Cricket Stumps and Bails Dimensions Explained
The exact size of stumps and bails, how they are made, and why their measurements are so precisely specified in the Laws.
Stump Specifications
| Measurement | Imperial | Metric |
|---|---|---|
| Stump height above ground | 28 inches | 71.12 cm |
| Width of three stumps combined | 9 inches | 22.86 cm |
| Maximum stump diameter | 1.5 inches | 3.81 cm |
| Minimum stump diameter | 1.375 inches | 3.49 cm |
| Bail length | 4.375 inches | 11.11 cm |
| Bail groove (in stump top) | 0.5 inches deep | 1.27 cm |
Why the Dimensions Are Specified
The 9-inch total width of the stumps is a fundamental constant in cricket: a legal delivery must be aimed at a target of exactly 9 inches wide. The height of 28 inches defines the vertical zone the ball must threaten for an LBW decision to stand. If stumps and bails were different sizes, the entire basis of ball-tracking technology predictions would need recalibration.
Materials and Construction
Traditional stumps are made from willow or ash — the same woods used in bat making — and painted white. Modern high-visibility stumps for day-night matches are sometimes fluorescent yellow or orange. The top of each stump has a small groove machined into it, exactly the right depth to cradle the bail while allowing the bail to be dislodged by even minimal contact from the ball or the keeper's glove.
LED Bails
ICC-approved LED bails contain a small circuit, battery, and optical sensor. When the bail's connection to the stump groove is broken, the circuit triggers and the bail lights up in red within 1/1000th of a second. This technology allows TV cameras to capture the exact moment of wicket-breaking without ambiguity. LED bails are now mandatory for all ICC event finals and used in most bilateral internationals at participating boards.
Frequently asked questions
What are the bails made of?
Traditional bails are turned from willow or ash. LED bails contain a polycarbonate outer shell with LED circuitry inside — they weigh the same as traditional bails to ensure the wind dislodgement characteristics are unchanged.
Can stumps be replaced during a match?
Yes — if a stump is damaged or knocked out of the ground, it may be replaced with an equivalent substitute. The replacement must meet the same dimensional specifications.
Why are there three stumps?
Three stumps cover exactly 9 inches, providing no gap between them for the ball to pass through. Two stumps historically did leave a gap, and the third was added around 1776 after a ball passed between two stumps without disturbing a bail.