PackFitter
Packing Calculator & Fit Tool
Plan. Pack. Fly.
Most travelers guess. PackFitter calculates. Enter your trip, gear, bag, and airline to see whether your setup actually fits.
Built on real clothing volumes, not guesswork.
Your result depends on what you pack, not just the bag size.
Based on real clothing volumes and packing behavior
Most packing advice tells you to "roll your clothes" and hope for the best. PackFitter uses real clothing volumes, packing efficiency ratios, and airline-specific carry-on dimensions to give you an actual answer.
The calculator accounts for clothing size, packing style, compression potential, rigid items like laptops and shoes, and whether laundry access changes the equation. It's the difference between a guess and a plan.
This is a planning tool, not a guarantee. Airline staff make the final call — packed shape, bag rigidity, and gate-day enforcement all play a role.
Use it to answer real packing decisions before your trip.
What to pack for a 3-day trip →
What to pack for a 5-day trip →
Will a 40L backpack fit on Delta? →
Will a 40L backpack fit on United? →
Will a 40L backpack fit on American? →
Will a 40L backpack fit on Southwest? →
Not sure if it'll all fit? Try the packing calculator →
This tool reflects real-world packing conditions, not just theoretical bag sizes. Results are based on typical clothing volumes, packing efficiency, and common travel setups.
Airline size limits are published in inches and apply to the full external dimensions of the bag when packed. A bag that measures within range at home may not fit the same way at the gate if it's overfull or poorly organized.
This is a planning tool, not a guarantee. Airline staff make the final call — packed shape, bag rigidity, and gate-day enforcement all play a role.
Last updated: April 2026. PackFitter is an independent tool. It is not affiliated with any airline or bag brand. Airline policies may change — always verify with your airline before travel.