Snails come in an enormous range of sizes — from microscopic species barely visible to the naked eye, to the giant African snail which can reach the length of a human forearm. Here's how the most common snail species compare.
Garden Snail Size
The common garden snail (Cornu aspersum) is mid-sized among land snails:
- Shell diameter: 25–40 mm (roughly the size of a 50p coin)
- Body length (extended): 7–10 cm
- Weight: 5–25 grams
Size Comparison Table
| Species | Shell Size | Body Length | Habitat |
|---|---|---|---|
| Dwarf pond snail | 4–8 mm | ~1 cm | Freshwater |
| Garden snail | 25–40 mm | 7–10 cm | Land/Garden |
| Roman (Burgundy) snail | 40–55 mm | 10–15 cm | Land/Woodland |
| Giant African Snail | Up to 200 mm | Up to 30 cm | Land/Tropical |
| Giant whelk (sea snail) | Up to 700 mm | Body ~30 cm | Marine |
📏 Fun size fact: The giant African land snail (Achatina fulica) is the largest land snail in the world. The biggest recorded specimen had a shell 39.3 cm long and weighed nearly 900 grams — heavier than most mobile phones.
Snail vs Human: A Scale You Can Imagine
- A garden snail shell is roughly the size of a large grape or a 50p piece
- A giant African snail at full size is roughly the length of your forearm
- The largest known fossil snail was over a metre in diameter
- A microsnail (family Truncatellinidae) fits comfortably on the tip of a pencil
Does Size Affect Tooth Count?
Generally yes — larger snails have longer radulae with more tooth rows, meaning more total teeth. The giant African snail is thought to have one of the highest tooth counts of any land snail species, exceeding 25,000 teeth in large adults.