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Measure before you choose

Is this litter box long enough for your cat?

Start with your cat’s measurements, then compare a box you own or are considering. This worksheet uses a veterinary length guideline. Width, access and your cat’s comfort still need a separate check.

1. Add your measurements

Use the same unit for every measurement

Measure from the nose to where the tail begins. Leave the tail out. Measure while your cat is standing naturally; do not stretch or restrain them.

Schematic cat with measurement from nose to base of tail; the tail is excluded. Not to scale.Nose to tail base • tail excluded
Top view of a rectangular litter box. Measure length and width between the inner walls at litter level, excluding the outer rim. Schematic, not to scale.Inside lengthInsidewidthMeasure usable space. Leave the rim out.
Top view of an open tray. Illustration only, not to scale.

Both box fields are optional. Use the usable interior at litter level, not the outside rim or shipping dimensions. If the manufacturer only lists outside measurements, leave these blank.

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2. Your size comparison

Add your cat’s length to see the reference size.

No box measurements yet? You can still calculate the length to look for.

This is a comparison with a general guideline, not a guarantee of fit or acceptance. It is designed for rectangular trays. Curved walls, covered boxes and automatic litter boxes need additional checks of usable space and access.

What the numbers cannot tell you

  • Turning room: check whether your cat can turn and dig without being cramped. There is no width pass/fail score in this worksheet.
  • Entry and cover: consider the step-in height, doorway and headroom. A long box can still be difficult to enter.
  • Changing needs: growing kittens need remeasuring. Older cats and cats with mobility difficulties may need easier access.

A change in toileting behaviour may have a medical cause. Contact your veterinarian rather than relying on a size result to explain it.

Read the litter-box sizing and setup guide
Compare litter-box options and measurement limits

How this worksheet works

The length reference is your cat’s nose-to-tail-base measurement multiplied by 1.5. The FelineVMA and iCatCare owner handout gives this sizing guidance. We compare it with the usable inside length so a wide rim does not count as space your cat can use. That interior-measurement approach is our implementation of the guideline.

For width we show your measurement, without inventing a numerical threshold. Units convert using exactly 2.54 centimetres per inch. Display values are rounded to two decimals; the comparison uses the unrounded values.

Prepared by Sami Ullah · Sources checked 16 October 2026 · Size comparison worksheet
Measurements are not submitted by this worksheet.