Free Freight Cost Estimator
Compare ocean and air freight on the same shipment. This free freight rate calculator applies chargeable-weight math to your forwarder rates, then shows what the air premium actually buys you.
The calculator opens with an illustrative Shanghai to Los Angeles LCL shipment. Replace every rate with the matching line from your own forwarder quotes.
Lowest estimated freight cost
$440
sea freight
Sea total
$440
Air total
$2,485
LCL billable
2.5 W/M
Air billable
500 kg
Compare Sea vs Air Freight Costs
Shipment details and rates from your quotes
Sea vs Air Comparison
Your comparable quote analysis
| Line item | Sea (LCL) | Air |
|---|---|---|
| Chargeable basis | 2.5 R/T | 500 kg |
| Variable freight | $155 | $2,400 |
| Fixed charges entered | $285 | $85 |
| Total estimated cost | $440 | $2,485 |
| Transit time | 15 days | 7 days |
| Cost per actual kg | $0.88 | $4.97 |
Air Premium
$2,045
For about 8 days saved.
Carrying Cost Released
$175.34
Capital freed by arriving earlier, at 20% carrying cost.
Break-Even Cargo Value
$466,515.62
Cargo value where the air premium starts to pay for itself on carrying cost alone.
Recommendation
Sea is the better economic choice: the air premium of $2,045 costs more than the $175 of carrying cost the 8 saved days release. Pay for air only when the delivery date protects revenue.
- This calculation uses the rates and fixed charges you entered. Confirm what each quote includes before comparing totals, especially pickup, terminal handling, fuel, security, customs, delivery, insurance, duty, and tax.
Go beyond one-off estimates
Stop re-running this comparison in a spreadsheet
SupplyAutomate keeps every purchase order, shipment, supplier document, and freight invoice in one workspace, so the mode decision you make here shows up in the real landed cost per unit instead of getting lost.
How This Sea vs Air Freight Calculator Works
The freight cost estimator combines your quote rates, shipment density, fixed charges, and the speed premium between sea and air.
1. Chargeable weight vs volume
Sea freight bills the greater of volume and weight/measure at 1 CBM per 1,000 kg. Air freight bills the greater of gross weight and volumetric weight at 167 kg per CBM.
2. Lane rates and fixed charges
Enter the variable rates and fixed charges from your forwarder quotes. This avoids pretending that a static website rate is a live, bookable price.
3. The cost of waiting
The cheaper mode is not always the better one. Enter a cargo value and the calculator prices the carrying cost that faster transit releases.
Sea vs Air Freight: What Actually Changes
Cost is only one of the four things that move when you switch mode. The comparison above prices all of them.
How the cargo is billed
Sea freight bills revenue tons at 1 CBM per 1,000 kg, subject to the minimum in your quote. The example starts at one W/M. Air freight bills volumetric weight at 167 kg per CBM whenever it beats gross weight. Bulky, light cargo is punished hardest by air. The air rule matches the IATA 1:6000 guidance.
Where the fixed costs sit
LCL carries origin CFS and destination handling charges that do not shrink with the shipment, which is why a small LCL booking can lose to air on a per-kg basis.
Why quote scope matters
Compare like with like. If one quote is port-to-port and the other is door-to-door, add the missing pickup, terminal, customs, and delivery charges before deciding. Use the import duty calculator to model duties and taxes separately. For contract scope, check the official ICC Incoterms rules.
What the waiting costs
Weeks at sea tie up capital. Feed the result into the landed cost calculator so freight stays inside your unit economics rather than arriving as a surprise invoice.
Market reference checked August 11, 2026
Flexport confirms why static lane prices are misleading
Flexport's public Shanghai to Los Angeles examples currently start at $1,149 for a 5 CBM, 750 kg LCL shipment and $6,226 for a separate 6 CBM, 1,000 kg air shipment. Those examples use different cargo dimensions, so they are useful benchmarks, not a valid head-to-head quote. Open the current Flexport rates page and enter comparable quote totals above.
Why Accurate Freight Estimates Matter
Choose the right shipping mode
A sea vs air freight comparison keeps you from paying for speed when the business case is not there.
Protect gross margin
Freight swings can materially change unit economics. Estimating freight cost early keeps margin assumptions grounded.
Set better delivery expectations
Transit-time benchmarks let ops, purchasing, and finance work from the same timeline before booking cargo or requesting a freight quote.
Margin planning
Keep freight inside the landed-cost model
Booking discipline
Compare quotes with a baseline first
Sea vs Air Freight Calculator FAQ
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The calculator is free. The follow-through is the hard part.
You picked a mode. Now track what it actually cost.
The estimate above is a decision. SupplyAutomate is where the decision lives afterwards: purchase orders, supplier documents, shipment milestones, freight invoices, and the real landed cost per unit, updating as the order moves, not three months later.
SupplyAutomate
Example ocean shipment
Shipment SA-2214 · Shanghai to Los Angeles
$0.94
Actual freight cost per unit
$440
Ocean freight billed
$318
Duty on entry
$10.42
Landed cost per unit
Every estimate on this page becomes a tracked number once the order is real.