Where does the weight come from?

From Shopify. OrderRules reads the weight already set on each product variant in your Shopify product editor, so there is nothing extra to maintain. A variant with no weight set counts as zero — check your catalog before you rely on a weight cap.

Can I mix units — a rule in lb with products in grams?

Yes. OrderRules converts units automatically, so a 40 lb rule compares correctly against a product stored in grams. Pick whichever unit reads naturally for your store; pounds, kilograms, ounces, and grams are all supported.

What is the Rolling 30 days period?

It counts the customer's weight over the last 30 days from the moment of checkout, rather than resetting on a fixed calendar date. A customer who bought 40 lb on the 3rd gets that allowance back gradually rather than all at once on the 1st — useful for fair-share allocation and flat-rate shipping budgets.

Does this stop a customer from splitting the weight across several orders?

Yes. Weight limits are per customer over a period, not per checkout, so OrderRules adds up the weight across every order the customer places in that window and blocks the checkout that would push them past the cap. Turn on strict login enforcement so every order is tied to a customer account.

Which plan includes weight-based limits?

Pro. Weight limits are part of the per-customer limit set on the Pro plan, and they are also included on Advanced.

Weight-Based Customer Limits

3 min read

Limit Customers by Total Weight

A weight limit caps how many pounds (or kilograms, ounces, or grams) a single customer can buy over a period. It's the right rule when the constraint is physical rather than numerical — a flat-rate box that tops out at 40 lb, a fair-share allocation of a limited harvest, or a regulated product measured by weight rather than by unit.

Weight limits are a per-customer rule: they count across every order a customer places in the period, not just the current cart.

How to Set Up

Confirm your product variants have a weight set in Shopify
Go to Customer Limits
Click Add Customer Limit
Choose Total weight as the limit type
Enter the maximum and pick the unit — lb, kg, oz, or g
Choose the scope — storewide, a product, or a collection
Choose the period — Rolling 30 days, daily, weekly, monthly, or lifetime
Click Save

Rule:    Max 5 kg per customer, rolling 30 days
Scope:   Collection "Single Origin"

Order 1 (Mar 3):  3 x 1 kg bags     -- OK (3 kg / 5 kg used)
Order 2 (Mar 9):  3 x 1 kg bags     -- Blocked (would reach 6 kg)
Order 2 (revised): 2 x 1 kg bags    -- OK (5 kg / 5 kg used)
Apr 3: the March 3 order ages out -- 3 kg becomes available again

Example: Flat-Rate Shipping Budget

Rule:    Max 40 lb per customer per month
Scope:   Storewide

Order 1: 25 lb  -- OK (25 lb / 40 lb used)
Order 2: 20 lb  -- Blocked (would reach 45 lb)
Order 2 (revised): 15 lb -- OK (40 lb / 40 lb used)
Resets on the 1st, in your store's timezone.

Scopes

Scope	What it counts	Good for
Storewide	Total weight across everything the customer buys	Shipping and packaging budgets
Per product	Weight of one product across the customer's orders	A single heavy or allocated item
Per collection	Weight across every product in a collection	Fair-share drops, regulated categories

Units and Conversion

Rules accept lb, kg, oz, and g. OrderRules converts automatically, so the unit on your rule and the unit on each product don't have to match — a 40 lb cap compares correctly against a 450 g product. Set the rule in whatever unit your team thinks in.

Periods

Rolling 30 days counts backwards from the moment of checkout, so a customer's allowance frees up gradually instead of all at once. Daily, weekly, monthly, and lifetime work exactly as they do for other customer limits, resetting in your store's timezone — see Limit Periods.

What Customers See

On product pages (logged in):

"You can add 15 lb more this month"

At checkout:

"This order would exceed your 40 lb monthly limit (already ordered: 25 lb)."

Every one of these messages is customizable, and shoppers see them in their own language — see Languages & Translations.

Tips

Audit your catalog for variants with no weight set — they count as zero
Turn on strict login enforcement so weight is tracked per customer, not per guest checkout
Combine a weight cap with a quantity cap when you need both a "how much" and a "how many" rule — whichever is reached first blocks checkout

Limit Periods Set Up the Delivery Date Picker