Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Engineering
Gear Ratio & Speed Calculator
Calculates the output speed of a two-gear meshing pair given the driver and driven tooth counts and the input speed. Use it when selecting gear pairs for motors, gearboxes, or power-transmission drives. (For output torque, multiply input torque by the gear ratio R = drivenTeeth / driverTeeth and by mesh efficiency — see the explanation below.)
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Engineering
Pipe Pressure Drop Calculator
Calculate frictional pressure drop in a pipe using the Darcy-Weisbach equation, given friction factor, length, diameter, and fluid velocity. Use it for pump sizing, HVAC duct design, and fluid distribution system layout.
Fill in the required fields to see your result.
Key differences
| Gear Ratio & Speed Calculator | Pipe Pressure Drop Calculator | |
|---|---|---|
| Category | Engineering | Engineering |
| Inputs required | 3 | 5 |
| Result | Output Speed (RPM) | Pressure Drop (Pa) |
| What it does | Calculates the output speed of a two-gear meshing pair given the driver and driven tooth counts and the input speed. Use it when selecting gear pairs for motors, gearboxes, or power-transmission drives. (For output torque, multiply input torque by the gear ratio R = drivenTeeth / driverTeeth and by mesh efficiency — see the explanation below.) | Calculate frictional pressure drop in a pipe using the Darcy-Weisbach equation, given friction factor, length, diameter, and fluid velocity. Use it for pump sizing, HVAC duct design, and fluid distribution system layout. |