Sea vs Air Freight Calculator — True Cost Comparison
Use our sea vs air freight calculator to compare sea vs air freight from China including inventory carrying cost savings. Calculate whether the air freight premium is worth it.
Based on benchmark lane pricing, common port charges, and route assumptions rather than live carrier or forwarder quotes.
Freight moves quickly with seasonality, fuel, capacity, and route disruption. Treat these as planning benchmarks, not guaranteed quotes.
sea vs air freight calculator
Medium SERP difficulty
The decision between air and sea freight isn't just about rate per kg — it's a business decision about cash flow, risk, and the true cost of transit time. This calculator helps you compare both modes with all costs included.
The Complete Cost Comparison Model
| Cost Factor | Air Freight | Sea Freight (LCL) |
|---|---|---|
| Freight rate | $5–$15/kg | $0.50–$2/kg equivalent |
| Transit time | 5–10 days | 25–40 days |
| Fixed fees per shipment | $100–$200 | $400–$600 |
| Capital carrying cost | Low (fast transit) | High (slow transit) |
| Stockout risk | Minimal | Higher |
| Damage rate | Low (direct handling) | Slightly higher (LCL co-load) |
| Suitable volume | 1–500 kg | 100 kg+ |
Carrying Cost Impact by Shipment Value
Carrying cost model: Inventory value × 22% annual rate × transit days ÷ 365
| Shipment Value | Sea (30 days carry) | Air (7 days carry) | Carry Cost Saving (Air) |
|---|---|---|---|
| $5,000 | $90 | $21 | $69 |
| $15,000 | $271 | $63 | $208 |
| $30,000 | $542 | $126 | $416 |
| $50,000 | $904 | $211 | $693 |
| $100,000 | $1,808 | $421 | $1,387 |
The carrying cost saving from air freight rarely justifies the full premium. The real value of air freight is stockout avoidance and seasonal timing — these are often worth multiples of the freight premium.
Decision Matrix
| Situation | Recommendation |
|---|---|
| Product value < $5/kg | Sea freight — air costs more than product |
| Product value > $100/kg | Air freight — freight is negligible vs value |
| Seasonal deadline in < 30 days | Air freight |
| Replenishment, no stockout risk | Sea freight |
| First order, need to validate quickly | Air freight for test batch |
| Dense product (> 400 kg/m³) | Sea freight — dim weight doesn't apply |
| Bulky, light product (< 100 kg/m³) | Sea freight — dim weight makes air expensive |
| Emergency restock | Air freight |
Worked Example: 300 kg Electronics
Route: Shenzhen → Los Angeles
Product value: $15,000
| Air Freight | Sea Freight (LCL) | |
|---|---|---|
| Freight rate | $7/kg | $70/CBM |
| Volume/weight | 300 kg actual, 250 kg dim | 1.5 CBM, 300 kg actual |
| Freight cost | $2,100 | $105 (1.5 × $70) |
| Fixed fees | $200 | $550 |
| Transit (days) | 7 | 30 |
| Carry cost difference | — | $271 more |
| Total cost | $2,300 | $926 |
| Savings vs air | — | $1,374 cheaper |
Sea freight saves $1,374. Unless a stockout costs more than $1,374 in lost margin during those extra 23 days, sea freight wins.
Tips for China Importers
- Get 3 freight forwarder quotes for every shipment. Rates for the same lane can vary 20–35% between forwarders. Never book with the first quote you receive.
- Know your LCL vs FCL crossover point. For most lanes, FCL 20ft becomes cheaper than LCL around 15 CBM. At 20+ CBM, FCL almost always wins on cost and transit time.
- Book 4–6 weeks ahead during peak season (July–October). Spot rates spike 30–50% during peak season. Pre-booking or securing a contract rate with your forwarder saves significantly.
- Negotiate free days at the destination port. Standard is 5 free days before demurrage kicks in. Push for 7 days — most forwarders will accommodate regular shippers.
- Always insure your cargo. Marine cargo insurance costs 0.3–0.5% of CIF value. One damaged container without insurance can wipe out months of profit. Never skip it.