An estimate gives a customer a realistic idea of the cost when the job is not fully defined yet. List the work and materials, and the estimated total adds up as you type.
An estimate is your best guess at the cost and can change. A quotation is a fixed price. Use an estimate when you cannot know the final amount yet, as with repairs, building work or hourly jobs.
When the scope is settled, use “Make a quotation” to fix the price, or “Make an invoice” once the work is done.