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Indian Number System Converter
license: gpl-3.0

If you get confused converting values between lakhs and crores and lakh crores, this is the tool for you. Enter a number into any of the input boxes, and watch it get converted.

<!DOCTYPE html>
<html>
<head>
<style>
body {
display: table;
font-family: "Helvetica Neue", sans-serif;
margin: 8px auto;
}
input {
border: none;
border-bottom: 1px dashed #888;
text-align: right;
width: 108px;
}
div {
color: #aaa;
margin-bottom: 8px;
}
.indian {
color: black;
}
.unit {
display: inline-block;
margin-left: 8px;
width: 76px;
}
.zero {
font-size: 14px;
margin-left: 8px;
}
</style>
</head>
<body>
<div>
<input type="number" divisor="1"></input>
</div>
<div>
<input type="number" divisor="1e3"></input><span class="unit">thousand</span><span class="zero">3 zeros</span>
</div>
<div class="indian">
<input type="number" divisor="1e5"></input><span class="unit">lakh</span><span class="zero">5 zeros</span>
</div>
<div>
<input type="number" divisor="1e6"></input><span class="unit">million</span><span class="zero">6 zeros</span>
</div>
<div class="indian">
<input type="number" divisor="1e7"></input><span class="unit">crore</span><span class="zero">7 zeros</span>
</div>
<div>
<input type="number" divisor="1e9"></input><span class="unit">billion</span><span class="zero">9 zeros</span>
</div>
<div>
<input type="number" divisor="1e12"></input><span class="unit">trillion</span><span class="zero">12 zeros</span>
</div>
<div class="indian">
<input type="number" divisor="1e12"></input><span class="unit">lakh crore</span><span class="zero">12 zeros</span>
</div>
<script>
const inputs = document.querySelectorAll("input");
inputs.forEach((i0, i) => {
i0.addEventListener("keyup", ({ target }) => {
const v = +target.value * +target.getAttribute("divisor");
inputs.forEach(i1 => {
i1.value = v / +i1.getAttribute("divisor");
});
});
if (i === 0) i0.focus();
});
</script>
</body>
</html>
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