4-7 inches depending on what speices
size is not an accurate way to tell age of a turtle do to the fact that if the turtle is kept in poor conditions ie without light in a very small enclosure not eating correctly or if it is sick... but from my opinion a quarter sized turtle is about 5 weeks old.
A female painted turtle weighs about 500 grams. A male painted turtle weighs about 300 grams.
dude it depends on the turtle!!! and a baby turtles gonna get to be the size of an adult turtle A baby turtle is about 1-3 inches. An adult turtle let's say red ear sliders are about 10 inches or bigger.
about the size of a quarter
the awnser is to look how big its spieces is and see how big it is.
about ten inches
Keeled box turtle grows to About seven inches
It is 12 inches or 30 cm.
10 to 12 inches....
10-12.5 inches normally
Eastern Painted Turtles reaches up to 7-8", though natural intergrades with Midland Painted ancestry can get larger.