Split anything fairly.
Calculate rent, utilities, vacations, dinner bills, group gifts, and shared expenses in seconds.
No spreadsheet required. No sign-up. No awkward math.
One calculator, every kind of split.
Pick the situation that sounds like yours — SplitMath adjusts the expense fields automatically.
Living Together
Rent, bills, and groceries split fairly between partners or family.
Split now →Roommates
Rent, utilities, and shared subscriptions without the group-chat math.
Split now →Vacation Rentals
Airbnb cost, cleaning fees, and activities across the whole group.
Split now →Dinner Bills
Food, drinks, tax, and tip — split evenly or by who ordered what.
Split now →Group Gifts
Chip in fairly for a gift, shipping, and wrapping — no chasing Venmo.
Split now →Weddings & Parties
Shared costs for showers, parties, and celebrations, split any way you like.
Split now →Road Trips
Gas, tolls, and snacks — split fairly no matter who's driving.
Split now →Team Expenses
Client dinners, office snacks, or team outings split among coworkers.
Split now →Three ways to split, one clear answer.
Choose the method that fits your situation — SplitMath handles the math and shows you exactly who owes what.
Even split
Everyone pays the same amount. Perfect for dinners, road trips, and groups with similar incomes and usage.
Percentage split
Assign a custom percentage to each person with sliders. Great when usage or responsibility isn't equal.
Income-based split
Enter each person's income and SplitMath calculates a proportional, income-adjusted share automatically.
Whatever you're splitting, here's how to do it right.
Split rent by income calculator
When roommates or partners earn different amounts, splitting rent 50/50 can feel unfair. A split rent by income calculator lets each person contribute a share proportional to what they earn, so nobody is stretched thin while someone else has money left over. SplitMath's income-based split does this instantly.
Roommate expense calculator
Between rent, electric, water, internet, and streaming, roommate bills add up fast — and so does the group-chat math. A roommate expense calculator keeps every shared cost in one place and splits it evenly, by percentage, or by income, so you always know exactly what you owe.
Vacation cost split calculator
Group trips come with a lot of shared costs: the rental, cleaning fees, groceries, gas, and activities everyone chipped in for. A vacation cost split calculator adds it all up and divides it fairly, so you can enjoy the trip instead of settling up with napkin math.
Airbnb cost split calculator
Splitting an Airbnb among friends is easy until someone brings up cleaning fees or taxes. SplitMath's Airbnb cost split calculator breaks down the rental price, fees, and extras, then splits the total however your group agrees — evenly or adjusted for who used what.
Split bills unevenly
Not every situation calls for an even split. Maybe one roommate has the bigger bedroom, or one person didn't join a group activity. SplitMath lets you split bills unevenly with custom percentages, complete with sliders and a live check that everything adds up to 100%.
Dinner bill split calculator
Splitting a restaurant tab gets messy fast, especially with tax, tip, and a coupon thrown in. A dinner bill split calculator adds up food, drinks, shared appetizers, tax, and tip, then splits the total evenly or by however much each person ordered.
Shared expenses calculator
From group gifts to team outings, a shared expenses calculator makes sure every contribution is accounted for and every share is fair. SplitMath works for any group — friends, roommates, coworkers, or family — with no account required.
Make the split make sense
The goal isn't just dividing a number — it's making sure everyone feels good about what they paid. SplitMath shows a clear fairness indicator and a visual breakdown, so the numbers make sense to everyone in the group, not just whoever did the math.
Frequently asked questions
The fairest approach depends on your household. An even split works well when everyone earns similarly and shares the space equally. If incomes differ a lot, an income-based split — where each person pays a share proportional to what they earn — often feels more fair. SplitMath's split rent by income calculator does this math for you automatically.
To split bills based on income, add up each roommate's monthly income, then calculate each person's share as their income divided by total household income. That percentage is applied to the total bill. Enter each person's income into SplitMath's income-based split and the calculator handles the rest.
List every shared cost — the rental, cleaning fee, taxes, groceries, and activities — then decide whether to split evenly or adjust for people who skipped certain activities. SplitMath's vacation rental split calculator adds it all up and shows what everyone owes instantly.
Yes. Fair does not always mean 50/50. SplitMath's custom percentage split lets you assign any percentage to each person — great for couples who split bills unevenly, roommates with different room sizes, or groups where one person used more of a shared service.
Start by listing shared expenses like rent, electric, water, internet, and groceries. Choose a split method — even, percentage, or income-based — and SplitMath's roommate expense calculator will show exactly what each person owes, with a shareable summary you can send to the group chat.
Make the split make sense.
It takes less than a minute to see exactly who owes what.