Wet-Bulb Temperature Calculator
Wet-bulb from dry-bulb and RH (Stull 2011) — cooling towers, evap coolers, heat stress.
Wet bulb is the floor for every evaporative process: cooling towers approach it within 3–5 °C, swamp coolers within ~70–80% of the depression.
Formula
Wet-Bulb Temperature Calculator is a free wet bulb calculator for HVAC designers, technicians and energy auditors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Wet-Bulb Temperature Calculator
Wet-bulb from dry-bulb and RH (Stull 2011) — cooling towers, evap coolers, heat stress. The calculation implements Stull (2011) empirical fit, ±0.3 °C for 5–99% RH (Stull, J. Appl. Meteor. Climatol. 50 (2011)). Wet bulb is the floor for every evaporative process: cooling towers approach it within 3–5 °C, swamp coolers within ~70–80% of the depression.
How to use Wet-Bulb Temperature Calculator
- 1Enter Dry-bulb temperature in °C.
- 2Enter Relative humidity in %.
- 3Read Wet-bulb temperature, Wet-bulb depression instantly — no submit button needed.
Why use Wet-Bulb Temperature Calculator?
- ✓Implements the standard formula — Stull (2011) empirical fit, ±0.3 °C for 5–99% RH
- ✓Reference cited on-page: Stull, J. Appl. Meteor. Climatol. 50 (2011)
- ✓Built-in engineering verdict flags out-of-range results instantly
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Wet-Bulb Temperature Calculator use?+
It computes Stull (2011) empirical fit, ±0.3 °C for 5–99% RH, per Stull, J. Appl. Meteor. Climatol. 50 (2011). The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Wet bulb is the floor for every evaporative process: cooling towers approach it within 3–5 °C, swamp coolers within ~70–80% of the depression.
Is this based on ASHRAE methods?+
The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.
Is the Wet-Bulb Temperature Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
Related Engineering tools
Reynolds Number Calculator
Compute Re from density, velocity, pipe diameter and viscosity — with instant laminar/turbulent classification.
● LiveLaminar vs Turbulent Flow Classifier
Classify hydraulic-oil or process-fluid flow regime from kinematic viscosity, line velocity and tube bore.
● LiveBernoulli Equation Solver
Solve downstream pressure between two points from velocities, elevations and fluid density (ideal, lossless).
● Live