Heel-to-toe drop, explained

The short answer

Heel-to-toe drop is the difference in stack height between the heel and the forefoot. A shoe with a 36 mm heel and a 28 mm forefoot has an 8 mm drop.

Most road running shoes sit between 4 mm and 12 mm. Zero-drop shoes exist but are a smaller category, and they ask more of your calves and Achilles.

What drop changes

Higher drop shifts load toward the hips and knees and makes heel striking more natural. Lower drop shifts load toward the ankle, calf and Achilles. Neither is inherently better; they suit different bodies and different running histories.

Drop also changes how a shoe feels when you are tired. A high-drop shoe can feel like it is guiding you forward; a low-drop shoe can feel flatter and more connected to the road.

If you are happy in a shoe, its drop is probably right for you. Change one thing at a time.

Moving between drops safely

If you want to try a lower drop, do it gradually. Rotate the new shoe into short, easy runs for two or three weeks before using it for longer or faster sessions. Sudden switches from 12 mm to 4 mm are a common cause of calf tightness.

Older runners and anyone with a history of Achilles issues should be conservative here. If a lower drop causes pain that lingers, go back up.

Drop and shoe choice

Drop is a fit-and-feel decision, not a performance one. Choose a drop that lets you run comfortably for the sessions you do most. For a rotation, a small spread – say 6 mm to 10 mm – can add variety without stressing your calves.

If you are unsure, stay near the middle. Most daily trainers are 8 mm to 10 mm because that range works for the widest group of runners.

0–4 mm

Flat platform; more calf and Achilles load.

5–8 mm

Modern middle ground; works for most runners.

9–12 mm

Traditional; more heel and knee load.

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