Heat Index Calculator, Formula, Calculation

Heat Index Calculator:

Enter the Temperature in celsius (°C), Relative Humidity in %, Dew point in celsius (°C), and you get the calculation Heat index in celsius (°C).

Heat Index Calculator

Heat Index Formula:

Heat index Heat Index Formula is HI(0F) in degree Fahrenheit is equal to the product of C1,C2,C3,C4,C5 ,C6,C7,C8 and multiply the Temperature T1,T2(F0) in Fahrenheit and the Relative humidity is R .Hence the Heat Index Formula can be written as

HI(F)=C1+C2 *T(F0)+C3R+C4 TR+C5 T2(F0)++C6R2+C7 T2(F0)+ R+C8 T(F0)+ R2 +C9 T2(F0)+ R2

In this formula

HI=heat index in degree Fahrenheit

R=Relative humidity percent

T=Temperature in F0

C1=-42.379

C2=-2.04901523

C3=-10.14333127

C4=-0.22475541

C5=-6.83783 *10-3

C6=-5.481717*10-2

C7=-1.22874*10-3

C8=8.5282 *10-4

C9=1.99 *10-6

Example:1

Calculate temperature 750F and relative humidity 45 percent  find the heat index value?

Answer:

Temperature=750F

Relative Humidity=45 percent

By using formula

Heat index (HI)=c1+c2*t+c3*r+c4*t*r+c5(t)2+c6(r)2+c7(t)2+c8t(r)2+c9(t)2*(r)2

Heat index =77.6 0F

Example:2

Calculate temperature 450F and relative humidity 54 percent  find the heat index value?

Answer:

Temperature=450F

Relative Humidity=54 percent

By using formula

Heat index (HI)=c1+c2*t+c3*r+c4*t*r+c5(t)2+c6(r)2+c7(t)2+c8t(r)2+c9(t)2*(r)2

Heat index =112.2 0F

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