// multi-utility computation suite · offline · instant · precise
┌──────────────────────────┐
│ [c] calcalyst_ │
│ computation suite │
└──────────────────────────┘
// select a module to initialize
/ search↵ open firstesc close
// adsenseEMPTY_LEADER_SLOT728×90
// keyboard shortcuts
/focus search
Escclear search · close calc
Enteropen first result
↑↓navigate list
?toggle this panel
// adsenseMOBILE_ANCHOR_SLOT320×50
// keyboard_shortcuts
/focus search
↑↓navigate module list
Enter
open first result from search
open highlighted
compute when module is open
compute when focused in a field
Escclose module · clear selection
⌫
sci.Penman-Monteith-ET Calculator
Calculates reference evapotranspiration ET₀ using the FAO-56 Penman-Monteith equation from solar radiation, temperature, humidity, and wind speed. ET₀ represents a hypothetical reference crop (grass, 0.12 m height) — crop ET = ET₀ × Kc, where Kc varies by growth stage.
Inputs
Rn Mj M2 Day
Reference formula or conversion factor shown for context.
G Mj M2 Day
Reference formula or conversion factor shown for context.
T C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
U2 M S
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Es Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Ea Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Results
ET₀ reference evapotranspiration (mm/day)
The proportional relationship between two quantities.
slope of saturation vapour pressure curve Δ
How close the system is to its capacity limit. Above 80% sustained saturation typically leads to queuing and latency spikes.
vapour pressure deficit VPD (kPa)
Reference formula or conversion factor shown for context.
Penman-Monteith FAO-56
Sample size or count used in the calculation.
ET₀ typical range
The difference between the maximum and minimum values.