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Percentage rates scale shipping with the value of the order. They suit high-value or insured goods, where cost tracks price rather than weight or size.

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Setting one up

1

Add a rate to your zone

Inside your rule, click Add rate on the shipping zone you want.
2

Choose the calculation parameter

Set Calculation parameter to Percentage of total price.
3

Enter the percentage

Enter the number only — 10 means 10%, not 0.1.
4

Decide on rounding

Tick Round up to nearest integer if you want whole-currency prices. With it on, a calculated $2.67 becomes $3.
Percentage rates do not ask for a Rate Type — there are no ranges or increments to configure. The price is simply the percentage applied to the cart.

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What the percentage applies to

The percentage is taken from the total price of the items the rule matched, not necessarily the whole cart. This matters when a rule targets a subset of products. If a rule matches only items tagged fragile, a 10% rate charges 10% of the fragile items’ value — not 10% of the entire order.
This is what makes percentage rates work well with product conditions: you can charge 10% on artwork and a flat fee on everything else, in two separate rules, and each rate only sees its own products.

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Capping the result

A pure percentage has no ceiling, which on a large order can produce an unreasonable shipping charge. Use Setting Maximum and Minimum Shipping Rates to bound it.
A percentage rate with no maximum is one of the more common causes of complaints about shipping cost at checkout. If you use percentage rates, set a cap.

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Examples

10% of order value, capped
Then set a maximum on the rule so it never exceeds your ceiling. Percentage on artwork only, flat rate on the rest

Maximum and minimum

Put a floor and ceiling on any calculated rate.

Ranged Rates

Price bands instead of a smooth percentage.

Cart Conditions

Choose whether to measure before or after discounts.

Rate blending

Combine a percentage rate with others.