Travel & Luggage calculator
What Carry-On Size Do I Need?
Calculate carry-on size compliance using bag external length, bag external width, and bag external depth.
Enter your measurements
Before choosing a product, measure bag external length, bag external width, and bag external depth. The what carry-on size do i need tool uses those values to calculate carry-on size compliance and makes the limiting measurement clear.
- Bag external length — Required
- Bag external width — Required
- Bag external depth — Required
- Airline max length — Required
- Airline max width — Required
- Airline max depth — Required
Carry-on size compliance
Enter the measurements above to calculate carry-on size compliance.
How the calculation works
V12 calculation: fitPass=(bagLength≤limitLength AND bagWidth≤limitWidth AND bagDepth≤limitDepth) OR (bagLength≤limitLength AND bagDepth≤limitWidth AND bagWidth≤limitDepth) OR (bagWidth≤limitLength AND bagLength≤limitWidth AND bagDepth≤limitDepth) OR (bagWidth≤limitLength AND bagDepth≤limitWidth AND bagLength≤limitDepth) OR (bagDepth≤limitLength AND bagLength≤limitWidth AND bagWidth≤limitDepth) OR (bagDepth≤limitLength AND bagWidth≤limitWidth AND bagLength≤limitDepth). This is the implementation rule for this calculator.
Worked example
Example: Bag external length = 43.58 cm; Bag external width = 59.43 cm; Bag external depth = 68.59 cm; Airline max length = 67.77 cm; Airline max width = 89.89 cm; Airline max depth = 98.67 cm. Result: Fits.
Before you decide
Use measured dimensions rather than nominal labels. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what carry-on size do i need, the limiting result on this page is carry-on size compliance.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Carry-On Size calculator tell me?
It returns carry-on size compliance from the measurements entered on this page. The calculation is specific to carry-on size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for carry-on size?
Measure bag external length, bag external width, bag external depth, airline max length, airline max width, airline max depth. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the carry-on size compliance?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned carry-on size compliance while allowing for the clearances, tolerances or ratings shown by its manufacturer.