Free E-Factor Calculator
Calculate the environmental factor (E-factor) measuring the mass of waste produced per unit mass of desired product.
kg
kg
E-Factor
25.00
Process Mass Intensity (PMI)26.00
E-Factor vs Total Waste Mass
E-Factor (Environmental Factor)
The E-factor is a green chemistry metric that quantifies the waste intensity of a chemical process.
Formula
E-factor = total waste (kg) / desired product (kg)
Typical values: bulk chemicals 1-5, fine chemicals 5-50, pharmaceuticals 25-100+. Lower is better. The related Process Mass Intensity (PMI) = (waste + product) / product = E-factor + 1.
Example Calculation
A pharmaceutical synthesis produces 1 kg of product and 25 kg of waste.
- 01E-factor = 25 / 1 = 25
- 02PMI = (25 + 1) / 1 = 26
- 03For every kg of product, 25 kg of waste is generated.
Frequently Asked Questions
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