Number formatting with 2 decimal places on a textbox populated by a variable [duplicate]

First, add the closing brace for the function definition. Then, use Number#toFixed to get a specific number of decision places in the string representation.

function calculateSum() { if (document.getElementById("unloadedcheck").checked) { document.getElementById("unloadedtotal").value = ( document.getElementById("unloadedrate").value * document.getElementById("unloadedmiles").value ).toFixed(2); } else { document.getElementById("unloadedtotal").value = "0.00"; } }