# Simple Javascript tip calculator code

javascript tip calculator javascript calculation

Tip is typically calculated as a percentage of the total bill amount that is paid to a service worker such as a server, bartender, or hairdresser, as a way to show appreciation for their service. The exact percentage of the tip can vary depending on the country, region, and service industry, but it is usually between 15% and 20% of the total bill.

To calculate the tip amount, you multiply the total bill amount by the tip percentage as a decimal. For example, if the total bill is \$50 and you want to leave a 20% tip, you would multiply \$50 by 0.20 (or 20/100) to get a tip amount of \$10.

Once you have the tip amount, you can add it to the total bill amount to get the final amount that you will pay. In the example above, the total bill with tip would be \$60 (\$50 for the bill plus \$10 for the tip).

It’s important to note that in some countries and regions, the tip may be included in the bill or service charge, or tipping may not be customary at all. It’s always a good idea to research the tipping culture in the place you’re visiting or the industry you’re using, and to be respectful of local customs.

Here’s a step-by-step tutorial on how to create a JavaScript tip calculator:

## Step 1: Set up your HTML

Start by creating an HTML file and setting up your basic structure. For this tutorial, we’ll create a simple form that allows users to input their bill total and select a tip percentage:

``````<h1>Tip Calculator</h1>
<form>
<div>
<label for="billTotal">Bill Total:</label>
<input type="number" id="billTotal" name="billTotal">
</div>
<div>
<label for="tipPercentage">Tip Percentage:</label>
<select id="tipPercentage" name="tipPercentage">
<option value="0.10">10%</option>
<option value="0.15">15%</option>
<option value="0.20">20%</option>
<option value="0.25">25%</option>
</select>
</div>

<div>
Tip: <span></span>
</div>
</form>

``````

## Step2: Javascript code to calculate the tip amount

Here is some sample code to calculate tip:

``````const billTotal = parseFloat(billTotalInput.value);
const tipPercentage = parseFloat(tipPercentageSelect.value);
const tipAmount = billTotal * tipPercentage;
``````

## Simpler method: Use NittiJS

NittiJS is a simple calculation library. We can use NittiJS to add any calculation to your HTML form.

Here is our form code updated with NittiJS to do the calculation:

``````<h1>Tip Calculator</h1>
<form>
<div>
<label for="billTotal">Bill Total:</label>
<input type="number" id="billTotal" name="billTotal">
</div>
<div>
<label for="tipPercentage">Tip Percentage:</label>
<select id="tipPercentage" name="tipPercentage">
<option r-value="0.10">10%</option>
<option r-value="0.15">15%</option>
<option r-value="0.20">20%</option>
<option r-value="0.25">25%</option>
</select>
</div>

<div>
Tip: <span r-calc="billTotal * tipPercentage" r-format="currency|usd"></span>
</div>
</form>
``````

The `r-calc` attribute provides the formula to calculate the tip. r-format attribute tells it to format the output to be in USD currency format.

## Demo

Here is the working demo:

See the Pen Calculate age HTML Code (Using NittiJS)