The **Turtle Tank Size Calculator** is a valuable tool that helps pet owners determine the appropriate enclosure size based on the size and number of their turtles.

A 120-gallon tank is an excellent choice for housing larger turtle species, such as red-eared sliders, painted turtles, or even some small to medium-sized aquatic turtles.

- The tank should be at least 6 feet long, 2-3 feet wide, and 12-18 inches deep. This provides ample swimming space and a proper water depth.
- Make sure the tank is structurally sound and can support the weight of 120+ gallons of water, which can exceed 1,000 lbs.

## Turtle Tank Size Calculator

Shell Length | Minimum Tank Size |
---|---|

2 inches | 20 gallons |

3 inches | 30 gallons |

4 inches | 40 gallons |

5 inches | 50 gallons |

6 inches | 60 gallons |

7 inches | 70 gallons |

8 inches | 80 gallons |

9 inches | 90 gallons |

10 inches | 100 gallons |

11 inches | 110 gallons |

12 inches | 120 gallons |

13 inches | 130 gallons |

14 inches | 140 gallons |

15 inches | 150 gallons |

## Turtle Tank Size Chart

Turtle Type | Shell Length | Minimum Tank Size (gallons) |
---|---|---|

Red-eared Slider | 2 inches | 20 gallons |

4 inches | 40 gallons | |

6 inches | 60 gallons | |

8 inches | 80 gallons | |

10 inches | 100 gallons | |

Painted Turtle | 2 inches | 20 gallons |

4 inches | 40 gallons | |

6 inches | 60 gallons | |

8 inches | 80 gallons | |

10 inches | 100 gallons | |

Map Turtle | 4 inches | 40 gallons |

6 inches | 60 gallons | |

8 inches | 80 gallons | |

10 inches | 100 gallons | |

12 inches | 120 gallons | |

Musk Turtle | 2 inches | 20 gallons |

4 inches | 40 gallons | |

6 inches | 60 gallons | |

Mud Turtle | 2 inches | 20 gallons |

4 inches | 40 gallons | |

6 inches | 60 gallons |

## Turtle Tank Size Formula

**Minimum Tank Size (gallons) = Turtle Shell Length (inches) × 10**

For a red-eared slider turtle with a shell length of **6 inches**, the minimum tank size required would be:

**Minimum Tank Size = 6 inches × 10 = 60 gallons**

## What size tank does my turtle need?

As a general rule of thumb, you’ll want to provide about **10 gallons of water per inch of the turtle’s shell length**. So a 6-inch turtle would need a minimum 60-gallon tank.

**Species-Specific Minimums**:

- Red-Eared Sliders: These turtles can grow 8-11 inches long, so they require a tank of at least
**100 gallons**. - Common Musk Turtles: These smaller turtles, which reach around 5 inches, need a
**50-gallon tank minimum**. - Larger Species: Some turtles, like the Sulcata tortoise, can reach up to 30 inches and need
**very large tanks exceeding 200 gallons**.

Turtles need a dry basking area that takes up 25-50% of the total tank space, depending on the species’ preferences.

Turtles do better in longer, wider tanks that provide more horizontal swimming space, rather than tall, narrow tanks.

## How many turtles can fit in a 40-gallon tank?

As a general guideline, a 40-gallon tank can typically accommodate:

**1 adult red-eared slider or painted turtle with a shell length of 4 inches or less****2 juvenile red-eared slider or painted turtles with a shell length of 3 inches or less****1 adult musk or mud turtle with a shell length of 4 inches or less****2-3 juvenile musk or mud turtles with a shell length of 3 inches or less**

**Overcrowding** can lead to **stress**, **aggression**, and **health issues** for the turtles.

## Is 20 gallons enough for a turtle?

A **20-gallon tank** is generally considered the **minimum tank size for a single turtle with a shell length of 2 inches or less**. This tank size is only suitable for very small turtles and may become cramped as the turtle grows.

## How much space do 2 turtles need?

When keeping **two turtles**, it’s recommended to provide a tank size of at least **60 gallons** to ensure they have enough space to move around, swim, and bask comfortably. This tank size allows for **ample space** and helps prevent overcrowding, which can lead to **stress**, **aggression**, and potential **health issues**.

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