Last reviewed: May 8, 2026

Interactive Analysis Tools

Porosimetry Calculators

Essential calculation tools for pore structure analysis. Convert between units, calculate pore sizes from pressure data, determine surface areas, and validate bubble points — all based on industry-standard equations and ISO/ASTM methodologies.

Washburn Pore Size Calculator (MIP)

Calculate pore diameter from mercury intrusion pressure using the Washburn equation

Washburn Equation

d = |4γ cos θ / P|

Where:
d = pore diameter (μm)
γ = surface tension (mN/m)
θ = contact angle (degrees)
P = pressure (MPa)

CALCULATED PORE DIAMETER

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BET Surface Area Calculator

Calculate specific surface area from monolayer capacity and adsorbate properties

BET Equation

S = (Vm × NA × Am) / Mv

Where:
S = surface area (m²/g)
Vm = monolayer volume
NA = Avogadro's number
Am = molecular area
Mv = molar volume (22414 cm³)

BET SPECIFIC SURFACE AREA

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Bubble Point Calculator (CFP)

Calculate largest through-pore diameter from bubble point pressure

Young-Laplace Equation

d = 4γ cos θ / ΔP

For complete wetting (θ = 0°):
d = 4γ / ΔP

Bubble point = largest pore
ASTM F316 standard method

MAXIMUM PORE DIAMETER

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Unit Converters

Quick conversion between common pressure and pore size units

Pressure Converter

Pore Size Converter

Quick Reference

Common Constants & Values

Mercury Properties (20°C)

  • Surface tension: 485 mN/m
  • Contact angle: 130-140°
  • Density: 13.534 g/cm³

N₂ at 77 K

  • Cross-section: 16.2 ų
  • P₀: 101.3 kPa
  • Molar volume: 22414 cm³

Ar at 87 K

  • Cross-section: 13.8-14.2 ų
  • P₀: 246.8 kPa
  • Better for micropores

Constants

  • NA: 6.022 × 10²³
  • R: 8.314 J/(mol·K)
  • 1 atm = 101.325 kPa