A price calculator program in Python: your formula, options and markups in a window that gives a price quickly

Example result

def update_total(self, *_):
    """Adds up the lines and the tax and shows the total under the table."""
    subtotal = sum(line.hours * line.rate for line in self.lines)
    tax = round(subtotal * self.tax_rate.get() / 100, 2)
    self.subtotal_label.config(text=f"Subtotal: {subtotal:,.2f}")
    self.tax_label.config(text=f"Tax: {tax:,.2f}")
    self.total_label.config(text=f"Total: {subtotal + tax:,.2f}")

About this service

When every quote is worked out by hand or in a fragile spreadsheet, prices drift and mistakes slip in. This program puts your own pricing rules in one window: you enter the job, such as size, quantity, material and options, and it shows the price with your markup, discounts and tax, line by line. From Standard your rates live in a CSV or SQLite file, so you change a price without touching the code; in Premium quotes are saved and exported to a file for the customer, and an error log is kept. Send us the formula you use now with two or three examples worked out. We write it in Python with Tkinter, with a README. The program uses only the rules and prices you give: it does not set prices for you, check the market or connect to your shop or website.

What is included

• What you getA ZIP archive with the Python code, a README on installing Python, running the program and building an .exe, and an example rates file; the code is also shown on the order page. From Standard, rates and materials kept in CSV or SQLite; in Premium, saved quotes exported to a file and an error log.
• Your formulaExactly the rules you use
• Line by lineSee how the price is made up
• Rates in a fileChange prices without code, from Standard
• Quotes for customersSaved and exported, in Premium
• Readable codeWith comments, easy to change later

How it works

1. 1
   TaskYou send your formula and worked examples
2. 2
   CodeWe write the program and the README
3. 3
   Try itYou check it against real jobs on your computer
4. 4
   ChangesYou ask for changes within your package and send any error message

What we need from you

Your pricing rules in words or as a spreadsheet: the inputs (size, quantity, material, options), the rates, markups, discounts, minimum order, rounding and tax, plus two or three jobs worked out with their correct price so the program can be checked against them. What the window should show and save, your system (Windows, macOS or Linux) and whether you want an .exe.

We will ask you:

• What do you price?
• Your formula
• Worked examples
• What should it show or save?
• Which system will it run on?

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Questions and answers

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