More Than Just a Tall Cylinder
A mug looks like a cylinder, but it isn't quite. A good mug has subtle shape decisions built into it that make it a pleasure to use: a slight taper, the right proportions, and walls thick enough to keep a drink warm.
Proportions to Aim For
A standard mug holds about 300–400ml. As a rough guide when throwing:
- Height: approximately equal to or slightly taller than the width at the rim.
- Base: slightly narrower than the rim: a gentle outward taper from base to lip.
- Wall thickness: 5–7mm. Thicker than a decorative vase, because a mug gets daily handling.
These proportions feel comfortable in the hand and hold heat well.
The Gentle Belly
The most satisfying mugs have a very slight belly: a subtle outward curve in the lower third of the body that tapers back in just below the rim. This is not a dramatic shape; it is a few millimetres of outward pressure applied during one pull.
To create it: on your second or third pull, apply just slightly more outward pressure with your inside hand in the lower third than in the upper third. Then on the final pull, let the upper section tighten slightly.
The Rim
A mug rim should be smooth, slightly compressed, and flat on top, not razor-thin. Thin rims chip easily and feel uncomfortable against the lip when drinking.
Compress the rim with two fingers after every pull, and finish by smoothing across the top with a wet chamois or finger.
Functional Mug Test
Before wiring off, simulate use:
- Check lip comfort with fingertip
- Confirm body feels balanced in hand
- Ensure wall thickness is consistent where handle will attach
Function-first checks improve user experience dramatically.
Did You Know?
The chamois leather used to smooth rims has been a finishing tool for centuries, prized for its softness and absorbency. Mug proportions and the subtle belly shape connect to broader ideas in ergonomics, the science of designing objects that fit the human body comfortably. Bernard Leach, often called the father of British studio pottery, championed the idea that a well-made mug is as worthy as any sculpture.
