How creeper sizing works
Body + tools rule, 300/400/450 ladder, and under-car safety.
Mechanic creeper sizing
Mechanic creeper capacity calculator
Enter body weight and tools/parts on the creeper in lb. Get required capacity (body + tools), then a 300 / 400 / 450 lb class — or NO_MATCH. Never exceed nameplate; flat floor; chock vehicle; creeper is not a jack stand.
Mechanic creeper sizing
Result
Required = body_lb + tools_lb. Classes: 300 · 400 · 450 lb. Above 450 lb required → NO_MATCH. Never exceed nameplate; use on a flat floor; chock the vehicle; a creeper is not a jack stand.
From measurement to decision
Open the full calculator
Same tool with room for examples.
300 vs 400 vs 450 classes
When each class fits — and when none do.
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