Carry On Capacity Check Calculator

📖 Overview

Most packing mistakes come from checking only one constraint.

This tool verifies remaining capacity for volume and weight at the same time.

Use it to avoid forced gate check fees and repacking stress.

Use these default and higher-pressure example inputs to explore how sensitive this calculator is before using your real numbers.

Checks carry-on feasibility against both airline volume and weight constraints.

The Formula

Remaining Capacity = Limit − Packed Amount (for volume and weight separately)

Bag Capacity	Total carry-on volume allowance
Packed Volume	Current packed space usage
Weight Limit	Airline maximum cabin bag weight
Packed Weight	Current packed bag weight

💡Passing one constraint is not enough; both volume and weight must remain within limits.

Bag setup	Volume status	Weight status	Outcome
40L, 33L packed, 8kg limit, 6.4kg packed	+7L	+1.6kg	Pass
40L, 39L packed, 7kg limit, 7.8kg packed	+1L	-0.8kg	Fail (weight)
35L, 37L packed, 8kg limit, 7.2kg packed	-2L	+0.8kg	Fail (volume)
45L, 42L packed, 10kg limit, 10.4kg packed	+3L	-0.4kg	Fail (weight)

Use this tool when you need a fast decision during active planning or execution.
Use this before committing money, time, or tradeoffs that are hard to reverse.
Use this to compare options using the same assumptions across scenarios.

Results can be misleading if key inputs are missing, stale, or unrealistic.
Very small or very large values may amplify rounding effects and interpretation risk.
If assumptions change mid-decision, recalculate before acting.

💡 You must satisfy both constraints, not just one.

💡 Soft bags can pass volume but still fail weight checks.

💡 Reweigh after adding chargers and toiletries; they often break limits.

❓ Which limit usually fails first?

It depends on packing style; dense gear often hits weight first.

❓ Can this optimize item selection?

This version validates a plan; optimization can be added later.