For more than a year now, two indoor bunnies – Nutmeg (left) and Tila (right) – have been part of our family.

Our bunnies are very inquisitive and get along with each other only MOST of the time. As a result, they spend most of their time in separate, adjacent pens that take up most of our living room, each with her own custom-built 3-story "condo" (the white, wire-mesh, structure at the back):

I wondered how large a space does this "feel" like to them, compared to the humans in the house? To put it another way, if you were to shrink a human down to the size of the bunnies, how large of a house would this feel like?

## Measuring the Pens

First, I needed to figure out how many square feet of space the pens actually take up. The walls of the pens are flexible, so I choose one of the simplest configurations to compute:

The condos take up 14×42" of space per level. 6 levels result in 3,528in^{2} of space.

Each condo has a front porch, which allows the bunnies to climb up or go under, doubling the floorspace provided. Each porch has an additional 196in^{2} of space.

I’ve broken the pen itself into three blocks – A, B, and C.

A: 140 x 33 = 4620in^{2}

B: 76 x 32 = 2432in^{2}

C: 0.5 x 32 x 32 = 512in^{2}

So, the total space is

Floor Space |
Area |

3528 | Condos |

196 | Condo Porch 1 |

196 | Condo Porch 2 |

4620 | Pen Area A |

2432 | Pen Area B |

512 | Pen Area C |

11484 |
Total |

11,484in^{2} works out to 79.8ft^{2}.

## Bunny:Human Ratio

Next I needed a bunny-to-human ratio. I came up with a few possible approaches here.

The first was simply measuring the bunnies’ feet compared to my own. With my shoe on, my foot is exactly 12 inches long. The bunnies REALLY don’t like me touching their feet, let alone measuring them, so I decided to estimate them at 1in long, which gives a nice ratio of 12:1. Converting "human feet" to "bunny feet", then:

12

^{2}/ 1^{2}= x / 79.8x = 79.8ft

^{2}* 144x = 11,491ft

^{2}

So, if we shrank a human to be 5.9" tall (1/12 my current height), would the pens feel like an 11,491ft^{2} home? Possibly, but to me that seems too large.

A second is to compare our relative heights. I’ll use Tila’s dimensions here since she was the more accessible one when I took this photo:

This is probably their most common snoozing positions – the "loaf". When loafed, Tila is 6" tall at her highest point.

I stand 71" tall, which means there is a ratio of 11.8:1 between us. Using the second formula above, we get:

x = 79.8ft^{2} * (11.8)^{2}

x = 11,111ft^{2}

A pleasantly repeating solution, but subjectively it still seems too large.

A third possible approach is to compare the bunny’s __length__ to my height. I walk upright, but bunnies spend virtually all of their time with "four on the floor". When loafed, Tila is 10" long. Compared to my 71" of height, that’s a ratio of 7.1:1. Using the formula above:

x = 79.8ft^{2} * (7.1)^{2}

x = 4,023ft^{2}

So, at the bunny’s scale, their pens are the equivalent to a 4,000ft^{2} home with each bunny getting roughly half of that. Would each pen feel like a 2,000ft^{2} home to a 10" tall person? I think that’s closer to what I was expecting.