Antoine Equation Calculator

The Antoine equation gives water a vapour pressure of 760.086 mmHg at 100 °C, one standard atmosphere.

Substance:

Find:

Vapour pressure at a temperatureBoiling temperature at a pressure

Temperature (°C):

Vapour pressure P =

760.086369164931 mmHg

Precision

Full answer, then cut to fewer decimals (not rounded):

760.086369164931 mmHg
760.08636916493 mmHg
760.0863691649 mmHg
760.086369164 mmHg
760.08636916 mmHg
760.0863691 mmHg
760.086369 mmHg
760.08636 mmHg
760.0863 mmHg
760.086 mmHg
760.08 mmHg
760.0 mmHg

In kPa: 101.3365149 kPa
In atm: 1.000113644 atm
log₁₀ P: 2.880862944

Step-by-step solution

log₁₀ P = A − B/(C + T) = 8.07131 − 1730.63 ÷ (233.426 + 100) = 2.880862944
P = 10^2.880862944 = 760.0863692 mmHg

Antoine Equation Formula

log₁₀ P = A − B/(C + T)

P in mmHg, T in °C for the built-in constants

Worked Example

Water at 100 °C:

log₁₀ P = A − B/(C + T) = 8.07131 − 1730.63 ÷ (233.426 + 100) = 2.880862944
P = 10^2.880862944 = 760.0863692 mmHg

In atm: 1.000113644 atm · log₁₀ P: 2.880862944

GATE tip

Check the units of the given constants: mmHg with °C is the most common set, but some tables use kPa or bar and kelvin.

More Thermodynamics and Phase Equilibria Calculators

Raoult’s Law Calculator

P = x₁P₁ˢᵃᵗ + x₂P₂ˢᵃᵗ, y₁ = x₁P₁ˢᵃᵗ/P

dew point: 1/P = y₁/P₁ˢᵃᵗ + y₂/P₂ˢᵃᵗ; α = P₁ˢᵃᵗ/P₂ˢᵃᵗ

Example: A benzene–toluene liquid with 40 % benzene at 90 °C: Bubble-point pressure P = 86.96 kPa.

Open the raoult’s law calculator →
Van der Waals Equation Calculator

P = RT/(Vm − b) − a/Vm²

Tc = 8a/(27Rb), Pc = a/(27b²), Vc = 3b

Example: 1 mol of CO₂ in 1 L at 300 K: Pressure (van der Waals) P = 22.4152 bar.

Open the van der waals equation calculator →

Frequently asked questions

Why do Antoine constants come with a temperature range?

They are fitted to data over a range; outside it the error grows quickly, especially near the critical point.

How do I switch the constants to kPa and K?

For kPa subtract log₁₀(7.50062) = 0.87506 from A; for kelvin replace C with C − 273.15.

Sources

The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.

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APA

Scientific Converters. (2026, October 15). Antoine Equation Calculator. Retrieved October 29, 2026, from https://scientificconverters.com/calculators/antoine-equation-calculator/

IEEE

Scientific Converters, "Antoine Equation Calculator," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/calculators/antoine-equation-calculator/