How Big Do African Bullfrogs Get?
Male African bullfrogs reach around 9 to 10 inches and can exceed 2 kilograms, making them one of the largest frogs in the world. Unusually among frogs, males are roughly twice the size of females.
Published adult size figures
| Figure | Value | Notes |
|---|---|---|
| Adult males | Up to around 9-10 in and 2 kg | Unusually, males are the larger sex |
| Adult females | Roughly half male size | Around 4-5 in |
| Rank | One of the largest frogs in the world | Second only to the goliath frog |
Checked September 20, 2026 against the sources at the foot of this page. Where sources differ the range is shown rather than averaged.
Getting there
Fast, on a big appetite
Well-fed juveniles grow quickly. That speed is part of why overfeeding is so common: fast growth looks like success.
The sexes diverge the opposite way from most frogs
In most anurans females are larger. In Pyxicephalus the males are, and by a wide margin.
What that size means in practice
A large adult needs real floor space
A two-kilogram frog is not a small-tank animal. Floor area matters far more than height for a terrestrial ambush predator.
Substrate depth matters as much as area
They burrow and aestivate, so depth of a safe substrate is part of the housing rather than decoration.
Common questions
How big do African bullfrogs get?
Males reach around 9 to 10 inches and can exceed 2 kilograms, making them second only to the goliath frog in size. Females are roughly half that.
Why are male African bullfrogs bigger than females?
It is unusual: in most frog species females are the larger sex. Male Pyxicephalus guard breeding sites and tadpoles, and the size difference reflects that.
How much space does an adult African bullfrog need?
Floor area rather than height, with enough depth of safe substrate to burrow. A two-kilogram terrestrial frog is not a small-tank animal.