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To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature. Then divide this number by the fraction 5/9. The formula should look like this:  C=59∗(F−32){\displaystyle C={\frac {5}{9}}*(F-32)}  (C){\displaystyle (C)} = Celsius temperature and (F){\displaystyle (F)} = Fahrenheit temperature For example, if the temperature is 100°F, you would first subtract 32 from 100, which would give you 68. Then, you would multiply 68 by 5/9, which would give you the temperature of 37.778°C. If you live outside the United States and use the Celsius scale, you can, of course, skip this step. You can also use online temperature converters to simplify this step. After converting the air temperature to Celsius, you need to find out the saturated vapor pressure, or the maximum amount of water vapor the air at that temperature can hold. You can use this formula to calculate the saturated vapor pressure:  es=6.11∗10(7.5∗T237.3+T){\displaystyle e_{s}=6.11*10({\frac {7.5*T}{237.3+T}})}  (es){\displaystyle (e_{s})} = standard vapor pressure and (T){\displaystyle (T)} = air temperature You can use the same formula to find the actual vapor pressure. All you have to do is substitute the dew point for the air temperature in the formula.  e=6.11∗10(7.5∗Td237.3+Td){\displaystyle e=6.11*10({\frac {7.5*Td}{237.3+Td}})}  (e){\displaystyle (e)} = actual vapor pressure and (Td){\displaystyle (Td)} = dew point You can find the dew point by checking the weather page of your local newspaper or a website that publishes weather information for your local area, such as weather.gov. Now that you have the saturated vapor pressure and the actual vapor pressure, you can find the relative humidity. Just divide the actual vapor pressure by the saturated vapor pressure and multiply that number by 100. You can use this equation:  rh=ees∗100{\displaystyle rh={\frac {e}{e_{s}}}*100}  (rh){\displaystyle (rh)} = relative humidity, (e){\displaystyle (e)} = actual vapor pressure, and (es){\displaystyle (e_{s})} = standard vapor pressure. If math is not your forte, there are several online calculators you can use to calculate relative humidity. Just punch in the temperature and dew point, and you can find out what the relative humidity is in a fraction of a second. The National Weather Service’s relative humidity calculator is one you can use: https://www.wpc.ncep.noaa.gov/html/dewrh.shtml

Summary:
Convert the air temperature and dew-point temperature to Celsius. Calculate the saturated vapor pressure with a formula. Find the actual vapor pressure with the same formula. Calculate the relative humidity. Use an online relative humidity calculator for speed and convenience.