Everyday Calculators
Split Bill Calculator
Allocate an entered bill equally or proportionally with user-entered tax, tip, service rates, and display-rounding notes.
Enter the values and review the result.
User-entered bill allocation
Rates are optional arithmetic adjustments. No tax, tip, service-charge, or payment recommendation is supplied.
Blank adjustment rates mean 0%. The result is an arithmetic estimate, not a legally correct tax allocation or payment-settlement instruction.
Enter split details, then calculate.
Formula and transparent derivation
Tax, tip, and service charge each equal the base subtotal multiplied by their entered rate divided by 100. The final total is base subtotal plus those three independent adjustments.
Equal mode divides the exact final total by people. Proportional mode divides each participant subtotal by the combined subtotal, then multiplies that fraction by the exact final total. No intermediate display rounding is used.
Worked examples
Proportional example: Alice enters USD 30.00 and Bob USD 70.00. With user-entered tax 8%, tip 10%, and service charge 5%, the combined subtotal is USD 100.00, adjustments are USD 8.00, USD 10.00, and USD 5.00, and the final total is USD 123.00.
Alice is 30% of entered subtotals, so her share is 123 x 0.30 = USD 36.90. Bob is 70%, so his share is 123 x 0.70 = USD 86.10. Raw copy is Alice: USD 36.90
Bob: USD 86.10. These values are illustrative arithmetic, not payment instructions.
Equal example: A USD 100.00 base with 8% tax, 10% tip, and 4 people produces USD 123.00 / 4 = USD 30.75 per person.
Assumptions and limitations
Subtotals and rates are user-entered. This tool does not calculate discounts, coupons, item-level tax, excluded items, currency conversion, payment fees, or transfer settlement. It does not validate tax or tip validity. Displayed cents can differ from an independently displayed final total because each share is rounded only for display.
Related bill tools
Use the Tip Calculator for one entered tip and a per-person arithmetic result, or the Percentage Calculator for general rates.
Quick answers
What this calculator answers
- Equal split: Divide one entered bill total equally among a required whole-number people count.
- Proportional split: Allocate an entered final total in the same proportions as participant subtotals.
Transparency note
Accuracy and limitations
Calzivo tools are built for practical estimates, conversions, and checks. Some tools use standard formulas or simplified assumptions, and results can be affected by input accuracy, rounding, units, local rules, or changing official requirements.
Results depend on the values you enter and any simplified assumptions used by the tool. Verify important results before making decisions or submitting official information.
How to Use This Tool
Use these steps to enter the right inputs and interpret the result correctly.
Choose equal split or proportional split.
Enter the subtotal and any tax, tip, or service-charge rates yourself.
For proportional mode, enter the participant count and each subtotal.
Calculate, then review the exact arithmetic and any display-cent notice.
Related Tools
Other helpful tools in the Everyday Calculators category.
Tip Calculator
Calculate a user-entered tip, tax method, total, and per-person arithmetic without a tipping recommendation.
Sales Tax Calculator
Calculate sales tax, price after tax, pre-tax price, and checkout totals from an entered rate.
Percentage Calculator
Calculate percent of a number, reverse percentages, known-rate adjustments, percentage change, and percentage difference.
Discount Calculator
Calculate savings, discounted price, and final price after an optional user-entered tax rate.
Related Guides
Background reading and explanations related to Split Bill Calculator.
Split Bill Calculator Guide: How to Divide a Bill Fairly
Learn how a split bill calculator divides restaurant bills, tax, tip, shared items, itemized orders, and per-person totals fairly.
How to Split a Restaurant Bill Fairly
Learn how to split a restaurant bill fairly with tax, tip, shared plates, alcohol, service charges, and uneven orders.
Frequently Asked Questions
Common questions about Split Bill Calculator and how to read the result.
Does proportional mode settle payments?
No. It is an arithmetic allocation based only on the subtotals you enter. It does not determine who owes whom or guarantee card-charge reconciliation.
Are tax, tip, and service charge compounded?
No. Each entered rate is calculated independently from the base subtotal, then added to the base subtotal.
Why can displayed participant shares differ from the final total by a cent?
Each exact share is rounded only for display. The tool shows a notice when the displayed shares do not sum to the independently displayed final total.
Can a participant subtotal be zero?
Yes. A zero participant subtotal receives a zero proportional share, but the combined subtotal must be greater than zero.