Shop calculators
Free calculators for the owner of a repair shop. There is no account, no email to give and no pop-up.
Parts markup matrix calculator
Works out what a part sells for under a parts matrix, and the margin the matrix makes across a shop's mix of parts.
Labor rate calculator for auto repair shops
Works out the hourly labor rate a repair shop needs to cover its costs and leave a profit, and the rate it is getting for an hour billed.
Gross profit calculator for auto repair shops
Works out a repair shop's gross profit on labor, on parts, on sublet work and on all three together, and shows labor, parts and the overall figure beside a target.
Canadian invoice tax and tire fee calculator
Works out the GST, HST, PST or QST and the new-tire fees on a repair invoice in a Canadian province or territory, and the invoice's total.
Guides
Longer answers that go with the calculators.
How they work
Each calculator is a form. What is typed goes into the page's address and nowhere else, so a result can be bookmarked, shared and printed, and nothing is stored.
Every calculator has a Markdown version at the same address with .md added. It states the formula and one worked example, and does not compute.