My method is to remember how many centimeters I need to move my mouse to make a 360 degree turn on my default setting of 1000 DPI raw input in CSGO , then I try to set sensitivity in all other games to the same distance . <| sep |> Hey uwjdalstn 17 , you are posting here too often ! We currently allow 3 TradeStore posts per day and this is your 4 th TradeStore post . You can read the rules . <| sep |> B is closer to what most on air meteorologists use , but it ' s not quite correct . does this 40 percent mean ? . will it rain 40 percent of of the time ? . will it rain over 40 percent of the area ? The Probability of Precipitation PoP describes the chance of precipitation occurring at any point you select in the area . How do forecasters arrive at this value ? Mathematically , PoP is defined as followsPoP C x A where C the confidence that precipitation will occur somewhere in the forecast area , and where A the percent of the area that will receive measureable precipitation , if it occurs at all . So . in the case of the forecast above , if the forecaster knows precipitation is sure to occur confidence is 100 % , heshe is expressing how much of the area will receive measurable rain . PoP C x A or 1 times . 4 which equals . 4 or 40 %. But , most of the time , the forecaster is expressing a combination of degree of confidence and areal coverage . If the forecaster is only 50 % sure that precipitation will occur , and expects that , if it does occur , it will produce measurable rain over about 80 percent of the area , the PoP chance of rain is 40 %. PoP . 5 x . 8 which equals . 4 or 40 %. In either event , the correct way to interpret the forecast is there is a 40 percent chance that rain will occur at any given point in the area .