How floor jack sizing works
3/4 GVWR rule, class ladder, and jack-stand safety.
Shop floor jack sizing
Floor jack size calculator
Enter vehicle GVWR. Get the minimum jack rating (GVWR × 0.75), then a 2 / 3 / 4 ton class (4,400 / 6,613 / 8,800 lb) — or NO_MATCH. Always use jack stands.
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Result
Required ≈ GVWR × 0.75 (VEVOR “3/4 rule” screening). Classes: 2 ton = 4,400 lb · 3 ton = 6,613 lb · 4 ton = 8,800 lb. Above 8,800 lb → NO_MATCH. A jack lifts; jack stands hold.
From measurement to decision
Open the full calculator
Same tool with room for examples.
2t vs 3t vs 4t classes
When each class fits — and when none do.
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