You and your flatmate earn different amounts. The rooms are different sizes. One of you works from home three days a week and cranks the heating.
And yet… you're still splitting the rent 50/50.
Sound familiar?
Money is the number one source of tension in house shares. Not the dishes. Not the music volume. Money.
But here's the thing: most people don't argue because they're greedy. They argue because fair is hard to define. And when no one can agree on what's fair, the easiest path is to default to 50/50 — even when it makes no sense.
That's where a fair share calculator changes everything.
Let's be honest. 50/50 only works when everything else is 50/50.
If that's you — congratulations. You don't need this article.
For the rest of us, 50/50 isn't fair. It's just easy.
And easy leads to resentment.
Fair doesn't mean equal. Fair means proportional to what each person gets or earns.
There are three common ways to define fair in a house share:
| Method | Best For | Example |
|---|---|---|
| Equal split | Short-term, small amounts | Dinner bill, takeaway order |
| Income-based | Couples or flatmates with big earnings gaps | "You earn £3k, I earn £2k — you pay 60% of rent" |
| Custom Split | Physical differences | Room size, WFH days, grocery consumption |
The right method depends on your situation. And a good fair share calculator lets you toggle between them.
The situation: One room is twice the size of the others. Or it has an en-suite. Or a balcony.
The unfair split: 50/50. The person in the small room pays the same for less space.
The fair split: Custom Split by square footage. Larger room = larger share.
Example: Rent is £1,800.
No resentment. No arguments. Just math.
The situation: One person earns £4,000/month. The other earns £2,000/month. Both want to live in a nice flat.
The unfair split: 50/50. The lower earner spends 40% of their income on rent. The higher earner spends 20%.
The fair split: Income-proportional. Higher earner pays double.
Example: Rent is £1,800.
Both spend roughly the same percentage of their income on housing. That's fair.
The situation: You go to the office 5 days a week. Your flatmate works from home 5 days a week — heating, electricity, internet usage all day.
The unfair split: 50/50 utilities. You subsidise their work-from-home lifestyle.
The fair split: Custom Split by WFH days.
Example: Utility bill is £200.
Now the person using more pays more.
The situation: You're a grazer. They eat like a competitive eater. You split groceries 50/50.
The unfair split: You're paying for their appetite.
The fair split: Track rough consumption or use Custom Split mode with ratios based on meals eaten.
Most people solve this with a spreadsheet. Or a notes app. Or a WhatsApp message that says "I'll work it out later."
Here's why that fails:
A fair share calculator fixes all of this. It's instant, transparent, and lives in your browser.
A purpose-built tool like SplitLogic (free, no signup, no tracking) gives you:
You don't need to download an app. You don't need to share personal data. You just need the link.
Bringing up money is awkward. Here's a script:
Most people will say yes. Why? Because deep down, they know 50/50 isn't fair either.
If they resist, ask one question:
That usually ends the conversation.
House share arguments about money aren't about money. They're about fairness.
And fairness is just math.
A fair share calculator removes the emotion, the guesswork, and the resentment. It gives you a number everyone can see, agree on, and move on from.
So stop guessing. Stop defaulting to 50/50 because it's easy. Try a fair share calculator once — and watch how quickly the money arguments disappear.
You've got better things to argue about. Like whose turn it is to take out the bins.