Seven questions, no form
Put a number on it yourself.
Most operations can tell you what they delivered. Very few can tell you what it costs them to prove it afterwards. This works that out from your own figures, shows every step of the arithmetic, and sends nothing anywhere.
Answer all seven and the arithmetic appears here — 7 to go. Your figures stay in this browser; there is no form, and nothing you type is sent anywhere.
What a statement of that number looks like — a worked example, one page