Dimension

Two or three measurements with their own units, and a formula that calculates the price by size.

A single option that collects several measurements: width, height, and optionally depth. Each measurement has its own label, unit, and limits. Dimension is the only option type with a Formula, which calculates the add-on price from the values the customer enters.

Use it for made-to-measure products such as blinds, canvases, worktops, glass, framed prints, and cut fabric.

Dimensions are not supported in the Shopify POS app, and the app displays a notice when you add it. For in-person orders, use multiple Number fields to collect measurements instead. See POS limitations.

Watch it done — 1:55. Width and height fields with their own units and limits, and a formula that prices each order from the numbers the customer types.

What customers see

Two or three numeric fields on one row, each with its own label and unit.

All the measurements sit in one option, so the row reads as a single question.

Basic

Setting	What it does
Label / Name	Customer-facing text, and the name on the order.
Required field	Blocks add to cart until every axis has a value.
Hidden label	Hides the label.
Option values	The axis rows themselves. See below.
Help text	Guidance that stays visible — the right place for your minimum and maximum sizes.
Add-on price	The base amount the formula works from.
Formula	How the measurements turn into a charge. See below.
Conditional logic	Show or hide based on other choices.

The axis rows

A Dimension option starts with three rows, tagged X position, Y position, and Z-Axis. They correspond to Width, Height, and Depth. Each row has its own settings:

Column	What it is
Label	What the customer reads above that field — Width, Drop, Diameter.
Placeholder	Example text inside the empty field.
Unit	The unit shown with the field — cm, m, inch.
Default value	A starting figure.
Min / Max	The smallest and largest you can produce on that axis.

Delete the third row if your product needs only two measurements. Set Min and Max on every row you keep, so customers cannot order a size you cannot produce.

Each axis can use a different unit. For example, Width can use centimeters while Quantity of panels uses a plain count.

Each axis is a row with its own label, unit, and limits.

Add-on price and Formula

Instead of a flat charge, the price is calculated from the measurements the customer enters.

Field	What it holds
Add-on price	A number the formula can refer to as {{addon}} — typically your rate per unit of area or length.
Formula	An expression using x, y, z for the three axes and {{addon}} for the price above.

The placeholder in the field shows the expected format: x * y * {{addon}}.

Formula	Means	Example
x * y * {{addon}}	Price by area	60 × 90 at a rate of 0.01 → $54.00
x * {{addon}}	Price by width alone	200 at a rate of 0.5 → $100.00
(x + y) * 2 * {{addon}}	Price by perimeter, for framing	60 and 90 at 0.2 → $120.00
x * y * z * {{addon}}	Price by volume	For boxes and packing

A formula cannot contain subtraction. A - is rejected with the message "Formula cannot contain subtraction." Use multiplication, addition, and division instead.

Set your rate in Add-on price and keep the formula simple. Then test it by entering the smallest and largest sizes you allow, and check that both prices are correct.

Full detail and more worked examples: Dimension add-on formula.

Advanced

Setting	What it does
Help text position	Where the help text sits.
HTML class / Column width	Styling hook and field width.

Dimension has no prefix or suffix settings, because each axis has its own Unit.

Personalizer

Not supported.

Examples

A made-to-measure blind priced by area

Setting	Value
Label / Name	Blind size
X position	Label Width, unit cm, min 30, max 240
Y position	Label Drop, unit cm, min 30, max 250
Z-Axis	Deleted
Add-on price	0.012
Formula	x * y * {{addon}}
Required field	On
Help text	Measure the recess, not the window. Widths from 30 to 240 cm.

A canvas print priced by area

Width and height in centimeters, Min 20 and Max 150 on each, formula x * y * {{addon}}.

A frame priced by perimeter

Width and height in centimeters, formula (x + y) * 2 * {{addon}}, because the cost of a frame follows the length of the molding.

Cut-to-length fabric

Delete two of the three rows. Label the remaining axis Length, set the unit to m, and use the formula x * {{addon}}.

Notes

• Available on the Advanced plan.

• Not supported on Shopify POS.

• No Personalizer support.

• Up to three axes. For more measurements, add a second Dimension option or use Number fields.

• The formula cannot contain subtraction.

• Each measurement is stored in the order as its own value with the axis label, for example Width: 120.

• Set Min and Max on every axis. Without them, a customer can order a size you cannot produce, and the formula still calculates a price for it.