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Catio Size Calculator

Calculate your catio dimensions and materials

Catio Size

36 sq ft

Mesh

204 sq ft

Shelves

4

18 sq ft minimum per cat

Recommended Catio Size

6×6 ft

36 sq ft | 7 ft tall

Mesh Needed

204 sq ft

5 rolls

Lumber

118 lin ft

Interior Features

Shelves / Platforms4
Per Cat Space18 sq ft

Safety Tips

Use Welded Wire Mesh

16-gauge galvanized or vinyl-coated wire keeps cats safe from predators.

Shade & Shelter

Include shaded areas and weather protection for year-round use.

What You'll Need

Dr. Elsey's Ultra Clumping Cat Litter 40lb

Dr. Elsey's Ultra Clumping Cat Litter 40lb

$18-$224.6
View on Amazon
PetFusion Ultimate Cat Scratcher Lounge

PetFusion Ultimate Cat Scratcher Lounge

$30-$404.4
View on Amazon
BestPet 54" Multi-Level Cat Tree Tower Sisal Posts

BestPet 54" Multi-Level Cat Tree Tower Sisal Posts

$40-$654.3
View on Amazon
Dr. Elsey's Ultra Clumping Cat Litter 40lb

Dr. Elsey's Ultra Clumping Cat Litter 40lb

$18-$224.6
View on Amazon
PetFusion Ultimate Cat Scratcher Lounge

PetFusion Ultimate Cat Scratcher Lounge

$30-$404.4
View on Amazon
BestPet 54" Multi-Level Cat Tree Tower Sisal Posts

BestPet 54" Multi-Level Cat Tree Tower Sisal Posts

$40-$654.3
View on Amazon

As an Amazon Associate, we earn from qualifying purchases.

Example Calculations

12 Cats, Freestanding Catio

Inputs

Number of Cats2
Enclosure TypeFreestanding

Result

Catio Size6×6 ft (36 sq ft)
Mesh Needed204 sq ft
Shelves4

2 cats × 18 sq ft = 36 sq ft needed. Side = ceil(sqrt(36)) = 6 ft. Mesh = (6×4×7) + 36 = 204 sq ft.

21 Cat, Window Box

Inputs

Number of Cats1
Enclosure TypeWindow Box

Result

Catio Size5×4 ft (18 sq ft)
Mesh Needed72 sq ft
Shelves2

1 cat needs 18 sq ft. Window box base is 6 sq ft but cat minimum overrides to 18 sq ft. Mesh = (18×4×3) + 18 = 72 sq ft.

Frequently Asked Questions

Q

How big should a catio be per cat?

Plan a minimum of 18 square feet per cat with at least 6 feet of height. Multiple cats need shelves at different levels to create vertical territory.

  • 1 cat: minimum 18 sq ft (3×6 ft or 4×5 ft floor space)
  • 2 cats: minimum 36 sq ft with 4+ shelves at different heights
  • 3–4 cats: 54–72 sq ft with 6–8 shelves and multiple entry points
  • Height matters: 6–7 ft allows for proper climbing structures
  • Include at least 2 shelves per cat for territorial comfort
CatsMin AreaShelvesMesh (sq ft)
118 sq ft2~130
236 sq ft4~200
354 sq ft6~260
472 sq ft8~320
Q

What type of mesh is safest for a catio?

Welded wire mesh in 16-gauge galvanized or vinyl-coated steel with openings no larger than 2x2 inches is the safest choice for outdoor cat enclosures.

  • 16-gauge welded wire: strongest common option, resists predators
  • Maximum 2×2 inch openings to prevent escape and predator entry
  • Vinyl-coated wire lasts longer and prevents rust in wet climates
  • Hardware cloth (1/2" mesh) provides maximum protection from snakes and small predators
  • Chicken wire is NOT safe — cats and predators can tear through it
Q

How much does a catio cost to build?

DIY catios typically cost $200–$1,500 depending on size and materials. Professional installations range from $1,500 to $5,000 or more.

  • Window box catio (DIY): $100–$300 for materials
  • Medium freestanding (DIY): $400–$800 for lumber, mesh, and hardware
  • Large custom catio (DIY): $800–$1,500 for premium materials
  • Professional installation: $1,500–$5,000 depending on complexity
  • Pre-built kits: $300–$2,000 depending on size and brand
Q

Do catios need a roof?

Yes, catios must have a fully enclosed roof to prevent escape, predator entry, and provide weather protection. Cats are excellent climbers and will escape open-top enclosures.

  • Mesh roof: prevents escape and aerial predators (hawks, owls)
  • Solid roof panels provide shade and rain protection
  • Partial solid + partial mesh gives best of both worlds
  • Polycarbonate panels are lightweight and weather-resistant
  • Never leave tops open — cats can climb any height of wire mesh

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Last Updated: Mar 19, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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