# 7 Best Free Gear Ratio Calculator Websites

Here is a list of the best free gear ratio calculator websites. The gear ratio is calculated by dividing the number of teeth of the driving gear by the number of teeth of the driven gear. In other words, it is a ratio of the number of teeth of the gear ring and the pinion gear. It is calculated solely by the number of teeth on each gear. A gear ratio calculator helps you find the speed and advantage of a gear system.

This post covers 7 free websites with online gear ratio calculators. Some of these calculators are for ring gear and pinion gear train. These calculators give you the ratio of the gears. In some cases, you can through in the RPM and get the initial and final speed. Other websites offer additional gears and shafting options that help you determine the effects of the gear ratio.

## My Favorite Gear Ratio Calculator Website

Omni Calculator is my favorite gear ratio calculator website on this list. This calculator is simple enough to use and gives multiple parameters. First, it can calculate the gear ratio of two gear heads from the number of teeth of each gear and vice versa. It also gives the mechanical advantage of the gear system. Secondly, it also lets you find the gear ratio effects. This includes initial and final RPM and initial and final Torque. You can check it out along with other calculators below.

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## Omni Calculator Omni Calculator is a collection of online calculators that you can use for free. It has a free Gear Ratio Calculator to find the gear ratio along with its effect. This calculator has two segments. The first segment is where you can find the gear ratio by entering the number of teeth of input and output gear. Along with the gear ratio, it also gives you a mechanical advantage. If you know the gear ratio and the number of teeth of one of the gear, you can also find the number of other gear teeth. Moving on to the second segment of the calculator, this section is for finding the gear effects. It has four parameters; input rotation speed, output rotation speed, input torque, and output torque. You can enter any input value to get the output value and vice versa.

### Highlights:

• This calculator calculates the gear ratio among 2 gear heads.
• Find gear teeth number from gear ratio.
• It also gives the Mechanical Advantage of the gears.
• It can also find the gear ratio affects including rotation speed and torque.

## Tire Size Tire Size has an online gear ratio calculator to find the effective gear ratio while changing to new tire size. For that, you have to enter the stock tire size and the new tires sizes along with your original gear ratio. Then you can click on the “Calculate” button to find the new effective gear ratio. Along with that, it also gives you the gear ratio needed to return your vehicle back to stock gearing. This is helpful in order to return back to your original gear ratio when going to a bigger or smaller tire.

### Highlights:

• This calculator calculates both, the effective and the new gear ratios.
• It gives you the effective ratio for tire size change.
• It also finds the near gear ratio for returning to the stock gearning.

## Strange Engineering Strange Engineering offers a free online gear ratio calculator. This is a simple calculator to quickly find the correct gear ratio for the ring and pinion gear set. It has four parameters; Gear Ratio, RPM, Tire Diameter, and Speed. You can calculator any of these values by entering the other three. To find the gear ratio, check the ratio button alongside it and enter the values of RPM, Tire Diameter (in inches), and MPH (Speed). With that, it calculates the gear ratio using a 1:1 final drive ratio.

### Highlights:

• This calculator calculates the gear ratio of the ring and pinion gear set.
• It finds the gear ratio from speed, tire diameter, and speed.
• This calculator uses the 1:1 final drive ratio.

## Summit Racing Summit Racing is another free website with an online gear ratio calculator. This calculator is similar to the one you find on the Strange Engineering website. The calculator comes with input fields for gear ratio, RPM, speed, and tier size. You can enter any three values to get the fourth one. Thus, you can get the gear ratio if you know the speed, tire diameter, and RPM. This calculator also uses the 1:1 final drive ratio.

### Highlights:

• It calculates the gear ratio of the ring and pinion gear set.
• It calculates gear ratio from speed, tire diameter, and speed.
• It can find speed, tire diameter, or speed as well.
• This calculator uses the 1:1 final drive ratio.

## Spicer Parts Spicer Parts has a free online gear ratio calculator that helps you determine the ratio between the ring gear and pinion gear. It is a simple calculator with two input fields. All you have to do is enter the ring gear teeth and pinion gear teeth. When you do that, it finds the gear ratio and shows that on the screen. It shows the ratio in decimal values.

### Highlights:

• This calculator calculates the ring and pinion gear ratio.
• It is simple and straightforward to use.

## Houston Rebuilt Axles Houston Rebuilt Axles is a website with a free online gear ratio calculator. This website offers a simple calculator that finds the gear ratio between two gear heads. One gear is ring gear and other gear is pinion gear. There are two input fields, one for each. You have to enter the number of teeth of each gear in the respective field. When you do that, it instantly gives you the gear ratio.

### Highlights:

• This calculator calculates the hear ratio among 2 gear heads.
• Finds gear ratio of the ring gear and pinion gear.

## Evolvent Design Evolvent Design is yet another free website with an online gear ratio calculator. This is a robust calculator that can find gear ratio among up to 8 gears. You can start by entering the number of teeth of the input gear. Then you can add as many more gears as you want. As you add more gears, you get to pick at which shaft the gear is attached. This way, you can easily calculate the gear ratio of up to 8 gears. Apart from that, you can also get the input and output speed by inserting the RPM.

### Highlights:

• This calculator can calculate the gear ratio of up to 8 gears.
• Option to select the shaft of the gears.
• It can also calculate input and output speed.
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