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Size calculator library

Pet Size Calculators

Use your pet’s real measurements to choose crates, beds, wearables, carriers, enclosures and everyday equipment.

Pet products labelled small, medium or large can vary widely. These calculators start with measurable dimensions such as body length, chest, neck, height, enclosure space or capacity so the result is tied to the animal and product in front of you.

Popular calculators

  • What Dog Crate Size Do I Need

    Enter dog nose-to-tail-base length, dog floor-to-top-of-head/ears height, and dog shoulder/body width to work out minimum dog crate internal size.

  • What Dog Bed Size Do I Need

    Find minimum dog bed sleeping area from dog nose-to-rump length, dog shoulder width, and extra length for stretching.

  • What Dog Harness Size Do I Need

    Enter dog chest girth behind front legs, dog lower-neck girth, and back length between harness points to work out harness sizing measurements.

  • What Cat Carrier Size Do I Need

    Use your measurements for cat nose-to-rump length, cat standing height, and cat body width to find cat carrier minimum internal size.

  • What Fish Tank Size Do I Need

    Calculate minimum aquarium water volume using number of fish, average adult fish body length, and chosen water-volume-per-length rule.

  • What Rabbit Hutch Size Do I Need

    Use your measurements for rabbit body length, sleeping-zone area multiplier, and number of rabbits to find rabbit hutch minimum sheltered area.

All Pets calculators

Dog Essentials

Dog Home & Travel

Dog Exercise & Cat Essentials

Small Pets, Birds & Aquariums

Aquariums, Reptiles, Horses & Outdoor Pets

Measure first

Leave the movement, comfort and safety allowance required for the specific product. For wearables and model-specific equipment, compare the measurement profile with the current brand size chart before choosing a labelled size.

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