🦞 Lobster Age Calculator

Estimate a lobster's age from its weight — lobsters grow slowly, roughly 1 pound every 7 years, and the biggest can outlive humans.

Lobster Weight (lb)

⚠️

📊 Your Results

📖 How It Works

Lobsters never stop growing — they molt repeatedly through life, and fisheries biologists estimate age mainly from size, using the rule of thumb that an American lobster gains roughly 1 pound every 7 years, so a 3 lb lobster is about 22 years old and a 10 lb lobster about 71.

Unlike pets, lobsters do not have a fixed 'human years' conversion — instead their age is compared directly to human lifespans, and a 20 lb lobster can be over 140 years old, older than any person alive.

📋 Lobster Weight to Age Chart

Weight (lb)	Estimated Age
1	8
2	15
3	22
5	36
10	71
15	106
20	141

💡 Why It Matters

A Creature That Outlives Us

Lobsters are among the longest-lived animals on Earth — the oldest known lobsters are estimated at over 100 years, with some giants thought to be more than a century old when finally caught.

Conservation by Size

Minimum-size laws protect young lobsters so they can breed for decades. Because a lobster's age tracks its size so closely, size limits are really age limits in disguise — a safeguard for the species.

Age Changes the Story

A huge lobster on your plate is a decades-old survivor, not a fast-growing farm animal. Knowing its estimated age puts a very different — and humbling — perspective on that dinner.