Free auto repair shop calculators and VIN tools

Work out your effective labor rate (labor sales ÷ billed hours), compare it with your posted rate and see labor dollars per paid …

Convert parts markup to margin and back, then build a tiered parts matrix and price any part cost with gross profit. Free, runs i…

Work out a repair order's gross profit and GP% for labor, parts, sublet and fees, using your tech's pay and real parts cost. Free…

Calculate technician efficiency (flagged ÷ clocked hours), productivity (clocked ÷ available) and overall for each tech and the t…

Estimate monthly and yearly shop revenue from car count, average repair order and working days, with what-ifs: one more car a day…

Find your shop's break-even sales and car count: fixed costs ÷ gross profit %, then ÷ ARO and working days. Add a profit target. …

Enter a tire size like 225/45R17, LT265/70R17 or 33x12.50R15 to get diameter, sidewall, width, circumference and revs per mile, a…

See your real speed after a tire size or axle ratio change: actual vs indicated speed at 30 to 80 mph, and the odometer error. Fr…

Decode any 17-character VIN: check digit, model year, make, model, trim, body, engine, drive and plant, from NHTSA's free vPIC da…

Decode a VIN and list NHTSA safety recalls for that year, make and model, with component, risk and remedy. Or search by year, mak…

Convert torque specs between newton-meters, foot-pounds, inch-pounds, kgf·m, kgf·cm and ozf·in with exact NIST factors. Free, run…

Convert wheel offset to backspacing and back, then compare a new wheel with the current one: how much closer to the strut and how…

Type the DOT code from the sidewall to see the week and year the tire was made, the exact dates of that week and its age today. C…

Look up any tire load index from 60 to 150 in pounds and kilograms, decode speed ratings in mph and km/h, and see a P-metric tire…

Work out engine RPM at any speed from axle ratio, gear and tire diameter, the speed at an RPM, and the axle ratio that restores R…

Enter bore, stroke and cylinders in inches or millimeters to get engine displacement in cubic inches, cc and liters, per cylinder…

Static compression ratio from bore, stroke, chamber cc, piston dome or dish, head gasket and deck clearance, plus the chamber cc …

Turn torque and RPM into horsepower, horsepower into torque, and convert hp, kW and metric hp (PS) with NIST factors. Free, runs …

Compare a tech's flat-rate pay (flag hours × rate) with hourly pay for the same week, with the effective hourly rate, minimum wag…

A service advisor's monthly pay: base plus commission on labor and parts gross profit or on total sales, a tiered bonus, and pay …