Linear Inches Calculator
Length + Width + Height
Measure the longest side as length, then width and height (depth). Include wheels, handles, and external pockets when airlines ask for total size. Results update as you type.
Result
Common luggage linear-inch totals
| Dimensions (L × W × H) | Linear inches | Typical use |
|---|
How to Use This Linear Inches Calculator
Airline size rules rarely quote a single length—they add length, width, and height into one number called linear inches (or linear dimensions). A suitcase labeled 30×18×14 in is not “30 linear inches”; it is 30 + 18 + 14 = 62 linear inches, which matches the familiar checked-bag ceiling on many US carriers. Measuring only the long side before a gate check is how good luggage still fails the tape test.
Think of linear inches as perimeter-style sizing for a box: you are not multiplying length × width × height (that would be volume). You are summing the three edge lengths so airlines can cap overall bulk whether the bag is tall and thin or short and wide.
- Measure length, width, and height with a tape measure. Use the longest horizontal edge as length unless your airline defines otherwise.
- Include wheels, handles, and pockets if the carrier’s policy counts external protrusions (most checked-bag rules do).
- Choose inches or centimeters in the unit dropdown. The calculator always reports linear inches for airline comparisons and shows the centimeter total too.
- Read the Result panel for the sum, step-by-step addition, and a plain-language note versus common 45–50 in carry-on and 62 in checked guidelines.
- Use the sample table for quick anchors, or click Load 62 in example to mirror a typical 30×18×14 in checked bag.
All math runs locally in your browser. Bag dimensions stay on your device unless you copy them yourself.
Linear Inches Formula and Examples
The definition matches shipping and airline documentation: one scalar size built from three orthogonal measurements.
Linear inches (same unit)
linear inches = L + W + H
Example: 30 in + 18 in + 14 in = 62 linear inches—a common checked-bag target. Another valid 62 in combo is 28 + 20 + 14; many combinations share the same linear total with different shapes.
When you measure in centimeters
linear inches = (Lcm + Wcm + Hcm) ÷ 2.54
Add centimeters first, then divide by 2.54 to express the sum in inches for US airline tables. The calculator performs that conversion automatically when cm is selected.
Linear inches vs volume
Linear inches do not equal cubic inches. Volume is L × W × H; carriers use linear sums because they limit how large an item can be along any axis combination, not how much space is inside.
Airline Luggage Limits (Typical Guidelines)
Limits change by airline, fare class, route, and loyalty status. Always confirm on your carrier’s site after booking—these anchors explain what the numbers in their footnotes mean.
- Carry-on: often about 45–50 linear inches total (sometimes quoted as max L, W, H each instead—still measure all three and sum).
- Checked baggage: commonly up to 62 linear inches on many US airlines before oversize fees.
- Personal item: smaller totals (often roughly 36–45 linear inches) under the seat in front of you.
- Special items: sports gear, instruments, and pets may use different rules or linear-inch caps.
For weight limits after sizing, use the Pounds to Kilograms Converter on scale readings. For print and screen dimensions (pixels, DPI), use the Pixels to Inches Converter. Broader unit mixes belong in the Conversion Calculator.
Frequently Asked Questions
What is a 62 linear inch suitcase?
Any bag whose length plus width plus height equals 62 inches. A 30×18×14 in suitcase is one example; other shape combinations can sum to 62 as well.
How do I calculate linear inches?
Measure length, width, and height in inches (including wheels and handles if required), then add the three numbers. In centimeters, add the three sides and divide the total by 2.54 to get linear inches.
What are linear inches used for?
Airlines and shippers use linear inches to cap overall package size without caring about exact shape. It is the standard way to check carry-on and checked luggage against size policies.
Do wheels and handles count toward linear inches?
For most airline checked and carry-on rules, yes—measure the bag as it will sit at the gate, including protruding wheels and handles, unless your carrier explicitly says otherwise.
Is my luggage data sent to a server?
No. Calculations run entirely in your browser on RapidRatio.