ive just weighed my tortoise since getting her on tuesday and tried to compare her to that jackson ratio thingy.
she is only 9 mnths old, hermann
length under is 6cm
length over is 7.5 cm
and she weighs 67g or 2 1/4oz

please help as i want the best for my tortoise and need to know if she is under/over weight
because if i go by the length under she is overweight and if i use length over she is drastically underweight

I'm assuming by over you are measuring along the curve of the carapace. If so this will give a false reading. The length under I assume is either straightline or along pastrom. At 6cm straightline I believe you want a weight between 150gm & 200gm. At 7.5cm you would want the same range. This is how I read the the graph. I have never used this graph before seeing as I keep Geochelone & Manouria genus torts, so if a Testudo keeper has imput that would be great.

hi
i'm not totally sure but i think you may find it more acurate to measure her plastron length as shown on the link below.

http://www.tortoisetrust.org/articles/measuring.htm

Hi Trina,
The Jackson ratio is just a guide. Your weight is just fine for a Hermanns that size, 6cm. Your tortoise is storing up for a growth spurt, which all young tortoises do.

Danny

thank you danny, i did measure my tortoise how it says on the tortoise trust website, but thanks for the advice

just for future does it go by the measure under or over?

Trina here are two sites that tell how to meausre.
http://www.tlady.clara.net/measure.htm
or
as kitty posted
http://www.tortoisetrust.org/articles/measuring.htm

You measure under the tort.

thank you jen