A size finder for rings, shoes, bras and dogs
A ring isn’t sized like a coat. Ruban Size knows how each kind of product is measured: it asks for the right measurements, applies the right rules and answers in the sizes your shoppers know.
Pick a product: this is the size guide your shoppers use.
Ready to use, product by product
Each type is set in the chart’s Fit tab, or comes with its template. There is no formula to write and no step to build.
Rings
By finger circumference, or the inner diameter of a ring the shopper owns, with the paper strip method for those with no tape. US, UK, EU and JP sizes; the larger size for a wide band.
Shoes
By foot length, with half sizes written any way (7.5, 7½, 7 1/2), a toe margin when your chart lists inside lengths, and foot width said as narrow, regular or wide.
Bras
Band and cup charts, merged cells included. The size in EU, FR, IT, UK, US, AU and JP, the sister sizes, and a size from underbust and bust (EN 13402).
Belts
By waist, with a 5 cm margin on the belt length: two holes of play.
Bracelets and straps
Wrist plus 1.3, 1.9 or 2.5 cm of ease, for a snug, comfortable or loose fit.
Hats and helmets
By head circumference; between two sizes, the larger one.
Gloves
By hand circumference and hand length.
Kids
By age and height, with measurements kept apart from the parent’s.
Dogs
By breed from a searchable list, yours or the chart’s, or by neck, chest and back length.
Only loaded where it’s needed
The rules for these types live in a file of their own, loaded only by their charts. A T-shirt page never downloads the ring rules.
How it works
Pick the template
Rings, shoes, bras, belts, gloves, hats, helmets, kids or dog coats.
Adjust the values
Your brand’s sizes; the questions follow the product type.
Publish
Find my size asks for the right measurements on its own.
Fit by product type: questions
Do I need to set up formulas or steps?
No. Each product type is ready to use: pick it in the chart’s Fit tab, or start from its template.
Can shoppers find a ring size without a tape measure?
Yes. They can measure a ring they already own, or wrap a strip of paper around their finger; the guide explains both.
Does it give international sizes?
Yes. Rings answer in US, UK, EU and JP sizes, bras in seven systems with their sister sizes, shoes in the systems of your chart.
Try Ruban Size on your store.
Free for 5 size charts. Pro and Fit start with a 14-day free trial, billed by Shopify.