Free Automotive Tools
Interactive calculators, fitment tools, and printable checklists. Built for mechanics, DIYers, and anyone who'd rather check the math once than redo a bad install. No signup, no ads, no analytics — every tool runs on your device.
Bar to PSI Converter
Convert tire pressure between bar, PSI, and kPa live. Door-jamb sticker decoder, common car/truck pressures, severity badge. NIST-exact factor. Reviewed by Mike Reeves, ASE Master Tech.
Open toolWheel Offset Calculator + Visualizer
Compare stock vs new wheel setup with poke/tuck delta, backspacing, plain-English fitment severity, and SVG fender visualizer. Spacer-aware. Reviewed by Mike Reeves, ASE Master Tech.
Open toolTire Height & Diameter Calculator
Compare any two tire sizes — diameter delta, speedometer error %, revs per mile, lift estimate with vehicle presets, and a branded PDF spec sheet. Plus-size helper built in. Reviewed by Mike Reeves, ASE Master Tech.
Open toolTire Diameter Calculator
Get any tire's overall diameter (height) from its sidewall code — metric or flotation — with section height, circumference, and revs per mile. Includes a tire diameter chart and side-by-side compare. Reviewed by Mike Reeves, ASE Master Tech.
Open toolTire Ply Rating + Load Index Chart
Look up any sidewall code or load index — Load Range letter, ply equivalent, max PSI, and capacity in lb/kg. Interactive filter by passenger / LT / trailer / heavy-duty. Live load-index slider, branded PDF, embeddable widget. Reviewed by Mike Reeves, ASE Master Tech.
Open toolRecommended Tire Pressure Lookup
Year/make/model PSI lookup — 100+ US vehicles from owner-manual and OEM tire-and-loading data. Live load + ambient-temperature correction, source link per vehicle, branded PDF spec sheet, embeddable widget. Reviewed by Mike Reeves, ASE Master Tech.
Open toolBolt & Lug-Nut Torque Calculator
Compute tightening torque with the industry T = K × D × F formula for any bolt or wheel-stud size, grade, and lubrication. Live ft-lb / Nm / in-lb display, star-pattern reminder. Reviewed by Mike Reeves, ASE Master Tech.
Open toolLug Nut Torque Chart by Make & Model
Search any car, SUV, or truck for its OEM lug-nut torque spec and stud size — a sortable, filterable reference table plus a stud-size fallback chart, star-pattern reminder, and branded printable PDF. Embeddable. Reviewed by Mike Reeves, ASE Master Tech.
Open toolMetric Bolt Torque Chart
The full M6–M24 chart in Class 8.8 / 10.9 / 12.9. Recomputes live for dry / oiled / anti-seize, one-tap Nm ↔ ft-lb, tap-to-pin spec card, and a branded full-chart PDF. Embeddable. Reviewed by Mike Reeves, ASE Master Tech.
Open toolFt-Lbs to Nm Torque Converter
Convert torque between ft-lb, N·m, and in-lb live in three linked fields. Mechanic-flavored: lug-nut + spark-plug + oil-drain presets, wrench-class chip, branded PDF. NIST-exact factor. Reviewed by Mike Reeves, ASE Master Tech.
Open toolJump Start Order — Animated Diagram
Step-by-step animated jumper-cable connection diagram with 5 scenarios (car-to-car, jump pack, hybrid, EV, motorcycle), 'why this order' callouts on every step, and a printable wallet card. Reviewed by Mike Reeves, ASE Master Tech.
Open toolUsed Car Inspection Checklist
61 ASE-shop inspection points across 9 sections — interactive on your phone in the seller's driveway. Live deal-score, walk-away alerts for title/frame/engine red flags, and a one-page PDF report with your vehicle data. Reviewed by Mike Reeves, ASE Master Tech.
Open toolTowing Capacity Calculator + VIN Lookup
Three ways to find your tow rating — year/make/model presets for 40 popular trucks/SUVs, free NHTSA VIN decode, or manual GCWR/GVWR/curb entry. Live payload + tongue weight, 80% safe-tow zone, branded PDF, embeddable. Reviewed by Mike Reeves, ASE Master Tech.
Open toolToyota Maintenance Schedule
Enter your Camry, Corolla, or RAV4 mileage and see what's due now — oil, plugs, coolant, filters — from Toyota's fixed-interval schedule. The 0W-16 oil catch and 'lifetime' fluid truth flagged. Branded PDF, embeddable. Reviewed by Mike Reeves, ASE Master Tech.
Open toolHonda Maintenance Schedule + Minder Codes
Civic, Accord, CR-V maintenance by mileage with the Maintenance Minder codes (A, B, 1–6) decoded — read exactly what your dash wrench means. Honest CVT-fluid stance. Branded PDF, embeddable. Reviewed by Mike Reeves, ASE Master Tech.
Open toolFord Maintenance Schedule
F-150, Escape, Explorer schedule by mileage and engine — EcoBoost vs 5.0L plug intervals done right, plus the AWD PTU 'lifetime' truth. Intelligent Oil-Life Monitor explained. Branded PDF, embeddable. Reviewed by Mike Reeves, ASE Master Tech.
Open toolMazda Maintenance Schedule
Mazda3 and CX-5 schedule by mileage, straight from the official Scheduled Maintenance table — including the CX-5 Turbo's 40k plug interval and FL-22 coolant. Schedule 1 & 2. Branded PDF, embeddable. Reviewed by Mike Reeves, ASE Master Tech.
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