Feels Like Temperature Calculator
The Feels Like Temperature Calculator computes feels like temperature from the relation apparent temp = air temp + 0.33 x vapour pressure - 0.70 x wind speed - 4.00. It takes 3 inputs (air temperature in C, relative humidity in %, wind speed in m/s) and returns the feels like temperature. These tools are for pet owners and for anyone planning a day around the weather, their time outdoors, their sleep or their working hours, turning something you already know, a pet's age, a UV index, a bedtime or the length of a work session, into a figure you can act on. Enter your values below and the result updates instantly, and you can share a permalink that pre-fills the exact calculation. Enter your own actual figures rather than a typical or average value, check the units and the time format shown on each field before you read the answer, and run it again whenever your inputs change, because a result only holds for the conditions and the routine you entered. For example, with air temperature = 25 C, relative humidity = 50 %, wind speed = 3 m/s, the feels like temperature works out to 24.111189, and the worked example further down the page shows every step so you can follow the arithmetic and reproduce it by hand. The method is the standard form documented by U.S. National Weather Service, Heat Index, and the figure above each result carries the date it was last verified. The result describes a typical pattern rather than an individual: animals vary by breed, size and health, and people vary in how they tolerate sun, cold, lost sleep and long stretches of focus, so treat the figure as a planning guide and take any worry about an animal to a veterinarian, or about your own health to a qualified clinician.
With Air temperature = 25 C, Relative humidity = 50 %, Wind speed = 3 m/s, the result is 24.111189.
Applies to: any numeric inputs. Method source: U.S. National Weather Service, Heat Index, checked 2026-06-23.
The formula
apparent temp = air temp + 0.33 x vapour pressure - 0.70 x wind speed - 4.00
Worked example
With Air temperature = 25 C, Relative humidity = 50 %, Wind speed = 3 m/s:
- Water vapour pressure e = (rh / 100) x 6.105 x exp(17.27 x T / (237.7 + T)) = 15.7915
- Apparent temp = T + 0.33 x e - 0.70 x wind - 4.00 = 24.11
- Feels Like Temperature = 24.111189
This worked example is one of the automated golden-value tests this calculator must pass before it can publish.
What this assumes
- Inputs are real numbers in the units shown.
- The result is the exact value of apparent temp = air temp + 0.33 x vapour pressure - 0.70 x wind speed - 4.00; general information, not professional advice.
Frequently asked questions
What formula does this use?
apparent temp = air temp + 0.33 x vapour pressure - 0.70 x wind speed - 4.00, the standard form documented by U.S. National Weather Service, Heat Index.
Does the result ever change over time?
No. This is a pure formula with no external rate, so the same inputs always give the same result.
Official sources and verification
- Method: U.S. National Weather Service, Heat Index, checked 2026-06-23.
Reviewed by the CalculatorHub team, edited by James Graham, 2026-06-23. See our methodology. General information, not professional advice.