PMV/PPD Thermal Comfort Calculator

Calculate Predicted Mean Vote (PMV) and Predicted Percentage Dissatisfied (PPD) for indoor thermal comfort assessment using Fanger's model according to ASHRAE 55-2020 and ISO 7730.

ASHRAE 55-2020ISO 7730Fanger Model

Thermal Comfort Calculator

Enter environmental and personal factors to calculate thermal comfort indices

About Thermal Comfort

PMV (Predicted Mean Vote) predicts the mean thermal sensation of a large group of people on a 7-point scale from cold (-3) to hot (+3). PPD (Predicted Percentage Dissatisfied) estimates the percentage of people likely to feel thermally uncomfortable.

Standards

ASHRAE Standard 55-2020
ISO 7730:2005

Key Factors

4 Environmental: Air temp, Radiant temp, Air velocity, Humidity
2 Personal: Metabolic rate (activity), Clothing insulation

Comfort Zone

PMV: -0.5 to +0.5 for typical comfort
PPD: Less than 10% dissatisfied

Tips

Radiant temp often differs from air temp near windows or cold surfaces
Adjusting clothing is the easiest way to improve comfort
Higher air velocity can offset warm temperatures

Key Formulas

PMV (Fanger):

PMV = (0.303 e^{-0.036M} + 0.028) \cdot L

PPD:

PPD = 100 - 95 e^{-0.03353 \cdot PMV^4 - 0.2179 \cdot PMV^2}

PMV/PPD Thermal Comfort Calculator

Environmental Conditions

Personal Factors