Everyday math
Tip and bill splitting
Calculate an additional tip, including an option to top up an existing gratuity, and split the final bill exactly to cents.
Your inputs
Complete the fields for your selected method. Zero means intentionally zero, not unknown. Currency selection labels amounts; it does not convert exchange rates.
How this calculation works
additional tip = rate × selected base, or max(0, target tip - included gratuity); total = subtotal + tax + other charges + included gratuity + additional tip
Equal shares only. Existing gratuity and other charges must not also be included in the subtotal. Top-up never removes an existing gratuity. Other charges are excluded from the tip base. Cent allocations sum exactly to the rounded bill total; this is not a wage, tax or tipping rule.
What information do I need?
Use records for the same job, equipment or accounting period. Only the fields for your selected entry method are required. An unknown amount is not zero.
Input definitions and where to find them
- Bill subtotal before tax and gratuity (selected currency): Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
- Actual tax amount shown on bill (selected currency): Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
- Other charges excluding gratuity (selected currency): Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
- Gratuity already included on bill (selected currency): Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
- Tip or target total gratuity rate (%): Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
- Tip calculation base: Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
- How should the tip be added?: Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
- People splitting equally (people): Use matching records or a clearly stated assumption for the indicated period. Prefilled figures are illustrative. An unknown value is not zero.
Use the Where to find this value controls beside the inputs for available work-it-out helpers. Estimates remain your assumptions; a helper does not verify the source figures.
Worked example
Example amounts use US dollars (USD).
Example answer: Final bill including gratuities is $128.00 for the illustrative inputs below.
Example inputs
- Bill subtotal before tax and gratuity: $100.00
- Actual tax amount shown on bill: $8.00
- Other charges excluding gratuity: $0.00
- Gratuity already included on bill: $0.00
- Tip or target total gratuity rate: 20.00 %
- Tip calculation base: Subtotal before tax
- How should the tip be added?: Top up included gratuity to target rate
- People splitting equally: 3 people
- Final bill including gratuities
- $128.00
- Additional tip to add
- $20.00
- Total gratuity including existing amount
- $20.00
- Base share per person
- $42.66
- People paying one extra cent
- 2 people
- Share for those paying an extra cent
- $42.67
- People paying the base share
- 1 people
These illustrative values are not recommended rates or industry averages. Replace every example input with your own figures.
Use the result well
Calculate an additional tip, including an option to top up an existing gratuity, and split the final bill exactly to cents.
Keep inputs on the same scope and time basis. Calculations retain precision internally; displayed values generally round to two decimal places, with extra precision for very small values and whole-unit rounding where required. Economic comparisons describe your supplied assumptions and do not guarantee future results.
This tool provides business arithmetic. It does not approve engineering designs, establish legal or tax treatment, select equipment or certify safe operating conditions.