What is being measured?
2025 regulation specification; not a claim about every manufactured ball or a reviewed 2026 edition.
Use the named object, variant and dimension. A manufactured or natural object can differ from this reference.
- Dimension
- diameter
- Reference value
- 40 mm
- Evidence
- Nominal standard size
- In metres
- 0.040 m
Put the length in perspective
One Table tennis ball — 2025 rules represents approximately 0.467 card lengths measured end to end. This is a length ratio; it does not calculate how the objects pack or fit.
Table tennis ball — 2025 rules · 0.040 m
Metre · 1 m
Foot (international) · 0.3048 m