Shopping
Effective cost per kilogram
Falls as weight rises, because the flat base fee is spread over more kilograms.
The Formula
cost per kg = total cost / weight
Falls as weight rises, because the flat base fee is spread over more kilograms.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| c | Cost per kilogram | currency per kg | Effective rate after the base fee is included. |
| C | Total cost | currency | Full shipping charge. |
| w | Weight | kilograms | Chargeable weight of the parcel. |
What Each Symbol Means
ccurrency per kg
Cost per kilogram
Effective rate after the base fee is included.
Ccurrency
Total cost
Full shipping charge.
wkilograms
Weight
Chargeable weight of the parcel.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate shipping cost page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Shipping Cost, filed under Everyday Life. Every number the guide produces comes from substituting into this one line.