How liter sizing works
Gas vs diesel ceilings, class ladder, and 12V safety.
12V jump starter sizing
Jump starter size by engine liters
Enter engine displacement (L) and fuel (1=gasoline, 2=diesel). Get the smallest 1000 / 1500 / 4000 A peak class — or NO_MATCH. 12V only; correct clamp polarity; charged pack.
12V jump starter sizing
Result
Match the smallest class where liters ≤ the class limit for that fuel. Classes: 1000A (gas≤5L / diesel≤3L) · 1500A (gas≤6L / diesel≤4L) · 4000A (gas≤10L / diesel≤8L). Above the ladder → NO_MATCH. 12V systems only; correct clamp polarity; pack charged; not for frozen/damaged batteries without manufacturer guidance.
From measurement to decision
Open the full calculator
Same tool with room for examples.
1000 vs 1500 vs 4000 classes
When each class fits — and when none do.
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