How to change the default quantity box to ‘1′ in Magento?

So you want to add a quantity box with default qty 1 next to the “add to cart” button?

Locate:
\app\design\frontend\default\default\template\catalog\product\view

Change the file:
addtocart.phtml

Find and Replace:

<input name="qty" type="text" class="input-text qty” id="qty" maxlength="12" value="<?php echo $this->getMinimalQty($_product) ?>” /></span>

With:

<input name="qty" type="text" class="input-text qty” id="qty" maxlength="12" value="1" /></span>

That’s it.