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Langmuir Single Layer Surface Coverage

Solve equilibrium coverage, pressure or adsorption constant for a single-class monolayer adsorption model.

Calculator inputs

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Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

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At K = 0.01 Pa⁻¹ and pressure 100 Pa, KP is one, so half the sites are occupied: θ = 0.5, or 50%.

θ = KP/(1 + KP); coverage percent = 100θ.

Enter these known values and leave the other values blank.

The model assumes identical independent adsorption sites, one molecule per site, equilibrium and no lateral adsorbate interactions.
K is entered in reciprocal pascals. Pressure unit changes convert P internally to pascals; do not rescale K to the displayed pressure unit.
Positive finite K and P give strictly 0 < θ < 1. Zero and full coverage are excluded from finite inverses in this tool.

Reciprocal pascals, so KP is dimensionless when internal pressure is in pascals.

Enter K and a fractional coverage strictly between zero and one.

Declare the physical or stated approximation domain; captured arithmetic is unchanged.