The short answer: An average adult frog weighs about 20 to 200 grams (0.7 to 7 oz), though tiny species weigh under a gram and the goliath frog exceeds 3 kg.
Frog weight by type
Weight varies enormously by species. Here are representative examples.
| Type (example) | Typical weight |
|---|---|
| Tiny species (e.g. Paedophryne) | Under 1 g |
| Tree frog | About 5 to 30 g (0.2 to 1 oz) |
| Common / leopard frog | About 20 to 90 g (0.7 to 3.2 oz) |
| American bullfrog | About 300 to 800 g (0.7 to 1.8 lb) |
| Goliath frog | About 3.3 to 3.6 kg (7.3 to 7.9 lb) |
What affects frog weight
- Species. The dominant factor, spanning under a gram to over 3 kg.
- Sex. Females are often larger than males.
- Age. Frogs grow steadily after metamorphosis.
- Habitat. Food supply shapes adult body size.
- Season. Body condition changes with feeding and breeding.
How frog weight compares
A common frog weighs about as much as a small egg, while a goliath frog can weigh as much as a newborn human baby.
Frequently asked questions
How much does an average frog weigh?
Most common frogs weigh about 20 to 200 grams, though sizes vary widely by species.
What is the heaviest frog?
The goliath frog is the heaviest, weighing up to about 3.6 kg (7.9 lb).
What is the smallest frog?
Some species weigh under a gram and measure under 1 cm, among the smallest vertebrates.
