1
Pick your calculator
Choose from eight tools covering rent, bills, travel, childcare, restaurants, and more.
✓ Free fair share calculators
50/50 is rarely
fair.
Eight free calculators for rent, utilities, restaurant bills, group travel, childcare, carbon offsets, and more — so everyone pays exactly what's fair.
🔒 No data stored
⚡ Instant results
👤 No account needed
🇬🇧 UK & global friendly
Process
How SplitLogic Works
Three simple steps to end the arguments and get back to enjoying each other's company.
2
Enter the details
Add the total amount and each person's relevant figure — income, room size, or WFH days.
3
Share the result
Copy the breakdown with one click and send it to the group. No arguments needed.
The tools
Eight calculators for every situation
No signup. No tracking. Just the number.
Fair Share Calculator
Split any bill by income, equally, or by custom ratio.
Room Size Rent Splitter
Split rent fairly based on bedroom square footage.
WFH Utility Adjuster
Split heating, electricity, and internet by WFH days.
Travel Expense Splitter
Divide group holiday and road trip costs fairly.
Tip + Tax Calculator
Split restaurant bills with tip, tax, and uneven orders.
Childcare Cost Splitter
Divide childminder and nursery costs by usage or income.
Time Zone Scheduler
Find overlapping working hours for remote teams.
Carbon Offset Calculator
Estimate flight emissions and how much to offset.
From the blog
Guides, explainers, and honest takes on splitting expenses fairly
Fair Share
Why 50/50 Is Almost Never the Fairest Way to Split Anything
Split rent, bills and groceries by income, room size or custom ratios — and end the 50/50 argument for good.
📖 6 min read
Rent
How to Split Rent Fairly by Room Size (And Stop Overpaying for a Cupboard)
Tired of paying the same rent as your flatmate who has the master bedroom? Two proven methods explained.
📖 5 min read
Utilities
How to Split Utility Bills Fairly When One Flatmate Works From Home
Two proven methods for adjusting household bills when flatmates have different WFH patterns.
📖 5 min read
Travel
How to Split Group Holiday Costs Fairly (Couples, Singles & Selective Dave)
Handle accommodation splits, activity opt-outs, and road trips without post-holiday awkwardness.
📖 6 min read
Relationships
The Psychology of Splitting Bills: Why 50/50 Feels Wrong (And Often Is)
Behavioural science explains why equal splits cause resentment — and what actually makes people feel fairly treated.
📖 6 min read
Dining
Restaurant Bill Calculator: Split the Bill Fairly (With Tip, Tax & the Salad Friend)
How to split restaurant bills when someone only had a starter and someone wants to leave a 25% tip.
📖 5 min read