Should You Pay by Square Footage? Let's Do the Math

When Jake and I finally sat down to figure out what was fair, we started with the obvious: square footage. It seemed logical. Mathematical. Unarguable. And mostly, it was. But we also learned pretty quickly that square footage doesn't tell the whole story.

How to Calculate Rent by Square Footage

The math is actually simple, which is part of why I like it. No fuzzy feelings, no "well I think my room is nicer" debates. Just numbers.

See? Clean. Objective. Nobody can argue with math. (Well, they can, but they'll look silly doing it.)

But Wait — What About Common Areas?

Here's where it gets tricky. In the example above, we only measured bedrooms. But what about the kitchen? The living room? The bathroom that two people share?

There are two schools of thought:

Method A: Bedrooms Only

Only measure private bedroom space. Everyone splits common areas equally because, theoretically, everyone uses them equally.

Pros: Simple. No measuring the living room.

Cons: If one person never uses the living room (maybe they work nights and sleep during the day), they might feel like they're subsidizing everyone else's Netflix time.

Method B: Total Apartment Space

Measure the entire apartment and assign percentages. Bedrooms count as private space, common areas count as shared space.

For example:

Then you calculate each person's "private" space plus their share of common space. It's more accurate but also more complicated. I've done it both ways and honestly? For most apartments, the bedrooms-only method is close enough.

When Square Footage Falls Short

Here's the thing Jake and I discovered: square footage is a great starting point, but it's not the whole picture.

Consider these scenarios:

• Room A: 150 sq ft, interior room, no windows, shares a wall with the elevator shaft
• Room B: 140 sq ft, corner room, two windows, quiet street view

By square footage, Room A should cost more. But would YOU pay more for a windowless room next to an elevator? Didn't think so.

Other factors that square footage ignores:

• Natural light: A room with good windows is worth more than a cave
• Noise level: Facing the street vs. facing the courtyard
• Proximity to bathroom: The person next to the shared bathroom hears everything
• Closet size: A walk-in vs. a "closet" that's basically a shelf
• Private bathroom: Worth $100-200/month easily

The "Adjustment Factor" Method

After Jake and I did the square footage math, we realized his room was objectively better in ways the numbers didn't capture. So we added an "adjustment factor."

Here's how it worked:

1. Start with square footage split
2. List all the "extra" features each room has
3. Assign a dollar value to each feature (roughly)
4. Add or subtract from the base rent

Our actual breakdown:

Was it perfectly scientific? No. Did it feel fair? Yeah, actually. The key was that we talked through each adjustment and both agreed on the values. If one person just dictates the numbers, it won't work.

What About the "I Don't Care About Space" Person?

Every apartment has one. The person who says "I don't need a big room, I just need a bed." They want the smallest room and they want to pay less for it.

This is actually great — if they're genuinely okay with less space. Problems arise when:

• They take the small room to save money, then complain about it for 12 months
• They turn the living room into their second bedroom because their actual room is too small
• They have a significant other who basically lives there and needs space too

My rule: Take the room you actually want, not the room you think you should want to save money. A miserable roommate costs more than an extra $100/month in rent.

Bottom Line

Square footage is the best starting point for splitting rent because it's objective. But it's just a starting point. The real work is having an honest conversation about what each space is actually worth to the people living in it.

And if you're the person with the bigger room? Offer to pay more before anyone asks. It's a small gesture that builds goodwill for all the future conflicts you're definitely going to have about dishes.