Updated October 22, 2026
This auto repair estimate calculator writes the repair order the way shops bill it, book hours times your labor rate with any discount, parts with your markup, shop supplies as a percent of labor with a cap, and sales tax at the rate you enter. Then it shows what the order is worth to the shop: the effective labor rate, the tech's actual time against book time, and gross profit on labor, parts and the whole ticket.
Quick answer: Labor = book hours × labor rate × (1 − discount). Parts = parts cost × (1 + markup). Shop supplies = labor × supplies %, up to the cap. Total = labor + parts + supplies + tax on the taxable items you choose. Effective labor rate = labor ÷ book hours billed; labor gross profit = labor − tech pay.
An estimate from the numbers you entered, not a market price. Put in your own costs for a number you can stand behind.
Home service businesses answer only about half their calls (Invoca, July 2026), and owners spend about 11 to 16 hours/week on admin. Pricing is the easy part; the money leaks out in the calls you can't take, the quotes nobody chases and the invoices that sit unpaid. Unmanually is a 24/7 AI Office Manager for auto repair shops that you run by voice from your phone:
Sources: Invoca, July 2026 (52% of home-service calls answered by a person, 60M+ calls); admin hours: Time etc / Censuswide 2023 and Amex SME Barometer 2026.
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labor = book hours × labor rate × (1 − discount)parts = parts cost × (1 + markup)shop supplies = labor × supplies %, no more than the captotal = labor + parts + supplies + tax rate × (parts + supplies, + labor if taxable)effective labor rate = labor ÷ book hours; tech efficiency = book hours ÷ actual hoursgross profit = (labor − tech pay) + (parts price − parts cost) + shop supplies
These are assumptions for illustration, not market rates. No sales tax is included; enter your own rate.
A 2.5 book-hour job at a $140 posted labor rate with no discount, $180 of parts at 50% markup, shop supplies at 6% of labor capped at $40, and a flat-rate tech paid $30 per flagged hour who finishes in 2 actual hours.
Labor is 2.5 × $140 = $350. Parts sell for $180 × 1.5 = $270. Shop supplies are 6% of $350 = $21. The repair order total is $641 before tax. The effective labor rate is $140 per billed hour, or $175 per actual tech hour, and the tech ran at 125% efficiency. The tech earns 2.5 × $30 = $75, so labor gross profit is $275 (78.6%), parts gross profit $90 (33.3%), and the order's gross profit is $386, 60.2% of sales before tax.
Give a 10% labor discount and the effective labor rate drops to $126, and gross profit to $348.90.
Most shops bill labor from a labor guide: book hours times the posted rate, whatever the clock says. Fast, well-equipped techs beat book time and make the shop more per actual hour; diagnostic time, rust and broken bolts can make jobs run long. Track both, job by job.
The posted rate is what you advertise; the effective labor rate is what you actually collect per billed hour after discounts, coupons, goodwill and comebacks. A shop with a high posted rate and frequent discounts can earn less per hour than a shop with a lower rate and none. Watch it every month.
Many shops use a parts matrix: higher markups on cheap parts, lower on expensive ones. Whatever you use, know the gross profit it gives on parts. A 50% markup is a 33.3% margin. Quoting customer-supplied parts usually means no parts profit and no warranty, so price the labor accordingly or decline.
Rags, cleaners, small hardware and disposal are real costs. Many shops charge them as a percent of labor with a cap and show it on the invoice. Sales tax rules for parts, labor and supplies differ by state; check yours and set the calculator to match.
Flat-rate techs are paid on book hours, hourly techs on the clock. Efficiency (book hours ÷ actual hours) tells you how fast work moves through the bays. Labor gross profit after tech pay is what pays the service writer, the rent and the lifts.
Every repair order waits on a customer's yes. Calls about estimates and pickups pile up while the service writer is at the counter. Fast approvals keep bays full and tickets moving.
Drivers with a warning light call shops until one can look at the car today. Unmanually is an AI Office Manager that works 24/7 and that you run by voice: the AI Office Manager answers, asks the year, make, model, symptom and when they can drop it off, books the appointment and texts the confirmation, calls back for estimate approvals, then sends the invoice and chases it. See what Unmanually does for auto repair shops, or get a free website that calls every new lead back in about a minute.
What the AI Office Manager does for shops, from appointment calls to estimate approvals.
Parts markup and matrix pricing in more depth.
Answering calls while the service writer is at the counter.
Pricing calculators and templates for every trade.
Most multiply the book hours from a labor guide by the shop's posted labor rate, minus any discount. In the example, 2.5 hours × $140 = $350.
Labor sales divided by the hours billed, after discounts, coupons and goodwill. It is usually lower than the posted rate, and it is the rate that pays the bills.
It varies, and many use a matrix with higher markups on cheaper parts. Whatever you use, check the margin: a 50% markup is a 33.3% gross margin on the part.
A charge for consumables like rags, cleaners and small hardware, often a percent of labor with a cap. The calculator applies your percent and cap.
Book hours divided by the hours the tech actually spent. 2.5 book hours done in 2 hours is 125% efficiency.
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