Battery charger amp class calculator
Match battery amp-hours to an 8, 20, or 35 A smart charger using a C/10 starting current.
Automotive calculators and tools
Compare garage tools for vehicle lifting, engine hoists, jump starters and winches. Find the calculator suited to your vehicle and task.
Choose a tool
Bottle jack capacity calculator
Estimate a bottle jack capacity class from vehicle gross weight.
Brake bleeder tank calculator
Size a brake fluid pressure bleeder by estimated flush volume across 2, 3, and 5 L tank classes.
Cordless impact ft-lb class calculator
Match fastener breakaway torque and rust factor to a 280 or 900 ft-lb cordless impact shopping class — or NO_MATCH when the job exceeds this ladder.
Engine hoist boom capacity
Check engine and attachment weight against the capacity at a selected boom position.
Engine stand capacity calculator
Size a rotating engine stand by dressed engine weight plus extras with a 1.25 margin across 750, 1,300, and 1,500 lb classes.
Floor jack sizing calculator
Estimate a floor jack capacity class from vehicle gross weight.
Fuel transfer pump GPM calculator
Match tank gallons and fill time to a 10, 15, or 20 GPM fuel transfer pump — gasoline skips diesel-only 10 GPM.
Grease gun PSI calculator
Size a manual grease gun by required fitting pressure across 6,000, 8,000, and 10,000 PSI classes.
Induction bolt heater size calculator
Estimate magnetic induction bolt-heater watt class from fastener diameter and rust severity.
Jack stand capacity calculator
Estimate a support stand pair capacity class from vehicle gross weight.
Jump starter sizing tool
Compare jump starter classes using engine displacement and fuel type.
Loading ramp capacity calculator
Match equipment weight to a 1000, 1500, or 2000 lb published loading-ramp pair rating.
Mechanic creeper capacity calculator
Estimate a mechanic creeper capacity class from body weight plus tools on the creeper.
Motorcycle lift capacity calculator
Size a motorcycle lift from curb weight plus accessories with a 25% margin against 1100 and 1500 lb classes.
Oil drain pan capacity calculator
Estimate an oil drain pan capacity class from engine oil fill and oil-change job count.
Oil extractor tank size calculator
Match sump quarts, drains before empty, and freeboard to a 6.5 or 15 L vacuum oil extractor — or NO_MATCH when the job exceeds this ladder.
Parts washer capacity calculator
Match longest part length, batch size, and soil type to a 5 or 40 gal recirculating parts washer — or NO_MATCH when parts exceed the shop ladder.
Porta-power kit by required tons
Map required push/pull/lift force and duty (ram vs spreader) to a 4 / 10 / 12 ton porta-power kit — or NO_MATCH above the ladder and for spreader loads over ~0.5 ton.
Strut compressor by spring OD
Match measured coil spring outside diameter to a 6.7 / 7.9 / 11.5 in max-OD strut compressor class — or NO_MATCH below 2.8 in or above 11.5 in.
Tire overall diameter calculator
Estimate overall tire diameter from metric size code (section width, aspect ratio, and rim diameter).
Trailer tongue jack capacity calculator
Estimate a trailer tongue jack capacity class from tongue weight.
Transmission jack capacity calculator
Combine unit and saddle extras to compare hydraulic transmission jack capacity classes.
Winch capacity calculator
Estimate required rated line pull using vehicle gross weight and terrain.
Use the right vehicle information
Vehicle weight, engine displacement and attachment geometry answer different questions. Start with the relevant specification from the vehicle or equipment documentation before selecting a tool.
- Check rated capacity at the actual configuration, including an engine hoist's selected boom position.
- A lifting jack and support stands serve different purposes; do not treat them as interchangeable.
- A preliminary sizing result does not replace manufacturer instructions or a safe working procedure.