How a sprocket ratio help you? It shows the link between two sprockets. It tells how many turns one makes for each turn of the other. The tool can take teeth counts or RPM and give the ratio.
It will show speed change and torque change. You can use it on bikes, machines, or in class. The calculator will save time. It will keep numbers clear. It will help you pick parts that fit.
When to calculate sprocket ratio
An engineer is teaching a small team on the shop floor. He shows two sprockets. One has 12 teeth. The other has 36 teeth. He asks the team to find output speed when motor runs. He uses the ratio now to show speed and torque. He points, he explains, and they try on a real chain. They learn fast. They see the result live.
Calculate the values — step by step
First, know the formula.
Sprocket Ratio = Driven Teeth ÷ Driver Teeth.
Second, note given numbers. Driver (small) = 12 teeth. Driven (large) = 36 teeth. Motor speed = 1200 RPM.
Third, compute ratio. Ratio = 36 ÷ 12 = 3.
Fourth, find output RPM. Output RPM = Motor RPM ÷ Ratio. So output = 1200 ÷ 3 = 400 RPM.
Fifth, note torque change. Torque multiplies by the ratio. So output torque = Motor torque × 3.
Sixth, check chain speed if you want. Chain speed will change with sprocket diameter. But teeth ratio gives the core link.
Seventh, write result in plain line: For every one turn of the small sprocket, the big sprocket turns one third. The big sprocket turns slower. It gives more force.
FAQs
Q: Can I use tooth count only?
A: Yes. Teeth give the basic ratio.
Q: Does bigger ratio give more torque?
A: Yes. Bigger ratio raises torque and lowers speed.
Q: Can I use RPM input?
A: Yes. Put motor RPM and divide by ratio to get output RPM.
Final Words
Quick trick: divide driven teeth by driver teeth. That gives the ratio. Use it to get output RPM by dividing motor RPM by the ratio. A calculator will cut mistakes and speed the work.