C = K - 273.15. The degree size is identical — only the zero point differs.