Psychrometric Chart Calculator Excel Apr 2026

[ p_ws = 0.61094 \cdot \exp\left( \frac17.625 \cdot T_dbT_db + 243.04 \right) ] where ( T_db ) is in °C, result in kPa. 1. Humidity ratio from vapor pressure

– solved iteratively from ( p_ws(T_dp) = p_w ). psychrometric chart calculator excel

=0.61094*EXP(17.625*B3/(B3+243.04)) Cell B6: [ p_ws = 0

=0.62198 * B6 / (B2 - B6) Cell B8:

[ RH = \fracp_wp_ws(T) \times 100% ]