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Gear outside diameter calculator

Gear outside diameter calculator

Calculate outside diameter for a standard spur gear with no profile shift, plus pitch diameter, addendum and circular pitch. Inputs, formula and interpretation are separated so you can verify the result before using it for a configurable part.

Calculate

Calculate outside diameter for a standard spur gear with no profile shift, plus pitch diameter, addendum and circular pitch
Inputs: Module
Inputs: Number of teeth

Schematic illustration – not to scale.

Gear outside diameter calculatorSchematic illustration – not to scale. Module, Number of teeth da = m × (z + 2)m, z, d

Schematic illustration – not to scale.

Formula

da = m × (z + 2)

The formulas assume standard spur gears with the same module and no profile shift.

Step by step

  1. Enter the measured or planned values with their units.
  2. Check the formula with substituted values in the result area.
  3. Copy the parameters or open a related product for configuration.

Complete worked example

Worked example with typical workshop values: insert the inputs, apply da = m × (z + 2) and compare the result with the reference table.

23060 mm
14040 mm
32060 mm

Assumptions and limitations

  • The formulas assume standard spur gears with the same module and no profile shift.

Common input mistakes

  • Decimal comma and point are accepted, but do not type units into numeric fields.
  • For gears, the tooth count must be a whole number in practice.

FAQ

Do two gears need the same module?

Yes, meshing spur gears normally require the same module.

Can I manufacture directly from this result?

Use the value as a calculation and configuration aid. Loaded or standards-critical parts need engineering review.

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