How overweight baggage calculator Works
The 50-pound cliff
Standard limits run 50 lb (23 kg) domestic, with fees jumping at 50 (100-ish), 70 (150-ish), and hard rejection past 90–100 lb (safety limits for handlers). The cliff means 49 lb is free and 51 lb is $100 — the steepest per-pound pricing in travel, and entirely avoidable with a $15 scale and a coat with pockets.
Redistribution beats payment
The counter negotiation you can prepare at home: dense, heavy items (shoes, books, chargers, toiletries-over-limit) migrate to carry-ons and coat pockets. Eight pounds moved turns a $100 fee into a shrug. Airlines price overweight high precisely because most people pay — the prepared redistribute instead.
The second-bag alternative
When carry-on room is gone, splitting into a second checked bag ($35–45) beats the overweight fee ($100+) up to the point where two full-price bags lose. The crossover: any bag over ~20 lb overweight should probably have been two bags. The math is simple; the scale at home makes it actionable.