Reverse Tip Calculator – How to Find the Original Bill Before Tip

A reverse tip calculator helps you figure out the original bill amount before a tip was added, based on the total bill and the tip percentage. This is useful when you know how much you paid in total but need to work backward to find the base bill and the exact tip amount.

Formula 1: Original Bill (Before Tip)

$\text{Original Bill}=\frac{\text{Total Bill}}{1+\frac{\text{Tip \%}}{100}}$

Formula 2: Tip Amount

$\text{Tip Amount}=\text{Total Bill}-\text{Original Bill}$

Example Calculation

Let’s say you paid $115 in total, and you know the tip percentage was 15%.

Step 1: Find Original Bill

$\text{Original Bill}=\frac{115}{1+\frac{15}{100}}=\frac{115}{1.15}=100$

Step 2: Find Tip Amount

$\text{Tip Amount}=115-100=15$

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Final Answer:

• Original Bill: $100
• Tip Amount: $15