→ Calculate fair rent splits based on room size.
Calculate rent based on room square footage while splitting utilities and groceries evenly among roommates. Keep living together transparent and drama-free. No signup required. Completely free.
App Screens
Any of these sound familiar?
Don't let tedious money calculations ruin a great memory.
My room is half the size of the master bedroom, but we pay equal rent...
Set up flexible ratios for the rent alone. You can calculate shared living spaces evenly, while applying custom weights to bedroom square footage to get a truly fair housing split.
We want to split rent proportionally, but utilities evenly. Math is getting confusing.
Apply categories per expense! Assign the 'Area Ratio' category to Rent, and 'Equal Split' to groceries and utilities. FAMI-KAN manages the math seamlessly.
We have 3+ roommates with entirely different room sizes.
No problem. Just assign ratios like 'Room A = 1.0, Room B = 0.8, Room C = 0.6' and the app instantly dictates everyone's fair monthly burden.
How FAMI-KAN Compares
| Spreadsheets / Manual | With FAMI-KAN | |
|---|---|---|
| Splitting adults & kids | Difficult & awkward | Automatic by custom ratio |
| Tracking multiple receipts | Easily lost or confusing | Shared ledger link (Real-time) |
| Settling debts | Countless micro-transfers | Optimized 1-tap transfer route |
Simple 3-Step Guide
No app downloads or accounts needed.
Create & Set Ratios
Create an event instantly. Set weighted ratios for adults, kids, or specific members.
Enter Expenses
Share the URL. Everyone can enter their out-of-pocket expenses or deposit pool contributions.
Settle Instantly
The system auto-calculates the net settlement, minimizing the number of transactions.
Why FAMI-KAN is Best
In shared apartments and co-living spaces, it is a common source of resentment when bedrooms differ significantly in size or sunlight exposure, yet everyone pays the same rent. FAMI-KAN solves this by letting you assign area-based ratios to each room — for example, Room A (10㎡) at 1.0, Room B (6㎡) at 0.6 — so that rent alone is proportionally divided by square footage. Meanwhile, utilities, cleaning supplies, and shared groceries can be set to an even split (1:1) among all housemates. This flexible per-expense category system means you can apply different splitting rules to different cost types within the same event. Every personal out-of-pocket payment is recorded and automatically offset against each person's share, so the complex monthly reconciliation of a multi-roommate household is completed in seconds. No spreadsheets, no arguments — just fair, transparent numbers that everyone can verify on their own phone.
Why we built FAMI-KAN
At the end of a fun trip, the worst part is figuring out who owes what. Pulling out receipts, calculating, and remembering who paid for what brings a cold, administrative feel to great memories.
Existing split-bill apps are useful, but often too complex or force everyone to download an app. We wanted something simpler and more welcoming.
FAMI-KAN is not just a calculator. By letting the system handle the math, you can focus on the fun conversations and memories. It's a partner that preserves the joyful afterglow of your events.
Frequently Asked Questions
Yes, all features are 100% free forever. No registration required, and no hidden premium plans.
No. It runs entirely in your web browser. Just share the link and everyone can access it immediately on their phones.
Yes, you can select the currency when creating an event (supports 36 currencies). You can unify calculations easily for trips abroad.