Engine rpm Calculator

✖Speed of vehicle in mph is defined as the velocity of the vehicle measured in miles per hour.ⓘ Speed of Vehicle [MPH]			+10% -10%
✖Gear Ratio of Transmission is the ratio between the revolutions of the engine crankshaft and the revolutions of the shaft which comes out of the gearbox.ⓘ Gear Ratio of Transmission [i_g]			+10% -10%
✖Tire Diameter is defined as the diameter of the tire that is propelled by the engine power.ⓘ Tire Diameter [D]			+10% -10%

✖Engine RPM is defined as the number of rotations of the engine crankshaft in one minute.ⓘ Engine rpm [ω_e]

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Formula

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Engine rpm

Formula

ω e = \frac{MPH \cdot i g \cdot 336}{D}

Example

288758.6 rev/min = \frac{60 mi/h \cdot 2.55 \cdot 336}{76 cm}

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Engine rpm Solution

STEP 0: Pre-Calculation Summary

Formula Used

Engine RPM = (Speed of Vehicle*Gear Ratio of Transmission*336)/Tire Diameter
ω_e = (MPH*i_g*336)/D
This formula uses 4 Variables

Variables Used

Engine RPM - (Measured in Radian per Second) - Engine RPM is defined as the number of rotations of the engine crankshaft in one minute.
Speed of Vehicle - (Measured in Meter per Second) - Speed of vehicle in mph is defined as the velocity of the vehicle measured in miles per hour.
Gear Ratio of Transmission - Gear Ratio of Transmission is the ratio between the revolutions of the engine crankshaft and the revolutions of the shaft which comes out of the gearbox.
Tire Diameter - (Measured in Meter) - Tire Diameter is defined as the diameter of the tire that is propelled by the engine power.

STEP 1: Convert Input(s) to Base Unit

Speed of Vehicle: 60 Mile per Hour --> 26.8224 Meter per Second (Check conversion here)
Gear Ratio of Transmission: 2.55 --> No Conversion Required
Tire Diameter: 76 Centimeter --> 0.76 Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

ω_e = (MPH*i_g*336)/D --> (26.8224*2.55*336)/0.76

Evaluating ... ...

ω_e = 30238.7267368421

STEP 3: Convert Result to Output's Unit

30238.7267368421 Radian per Second -->288758.569993113 Revolution per Minute (Check conversion here)

FINAL ANSWER

288758.569993113 ≈ 288758.6 Revolution per Minute <-- Engine RPM

(Calculation completed in 00.020 seconds)

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Created by Syed Adnan

Ramaiah University of Applied Sciences (RUAS), bangalore

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National Institute Of Technology (NIT), Hamirpur

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< Important Formulas of Engine Dynamics Calculators

Brake Power given Mean Effective Pressure

Go Brake Power = (Brake Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))

Beale Number

Go Beale Number = Engine Power/(Average Gas Pressure*Piston Swept Volume*Engine Frequency)

Brake specific fuel consumption

Go Brake Specific Fuel Consumption = Fuel Consumption in IC engine/Brake Power

Brake Power given Mechanical Efficiency

Go Brake Power = (Mechanical Efficiency/100)*Indicated Power

< Characteristics and Operational Metrics Calculators

Beale Number

Go Beale Number = Engine Power/(Average Gas Pressure*Piston Swept Volume*Engine Frequency)

Swept Volume

Go Swept Volume = (((pi/4)*Inner Diameter of Cylinder^2)*Stroke Length)

Mean piston speed

Go Mean Piston Speed = 2*Stroke Length*Engine Speed

Friction Power

Go Friction Power = Indicated Power-Brake Power

Engine rpm Formula

Engine RPM = (Speed of Vehicle*Gear Ratio of Transmission*336)/Tire Diameter
ω_e = (MPH*i_g*336)/D

What is Engine RPM?

The full form of RPM stands for “revolution/rotations per minute.” It signifies the speed at which the rotation of the crank in the engine takes place resulting in the deliverability of power to the rear wheels via a gearbox. Every rotation of the crank results in the movement of the gearbox such that it translates to the speed of the engine. The higher the RMP, the more significant is the speed of the bike, in turn, more significant is the fuel consumptions as well.

How to Calculate Engine rpm?

Engine rpm calculator uses Engine RPM = (Speed of Vehicle*Gear Ratio of Transmission*336)/Tire Diameter to calculate the Engine RPM, The Engine RPM formula signifies the speed at which the rotation of the crank in the engine takes place resulting in the deliverability of power to the rear wheels via a gearbox. Engine RPM is denoted by ω_e symbol.

How to calculate Engine rpm using this online calculator? To use this online calculator for Engine rpm, enter Speed of Vehicle (MPH), Gear Ratio of Transmission (i_g) & Tire Diameter (D) and hit the calculate button. Here is how the Engine rpm calculation can be explained with given input values -> 2.8E+6 = (26.8224*2.55*336)/0.76.

FAQ

What is Engine rpm?

The Engine RPM formula signifies the speed at which the rotation of the crank in the engine takes place resulting in the deliverability of power to the rear wheels via a gearbox and is represented as ω_e = (MPH*i_g*336)/D or Engine RPM = (Speed of Vehicle*Gear Ratio of Transmission*336)/Tire Diameter. Speed of vehicle in mph is defined as the velocity of the vehicle measured in miles per hour, Gear Ratio of Transmission is the ratio between the revolutions of the engine crankshaft and the revolutions of the shaft which comes out of the gearbox & Tire Diameter is defined as the diameter of the tire that is propelled by the engine power.

How to calculate Engine rpm?

The Engine RPM formula signifies the speed at which the rotation of the crank in the engine takes place resulting in the deliverability of power to the rear wheels via a gearbox is calculated using Engine RPM = (Speed of Vehicle*Gear Ratio of Transmission*336)/Tire Diameter. To calculate Engine rpm, you need Speed of Vehicle (MPH), Gear Ratio of Transmission (i_g) & Tire Diameter (D). With our tool, you need to enter the respective value for Speed of Vehicle, Gear Ratio of Transmission & Tire Diameter and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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