Table tennis ball vs Tennis ball: size comparison
Table tennis ball: 4 cm. Tennis ball: 6.7 cm. Both silhouettes are drawn at the same scale.
Size ratio: ×1.7
Table tennis ball
4 cm
What is measured Diameter of a table tennis ball
It grew from 38 to 40 mm in 2000 to slow the game down.
Source : Wikipedia — Table tennis
Tennis ball
6.7 cm
What is measured Diameter of a regulation tennis ball
Rules require a diameter between 6.54 and 6.86 cm.
Source : Wikipedia — Tennis ball