I am not rude. You only think that because you're an idiot.

[Irving Patrick Freleigh]

You should have just told him that it would be $700/inch.

Even better.

[depechemodefan]

Unfortunately, I would probably say things like"

Me: ok, let's say it's 60 in deep, high, and long. And it weighs 50 lbs. It might run between $35-70.
SC: how big is that?
Me: ok, let me pull a box on a dolly from the back.
pulls it out.
SC: so how wide is it?
Me: 60 in all around.
SC: how long is it?
Me: It's 60 in long, tall, and wide.
SC: how wide is it?
Me: 60.
SC: How much was it?
Me: between $35-70. Depends how much it weighs.
SC: That doesn't help me, my box is much smaller than that. Your no help! Who would bring a box that big to the post office!