I posted these on the Early Ford Registry website, and thought some on this forum may find them useful when calculating speed, rpm, horsepower, money value, displacement, etc......
Speed Calculator - put in distance and time to calculate miles/km per hour:
RPM Calculator - enter three of four variables to calculate rpm, tire diameter, rear end ratio or speed:
Displacement Calculator - find engine displacement (inches or metric) by entering bore and stroke:
Inflation Calculator - find today's value of money from the early Ford period:
Rough Horsepower Calculator - find hp estimate with compression ratio, rpm and cubic inches: