Size Guide/Turtle

Turtle Size Guide

Turtles are infamous for outgrowing their tanks. That 4-inch baby Red-Eared Slider can become a 12-inch dinner plate needing a 100-gallon tank. Always know the adult size before buying.

Quick Answer

Browse turtle growth charts and weight ranges below. Use our breed-specific charts to track if your pet is on target.

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5-50 yrs
Growth period
๐Ÿ’ง
10 gal/inch
Tank rule of thumb
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Females
Often larger
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Shell
Measured by length

๐Ÿ“Growth & Size Facts

Tank Upgrade

Plan for the ADULT size. Buying a 10-gallon tank now means buying a 75-gallon one later.

Slow Growers

Tortoises grow slowly but steadily for decades. Sulcatas can reach 100lbs+.

Pyramiding

Lumpy shell growth is permanent and caused by poor humidity/diet during growth phases.

Sexual Dimorphism

In many aquatic turtles, females grow much larger than males.

Frequently Asked Questions

How big do Red-Eared Sliders get?
Males reach 7-9 inches, but females can grow to 10-12 inches.
Do turtles grow to the size of their tank?
MYTH. They will grow until they are stunted, sick, and deformed. A small tank does not limit healthy growth.

More Turtle Resources

Track Your Pet's Growth

Create a free profile for your turtle to log weight checks, set reminders, and see personalized growth charts.

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Trusted sources: AKC Breed Standards ยท AVMA Pet Care