Airline Baggage Fee, Weight & Penalty Calculator
Check baggage fee rules across 10 major airlines, calculate 51+ lb overweight penalties, and verify 62" linear dimensions before heading to the airport.
1. Airline & Route Rules
2. Luggage Weight & Quantities
Scale Reading3. Dimensions ($L + W + H \le 62"$)
Compliant Size$35.00
$35.00
1 Checked Bag$0.00
Under 50 lb Limit$0.00
≤ 62 Linear Inches$70.00
2x One-Way10-Airline Baggage Fee Comparison
Standard Economy (1st + 2nd Checked Bag)Click "Run AI Weight & Fee Audit" to evaluate scale calibration margins, identify high-density items (shoes, liquids, chargers) to transfer into your carry-on, and avoid $100–$200 gate fees. 100% private to you—zero server access.
Zero Data Access: Luggage weights and ticket parameters execute 100% locally on your device. Zero Server Access
The 51-Pound Airport Trap: How a Single Shampoo Bottle Triggers a $150 Gate Penalty and How to Pack Around Airline Fee Algorithms
An investigation into airline ancillary fee revenue, scale calibration variances, and baggage optimization.
The Strict 50.0 lb (23.0 kg) Binary Threshold
US commercial airlines generated over $7.1 Billion in ancillary baggage fees in 2025. When your suitcase weighs 50.0 lbs, you pay the standard $35–$40 fee. At 50.8 lbs, airline software automatically switches the classification to Overweight Tier 1, triggering an instant +$100 to +$150 surcharge. Transferring 1 lb of heavy items (shoes, jackets, laptop chargers) into your carry-on saves over $100 in 30 seconds.
Major Airlines Baggage Policies & Overweight Fees Compared
| Airline | 1st Checked Bag | 2nd Checked Bag | 51–70 lbs Penalty | 71–100 lbs Penalty |
|---|---|---|---|---|
| Southwest Airlines | $0 (FREE) | $0 (FREE) | +$100 | +$125 |
| Delta Air Lines | $35.00 | $45.00 | +$100 | +$200 |
| United Airlines | $40.00 | $50.00 | +$100–$150 | +$200 |
| American Airlines | $40.00 | $45.00 | +$100 | +$200 |
| Spirit / Frontier (ULCC) | $45.00–$65.00 | $60.00–$75.00 | +$50–$100 (>40 lbs!) | +$100–$150 |
Frequently Asked Questions (Airline Baggage)
What is the standard weight limit for checked bags on US airlines?
For domestic economy tickets on major US airlines (Delta, United, American, Southwest), standard checked bags are limited to 50 lbs (23 kg). Bags weighing 51 to 70 lbs incur overweight penalty fees of $100 to $150 per bag each way, while bags from 71 to 100 lbs incur fees up to $200.
How are airline luggage linear dimensions calculated?
Linear dimensions are calculated by adding the Length + Width + Height (L + W + H) of the suitcase including wheels and handles. The standard maximum linear dimension for checked luggage is 62 linear inches (158 cm).
Which US airline still allows free checked bags?
Southwest Airlines is the only major US carrier that allows every passenger two free checked bags (up to 50 lbs and 62 linear inches each) with all standard fare classes.