How Many Litter Trays Should I Have For My Cat? The Definitive Guide

One of the most common mistakes cat owners make is having too few litter trays. This seemingly simple aspect of cat care has enormous implications for your cat's wellbeing, behaviour, and whether they use the tray reliably or eliminate elsewhere.

The number of litter trays you need isn't arbitrary — there's a well-established guideline based on feline behaviour and veterinary best practice. Understanding this rule and how to apply it to your household ensures your cats have adequate facilities and reduces the likelihood of litter tray avoidance and inappropriate elimination.

In this guide, we explain how many litter trays you should have, why the number matters, and how to set them up effectively.

The Golden Rule: One Per Cat, Plus One Extra

The most widely recommended guideline for litter tray numbers comes from feline behaviour experts and veterinarians: provide one litter tray per cat, plus one additional tray.

So if you have:

• One cat: You should have 2 trays
• Two cats: You should have 3 trays
• Three cats: You should have 4 trays
• Four cats: You should have 5 trays

And so on. The extra tray serves as an insurance policy against problems and provides choice and flexibility for your cats.

Why This Rule Exists

This guideline isn't arbitrary — it's based on understanding cat behaviour and how cats use litter facilities.

Territorial Behaviour

Cats are territorial animals. In multi-cat households, more dominant cats may monopolise a litter tray, preventing subordinate cats from using it. Having multiple trays reduces competition and allows each cat to have access to a tray without encountering another cat.

If a subordinate cat has to wait for a dominant cat to finish using the tray, or has to approach the tray whilst the dominant cat is nearby, they may avoid the tray altogether and eliminate elsewhere.

Preference for Choice

Cats prefer having options. Just as humans might prefer multiple bathrooms in a home, cats benefit from having multiple tray locations. This is particularly important in larger homes where a cat in one end of the house might not want to walk to the opposite end to use a single tray.

Cleanliness Preferences

Cats are fastidious and prefer clean trays. In a single-tray household, if the tray is used multiple times before being scooped, it becomes soiled. A cat may then avoid the dirty tray and eliminate elsewhere.

With multiple trays, even if one becomes soiled, the cat has other clean options available.

Avoiding Bottlenecks

In a multi-cat household with only one or two trays, cats can create bottlenecks where cats wait to use the tray, creating stress and tension. Multiple trays reduce this congestion and allow independent access.

Single-Cat Households

Even with only one cat, the guideline recommends two trays. This provides several benefits:

• Cleanliness: If one tray becomes heavily soiled, your cat has a clean alternative
• Flexibility: If one tray is being cleaned or moved, the other is still available
• Preference: Some cats prefer using different trays for urination and defecation
• Placement options: Multiple trays can be placed in different locations, accommodating your cat's preferences
• Insurance: If something happens to one tray, the other ensures your cat always has access

Even a single cat benefits from having choices and backup options.

Multi-Cat Households

In homes with multiple cats, following the "one plus one" rule is particularly important. Studies on multi-cat behaviour show that insufficient litter facilities are a leading cause of inappropriate elimination and litter tray avoidance.

Conflicts and Dominance

In multi-cat households, more dominant cats often monopolise resources, including litter trays. A dominant cat may:

• Block access to the tray and prevent other cats from using it
• Intimidate subordinate cats, causing them to avoid the tray
• Create tension that makes subordinate cats anxious about using the tray

Having multiple trays distributed throughout the home reduces the ability of one cat to monopolise access and allows submissive cats to use the tray away from dominant cats.

When the Rule Might Not Be Enough

In some multi-cat households, even the "one plus one" rule may not be sufficient if:

• There's significant conflict between specific cats
• One cat is very dominant and aggressively guards resources
• Cats have developed a pattern of avoiding each other
• Cats live in different areas of the home and rarely meet

In these cases, you may need additional trays beyond the standard guideline. The principle remains the same: ensure each cat has uncontested access to a tray.

Placement and Location Strategy

The number of trays is only part of the solution. Where you place them matters enormously.

Spread Trays Throughout the Home

Rather than clustering all trays in one location, distribute them throughout your home. In a multi-cat household, this is essential — trays clustered together don't provide the benefit of choice or reduce conflict.

Ideally, place trays in different areas on different floors or different sections of your home. This ensures cats can access a tray without having to traverse the entire home or encounter other cats.

Accessible Locations

Place trays in locations that are:

• Easily accessible: Cats should be able to reach the tray without navigating obstacles or climbing
• Away from food and water: Cats prefer to eliminate away from where they eat and drink. Never place a tray next to food or water bowls
• Quiet and low-traffic: Cats prefer privacy and safety. Avoid high-traffic areas, noisy rooms, or places where the cat might be startled
• Well-ventilated: Good air circulation helps control odours and prevents the litter area from becoming stale
• Easy for you to clean: You'll be scooping and cleaning regularly, so choose locations that are convenient for you

Avoid Dead Ends

Avoid placing trays in corners or dead-end locations where a cat using the tray could be trapped or cornered by another cat. Cats prefer locations where they have escape routes and can see their surroundings.

Placement Examples

In different home layouts, consider:

• Ground floor and upstairs: Place at least one tray on each level so cats don't have to navigate stairs frequently
• Different rooms: Use different rooms or areas (bedroom area, kitchen area, living area) rather than clustering in one spot
• Multiple bathroom locations: If your home has multiple bathrooms, these are often ideal tray locations
• Laundry rooms: Typically quiet, away from main living areas, and easy to clean
• Utility closets or alcoves: Provide privacy whilst remaining accessible

Tray Size and Type Considerations

Beyond quantity, the size and type of tray matter.

Tray Size

The general rule is that the tray should be 1.5 times the length of your cat's body. A tray that's too small forces your cat to position themselves awkwardly or hang over the edges, which creates discomfort and may cause your cat to avoid it.

For larger cats or multiple cats in a household, larger trays are better. Standard trays are often too small for larger breeds like Maine Coons or for situations where cats might prefer not to share space.

Open vs. Covered Trays

Some households mix tray types — offering both open and covered trays. This gives cats choices:

• Open trays: Preferred by many cats because they provide visibility and escape routes. They're easier to clean and monitor
• Covered trays: Some cats prefer the privacy. However, they can feel restrictive to some cats and may feel like a trap

In multi-cat households, offering both types can help — some cats prefer privacy while others prefer openness.

Litter Box Depth

Deep-sided trays are better than shallow ones because they contain litter better and prevent tracking. However, trays that are too deep make access difficult for kittens, elderly cats, or cats with mobility issues.

Consider your cats' ages and mobility when choosing tray depth. For elderly or arthritic cats, shallow trays or ramps may be necessary.

Special Situations Requiring Additional Trays

Some households need more trays than the standard guideline suggests.

Large Homes

In very large homes, multiple trays in each area ensure no cat has to travel excessively. A cat on the third floor shouldn't have to journey to the ground floor to use the only available tray.

Cats Living in Different Areas

If cats have claimed different territories within your home and rarely meet, additional trays in each territory reduce stress and the likelihood of inappropriate elimination.

Elderly or Mobility-Limited Cats

Senior cats or those with arthritis, spinal issues, or other mobility concerns should have trays in easily accessible locations. They may not be able to navigate to a distant tray, making additional strategically placed trays necessary.

Cats With Medical Conditions

Cats with kidney disease, diabetes, or urinary issues urinate frequently. Multiple trays reduce the distance they need to travel and increase the likelihood they can reach a tray in time.

High-Conflict Multi-Cat Households

If there's significant conflict between cats, or if some cats avoid trays due to intimidation, additional trays beyond the standard guideline may be necessary.

Monitoring and Adjusting

The number of trays you start with may not be perfect for your specific household. Be prepared to adjust based on your cats' behaviour.

Signs You Need More Trays

• Your cat is eliminating outside the trays
• Trays are consistently very dirty or overused before you can clean them
• One cat is blocking another cat's access to the tray
• Your cat seems anxious about using the tray
• Multiple cats are waiting to use a single tray

If you observe any of these signs, add additional trays and experiment with placement until the problem resolves.

Observing Your Cats' Tray Use

Pay attention to which trays your cats use, how often, and when. This reveals preferences and helps you understand if placement or quantity adjustments would help. Some cats may clearly prefer certain locations or tray types.

Maintenance Implications of Multiple Trays

More trays mean more maintenance, but this is a worthwhile investment in your cat's wellbeing.

Daily Scooping

With multiple trays, you'll be scooping more frequently. However, this ensures each tray stays relatively clean, which reduces the likelihood of litter avoidance and maintains better home hygiene.

Complete Tray Changes

With multiple trays, complete litter changes can be staggered. You don't need to change all trays on the same day — this distributes the work and ensures fresh litter is always available.

Litter Requirements

Multiple trays require more litter. Budget for the additional litter cost, though spreading changes over time (rather than a single large change) may balance this out.

Litter Quality and Health Monitoring

With multiple trays in use, you have multiple opportunities to observe your cat's urine and faeces, which is valuable for health monitoring.

Changes in urine colour, frequency, or consistency can signal health issues like UTIs, kidney disease, or diabetes. Having multiple trays increases your chances of noticing these changes.

Health-monitoring litter like Litter Sense takes this observation further by detecting changes in urine composition through colour-indicator technology, allowing you to catch health problems even earlier.

Common Mistakes in Tray Setup

Understanding common mistakes helps you avoid them:

• Having too few trays: The most common mistake. Follow the one-per-cat-plus-one guideline
• Clustering trays together: Placing all trays in one location defeats the purpose of multiple trays. Spread them throughout your home
• Placing trays next to food and water: Cats naturally avoid eliminating near where they eat. Keep trays away from food areas
• Placing trays in high-traffic areas: Cats prefer privacy. Avoid busy hallways or living room areas
• Using trays that are too small: Ensure trays are at least 1.5 times your cat's body length
• Infrequent cleaning: Multiple trays only help if they're kept clean. Scoop daily
• Sudden changes to tray setup: Moving trays or changing locations should be done gradually. Cats prefer consistency

Getting the Tray Setup Right

Getting the number and placement of litter trays right is one of the most important things you can do to ensure your cats use them reliably and eliminate appropriately.

The "one per cat, plus one extra" guideline is well-established and proven to reduce litter tray avoidance, inappropriate elimination, and multi-cat conflict. Combined with proper placement, regular cleaning, and the right litter type, this approach sets your cats up for success.

If your cat is already experiencing litter tray avoidance or elimination outside the tray, addressing the number and placement of trays is often part of the solution. For comprehensive information on why cats avoid trays and how to fix it, read our detailed guide on why cats don't use the litter tray and solutions.

Frequently Asked Questions

Do I really need two trays for one cat?

Whilst one cat technically only needs one tray, having two offers significant benefits including backup access, cleanliness options, and flexibility. Two trays is the recommended guideline for single-cat households.

Can I use the same tray for multiple cats?

Technically yes, but it's not recommended. A single tray forces cats to share a resource, which creates competition and stress. Multiple trays are far better for multi-cat households.

What if I don't have space for multiple trays?

If space is genuinely limited, prioritise having trays in different areas of your home rather than clustering them together. If you truly cannot accommodate the recommended number, prioritise cleanliness — scoop very frequently so even fewer trays remain relatively clean.

Should all my trays be the same type?

Not necessarily. Offering different tray types (open, covered, different sizes) gives cats choices and can help if some cats have specific preferences. However, using the same litter type in all trays maintains consistency.

Do I need to place trays in every room?

Not every room, but spread them strategically throughout your home to ensure no cat has to travel excessively. In larger homes, at least one tray per floor is ideal.

What if my cat still avoids the trays even with multiple options?

Multiple trays address one cause of avoidance, but other factors matter too: litter type, cleanliness, location appropriateness, stress levels, and medical issues. If your cat is avoiding trays despite having multiple clean options, consult your vet to rule out medical causes.

How often should I clean trays with multiple options available?

Scoop daily regardless of how many trays you have. With multiple trays, even if one is being cleaned or is particularly soiled, others remain available. Do a complete litter change on a regular schedule (weekly or as needed).

Can I place trays anywhere that's convenient for me?

Convenience for you is a factor, but your cat's preferences and comfort must come first. Choose locations that are quiet, accessible, away from food, and private, even if it's slightly less convenient for you.