How to price a change order on a fixed-price project

Put your quote and the new requests into the calculator to get a message you can send. This is the method behind the number.

Does this upload my project details?

No. Everything is computed in your browser from what you type. Nothing is sent anywhere. The CLI makes no network call.

How is the change order price worked out?

The rate your original quote implies (quoted price divided by quoted hours), plus an optional premium for rush or re-planned work. Each extra request is its hours times that rate, after any free allowance you choose to absorb.

What does it cost me if I just absorb the extra work?

The tool shows it: the extra hours at your implied rate, and how far your effective hourly rate falls once the same fixed price covers more hours.

Is this a contract or legal advice?

No. It produces a plain-language price list you can paste into an email or change-order form. Check your contract for how changes must be approved.

When should I send the change order?

Before the work starts, and in writing. "Can you also…" is the moment the price is still a conversation; after delivery it is an argument. Name the item, the hours, the amount and the schedule impact.

What premium is reasonable?

None for a small add-on you would have quoted anyway. A premium of 10–25% is common when the request interrupts a planned build, needs a re-plan, or has to be done on a short deadline. Say which it is.

Should I include a free allowance?

Decide it before the project, not mid-argument. A small allowance (5–10% of quoted hours) shows goodwill and keeps tiny tweaks from becoming invoices; the calculator uses it up in order before billing starts.