Calculate reverse tips with our free Reverse Tip Calculator. Extract original bill subtotals from total paid, calculate exact tip percentages, and split group receipts with 100% offline privacy.
Choose Find Original Bill, Find Tip %, Find Total to Pay, or Fixed Tip Subtotal depending on your scenario.
Input the total credit card charge, original bill subtotal, target tip percentage, and group split number.
Instantly view original subtotal, tip percentage/amount, per-person split, and copy calculation summary.
Your receipt data is processed entirely inside your browser using client-side JavaScript. Nothing ever travels over a network to any server — making BunchTool 100% private.
Calculations run locally in real time as you adjust inputs or switch modes. Reverse receipts and per-person splits update instantly without page reloads.
Uses precise inverse mathematics to separate your tip from the base bill subtotal, resolve tip percentages, or calculate exact total payouts.
Reverse Tip Calculation is the process of extracting the original pre-tip bill subtotal from a final credit card charge or receipt payment.
The inverse subtotal formulas are:
\(\text{Original Subtotal} = \frac{\text{Total Paid}}{1 + \left(\frac{\text{Tip \%}}{100}\right)}\)
\(\text{Tip Amount} = \text{Total Paid} - \text{Original Subtotal}\)
\(\text{Tip \%} = \left(\frac{\text{Tip Amount}}{\text{Original Subtotal}}\right) \times 100\)
Standard Tipping Benchmarks: In dining practice, 15% represents fair service, 18–20% represents good standard service, and 25%+ represents exceptional service.