In general, add aboout 20 mph because you are calculating the different pitching lengths. Little league pitchers throw from 45 feet, major leaguers throw from 60.5 feet. For example, a little league pitcher throwing a 70 mph pitch is equivalent to a major league player throwing about a 90 mph pitch.
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50- 65mph if thrown hard
Their fastballs are around 70mph, the equivalent to 90mph in MLB. ESPN shows the conversion to MLB since they pitch from 60'6" and Little League is only at 46'. Whatever it is, I'd be pressed to hit it.
If the measure of ease of hitting a fastball were how long the batter sees it, then the calculation would be straightforward. Dividing the major league distance to the mound, 60.5 ft, by the little league distance, 46 ft, gives approximately 1.3152. Multiplying 40 mph by 1.3152 gives 52.6 mph, which a major league batter should easily hit. Multiplying 50 mph by 1.3152 gives 65.76 mph, which a major league batter should also easily hit if it is a fastball. A 90 mph fastball, which is somewhat challenging to a major league batter, would be equivalent to 90 mph divided by 1.3152 = a 68.43 mph fastball in little league, which is not expected. Since one mile is 5280 ft and one hour is 3600 seconds, a speed in miles per hour can be converted to feet per second by multiplying by 5280 ft / 3600 sec = 1.467 ft/sec = 1 mph. So the 40 mph little league pitch and the 52.6 mph major league pitch each give the batter a 46 ft / 58.67 ft/sec = 0.784 sec look. The 50 mph little league pitch (if there is one) and the 65.76 mph major league pitch each give the batter a 46 ft / 73.35 ft/sec = 0.627 sec look. The 90 mph major league fastball gives the batter a 60.5 ft / 118.36 ft/sec = 0.511 sec look. However, even this interval is much longer than the typical 0.1 sec human reaction time. Perhaps a batter needs about half a second to swing. It is possible though difficult to hit a curve ball or sinker. The measure of difficulty for that might be the distance the ball travels in the last 0.5 sec, and that doesn’t depend on the distance to the mound if the speed is measured near the plate. It just depends on the speed, which is easier to achieve if the mound is near the plate, and on the curve radius. So converting pitch speed by length of look probably over-corrects, especially if the fastball has some spin. Perhaps the mean of actual and converted speeds would be a better estimate of major league equivalents for little league pitches.
I don't know exactly but I've watched the Little League World Series enough and they always refer to Little Leaguers pitching speed in relation to MLB and I believe that 70 mph Little League would be around 100 mph MLB A 70 mph little league pitch is equivalent to about a 111 mph MLB pitch. (This is calculated based on an average little league pitch at 57.5 mph and an average MLB pitch at 91 mph.)
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depends on how fast its thrown. every pitcher has a different speed