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Now, since we have our distance and our time, we can use the equation to find the answer. The equation to find how fast you throw a baseball without using a radar gun is: Distance / Time = Speed Now since we are trying to calculate how fast we throw a baseball, we usually use mph.sing the formula above D/T=S .0106 / .000116 = 91.379 mph So, to calculate how fast you throw a baseball in mph without using a radar gun, this is the formula you should use.
95 mph is considered a plus fastball velocity, and +97-98 mph  a plus, plus velocity.    the 90 range is a good speed for an mlb pitcher. some pitchers do  pitch in the high 80s though.real good pitchers pitch 100mph too   Randy Johnson threw a 103 mph fastball.k, soo a good softball speed for 12-13 is 50 mph the really good pitchers throw around 55. When you turn 16-17 your goal should be 55 mph. Collage is high 60 to low 70. I thi â¦ nk high school the really good pitchers will throw around the 60 mph.