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How many mhp is 1200 rpm?

Updated: 8/21/2019
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8y ago

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Not nearly enough information to answer. It all depends on your tire diameter and the corresponding revolutions per mile, rear end gear ratio, and transmission final drive ratio. There's a formula for it...

(A*60)/(B*C*D)= your speed at RPMs

A = your RPMs

B = Your transmission drive ratio

C = Your tire revolutions per mile

D = your differential gear ratio


So, I deal with semi trucks, so that's the example I'll use.

So, we're looking for our speed at 1200 RPMs...


(1200*60)/(B*C*D)


My company bought some trucks recently which have a mix of FRO-16210C and RTOC-16909A transmissions.. both of them have a .74 OD ratio in the big hole...


(1200*60)/(.74*C*D)


They run 295/75R22.5 tires, which nominally turn 505 revolutions per mile...


(1200*60)/(.74*505*D)


They have 3.08 rear ends...


(1200*60)/(.74*505*3.08) = about 62.5. So those trucks would be running about 62.5 at 1200 RPMs. The answer to the vehicle you have in mind will vary depending on the specs of that vehicle - this is just to show you how to figure it out.

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8y ago
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8y ago

Depends on many factors. Gearing of the vehicle and size of the wheels being just 2 critical factors.

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8y ago

Need to know what mhp is. More info please.

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Q: How many mhp is 1200 rpm?
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