Electrical and Engineering
Gear Ratio Speed Calculator
Gear Ratio Speed Calculator calculate gear reduction, output shaft speed, wheel speed, and theoretical vehicle speed from tooth counts and tire diameter.
Electrical and Engineering
Gear Ratio Speed Calculator
Calculate gear reduction, output shaft speed, wheel speed, and theoretical vehicle speed from tooth counts and tire diameter.
Formula
Gear ratio = driven teeth / driving teeth; output RPM = input RPM / ratio.
About the Gear Ratio Speed Calculator
Calculate gear reduction, output shaft speed, wheel speed, and theoretical vehicle speed from tooth counts and tire diameter. This tool keeps the requested measurements separate and applies the named method instead of substituting an unrelated general estimate.
How the Gear Ratio Speed Calculator Works
Wheel circumference converts output revolutions per minute to distance per hour when a tire diameter is supplied.
Formula
Gear ratio = driven teeth / driving teeth; output RPM = input RPM / ratio.
The calculation runs in your browser. Values are validated for required ranges, compatible units, and method-specific restrictions before results are displayed.
Required Inputs
- Driving gear teeth (required).
- Driven gear teeth (required).
- Input speed (required) - enter in rpm.
- Tire diameter (required) - enter in in.
Results Reported
The result panel reports the final answer and the intermediate quantities needed to check the calculation:
- Gear ratio
- Output speed (rpm)
- Ideal torque multiplier
- Theoretical speed (mph)
Gear Ratio Speed Calculator Example
Select Example Data in the calculator to load this reproducible input set:
| Input | Example value |
|---|---|
| Driving gear teeth | 15 |
| Driven gear teeth | 45 |
| Input speed | 3000 rpm |
| Tire diameter | 26 in |
How to Use the Calculator
- Confirm that the calculator title and formula match the quantity you need.
- Enter every required value using the unit shown with its field.
- Select Example Data to inspect a valid input set, or enter your own values and select Calculate.
- Review all reported values and the displayed formula before using the answer.
- Use Copy Result or Download CSV when you need a reusable record.
Accuracy and Limitations
Real speed differs with tire growth, slip, converter or clutch behavior, drivetrain losses, and additional transmission ratios.
Keep units consistent, use measurements that represent the actual situation, retain full precision during the calculation, and round only the final answer. Professional decisions may require current official rules, field measurements, laboratory methods, or specialist review.
Frequently Asked Questions
What does the Gear Ratio Speed Calculator calculate?
Calculate gear reduction, output shaft speed, wheel speed, and theoretical vehicle speed from tooth counts and tire diameter.
Which formula does the Gear Ratio Speed Calculator use?
Gear ratio = driven teeth / driving teeth; output RPM = input RPM / ratio. Wheel circumference converts output revolutions per minute to distance per hour when a tire diameter is supplied.
How should I use the Gear Ratio Speed Calculator result?
Real speed differs with tire growth, slip, converter or clutch behavior, drivetrain losses, and additional transmission ratios.