Spare Parts Quote and Margin Calculator for Workshops

Spare Parts Quote and Margin Calculator is an offline app (one HTML file in a zip) for a workshop or a parts counter that quotes parts to customers. You keep a parts list with the supplier cost, and a markup for each category such as filters or brakes. A quote picks parts, quantities and discounts, and shows the price and the margin before it goes to the customer.

The problem it removes: Parts are quoted on a guessed markup, a discount is given at the counter, and nobody knows the margin until the month is over. A quote at cost goes out because the supplier price changed. This app prices from cost and a category markup, shows the margin on every line and every quote, and asks for an approval name when the margin is below your minimum.

What is inside:

• Categories with a markup percent, and a parts list with the supplier cost and the list price worked out from it
• Quotes with lines: part, quantity, discount percent and an optional agreed price that replaces the list price
• Margin per line and per quote, in AED and as a percent of the parts sold, with labour and VAT kept separate
• A minimum margin setting: a Sent or Accepted quote below it needs the name of the person who approved
• Statuses Draft, Sent, Accepted and Declined, with a quote shown as expired after its validity days
• A printed customer quote, an internal margin sheet and a printable price list
• Example data you can load in one click, a Start here guide and an Honest limits panel
• JSON backup and restore, CSV export, and CSV import with a check of every row before anything is added

Who it is for: workshops, tyre shops and small parts counters that quote parts and labour to customers and want to know the margin before the quote goes out.

What it is NOT: It does not hold stock, order from suppliers or fetch prices. It is not a job card or an invoice: use the Zeyto garage job card pack for the job itself. Labour has no cost, so margin is worked out on the parts only. Check the VAT rate before you rely on it. It is not legal, tax or accounting advice, it is not connected to any government system, bank or messaging service, and it does not file or send anything by itself. UAE e-invoicing is not part of it.

Your data stays on this device in your browser. Back it up with Export; clearing browser data loses it otherwise.

Verified by us: scripted tests in Chromium (139 checks through the real screens: adding, editing and deleting records in every table, required-field messages, backup then clear then restore, CSV export then import, keyboard order, print layouts rendered to PDF, no horizontal scrolling at 375 and 1280 pixels, no network requests) and an independent recalculation by a separately written Python evaluator of 1821 calculated values (25 randomised rows plus the example data) with 0 mismatches. Safari engine (WebKit): smoke test passed; Firefox: could not be launched. Not tested: Firefox beyond what is stated here, and no real printer was used (print layouts were checked as PDF).