Airlines size baggage by total dimensions – length plus width plus height – including wheels and handles. Most U.S. airlines allow carry-ons up to about 22 × 14 × 9 in (45 linear inches) and checked bags up to 62 linear inches; oversize bags incur fees. Always check your airline’s rules.
How to use the Linear Inches Calculator
- Length (height of bag)
- Width
- Depth
Results update as you type, and every field accepts the units shown in its menu.
How it works
Measure the bag including wheels and handles and enter the three dimensions.
Tips
- Use the figures printed on your product or its manual when you have them.
- Round quantities up so you are never short.
- Measure twice before you buy anything cut to size.
- Everything runs in your browser – try different values to compare options.
Common mistakes to avoid
- Mixing units (inches and centimetres, mAh and Ah).
- Ignoring efficiency losses and safety margins.
- Treating rules of thumb as exact.
Inputs explained
| Field | What to enter |
|---|---|
| Length (height of bag) | Units: in, cm |
| Width | Units: in, cm |
| Depth | Units: in, cm |
What each result means
- Linear dimensions = [Length (height of bag)] + [Width] + [Depth]
- Volume = [Length (height of bag)]×[Width]×[Depth]
Example values
How the main result changes when Length changes and everything else stays at the example values above:
| Length (height of bag) (in) | Linear dimensions (in) |
|---|---|
| 11 | 34 |
| 16.5 | 39.5 |
| 22 | 45 |
| 27.5 | 50.5 |
| 33 | 56 |
| 44 | 67 |
Formula
Linear inches = length + width + heightTypical limits: carry-on 45 in (115 cm), checked 62 in (158 cm)Worked example
Inputs — Length (height of bag): 22 in; Width: 14 in; Depth: 9 in.
Results — Linear dimensions = 45 in; Fits as = Carry-on (≤ 45 in); Volume = 45 L.
Frequently asked questions
What are linear inches?
Length + width + height of a bag.
What is the maximum checked bag size?
62 linear inches (158 cm) on most airlines.
Do wheels and handles count?
Yes – measure from the floor to the top of the handle and include wheels.
What formula does the Linear Inches Calculator use?
Linear inches = length + width + height.