Start from a template
In FitKit, click Create guide. You can start from a blank table or from one of the 6 preloaded templates:
- Men's t-shirts — sizes with chest and length measurements
- Women's t-shirts — sizes with bust and length measurements
- Pants — waist, hips and inseam
- Shoes — EU / US / UK conversion with foot length
- Rings — ring sizes with circumference
- Kids — age-based sizing with height
Templates come pre-filled with typical values — treat them as a starting point and replace the numbers with your own measurements. Your products are rarely “average”, and accurate numbers are what actually reduces returns.
Plan note: the Free plan includes 1 guide and the basic templates (tops and pants). All 6 templates and unlimited guides are part of the Growth plan.
Edit the table
The table is fully free-form: add, remove and reorder rows and columns as you like. A typical layout uses one row per size and one column per measurement, but nothing forces that — build the chart your products need.
Column types
Each column has a type, and the type controls how the modal treats its values:
| Type | What it's for | cm/inches conversion |
|---|---|---|
| Size | Size labels: S / M / L, 38 / 40 / 42, US 8, age 4–6… | Never converted — labels stay as typed |
| Measurement | Body or garment measurements: chest, waist, inseam, foot length… | Converted automatically between cm and inches |
| Text | Anything else: fit notes (“runs small”), fabric, style advice… | Never converted — shown as-is |
Values and ranges
Measurement cells accept a single value (96) or a range (96–101). Ranges are usually what you want for body measurements — a size M rarely fits exactly one chest circumference.
Ranges power the size recommender. On the Pro plan, the rule-based recommender matches the 2–3 measurements a visitor enters against the ranges in your table to suggest their size. No ranges, no recommendation — so if you plan to use the recommender, fill measurement columns with ranges.
cm / inches
Enter your measurements once, in the unit you work in. In the storefront modal, visitors get a cm / in switch and FitKit converts measurement columns on the fly. The default unit follows the visitor's locale — a US visitor sees inches first, a French visitor sees centimeters. Nothing to configure.
Add “how to measure” blocks
Below the table, you can add How to measure blocks: a short text instruction paired with one of the line-art illustrations FitKit provides (chest, waist, hips, inseam, foot length, and more). They show in the modal under the chart and remove the second-biggest source of sizing doubt: shoppers not knowing where to put the tape measure.
Upload a guide image
Already have a designed size chart as an image? Upload it (500 KB max) and it's displayed in the modal. You can combine it with a table, or use it alone. Keep the file small — it's your shoppers' bandwidth.
Translations Growth
FitKit's built-in interface strings — the “Size guide” link, the unit switch, the modal chrome — are automatically localized in English, French, German and Spanish based on the visitor's locale.
On the Growth plan you can also translate your own content — column headers, how-to-measure texts, fit notes — into FR / DE / ES. Each visitor then gets the guide fully in their language, and measurements default to their local unit.
Save and publish
- Click Save. The guide is stored and ready to use.
- Assign it so it appears on the right products — see assign guides to products.
- Open an assigned product on your storefront and click the Size guide link to check the result. Edits go live as soon as you save.
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