What This Calculator Does
The Tip and Bill Split Calculator turns a restaurant bill into three useful numbers: the tip amount, the total payment, and how much each person owes when the table splits evenly. It is universal arithmetic, so it works with any currency — just read the results as plain monetary amounts. The default 15% tip reflects a common North-American convention, but you set the rate yourself, which makes the tool handy for travelers visiting countries where tipping is customary.
How to Use It
Enter the Bill Amount, the Number of People sharing it, and your chosen Tip Rate as a whole-number percent (for example, type 15 for 15%). The calculator adds the tip to the bill and divides the total by the number of people. If only one person is paying, the per-person payment simply equals the total.
The Formula Explained
Let \(B\) be the bill, \(N\) the number of people, and \(r\) the tip rate in percent. First the rate is normalized to a fraction, \(r_{\text{Frac}} = r / 100\). Then \(\text{tip} = B \times r_{\text{Frac}}\), \(\text{total} = B + \text{tip}\), and each person pays \(\text{total} / N\). The full per-person formula is:
$$\text{Per Person} = \dfrac{\text{Bill}\left(1 + \frac{\text{Tip Rate}}{100}\right)}{\text{People}}$$Values are kept at full precision internally and rounded to two decimals only for display.
Worked Example
A bill of 120.00 split between 4 people with an 18% tip:
$$\text{tip} = 120 \times 0.18 = 21.60$$$$\text{total} = 120 + 21.60 = 141.60$$$$\text{per person} = 141.60 / 4 = 35.40$$Each diner pays 35.40.
FAQ
Is the tip calculated before or after tax? This tool tips on the full bill amount you enter. If you prefer to tip on the pre-tax subtotal, enter that subtotal as the bill.
What if the split leaves a fractional cent? The calculator does a simple even division. In practice one person may round up by a cent to cover the remainder.
Which currency does it use? None in particular — results are plain numbers, so the math holds for dollars, euros, yen, or any currency.
