Enter the component's constraints
Enter the component name, its character limit, and how much overflow (truncation tolerance) is acceptable before it becomes a real layout problem.
COPY-FIT SCORE
Copy Fit
Enter your component's character limit, source copy length, an expansion factor for translation, and truncation tolerance to see if the copy fits.
- Uses your inputs in a transparent calculation
- Instant result with practical next steps
- No signup required
Planning guidance only. Validate important decisions with customer evidence and your delivery team.
YOUR INPUTS
Build your result
Complete every field. The result updates only when you choose Calculate.
How it works
Enter your copy length and expansion factor
Enter your source (usually English) copy length and an expansion factor for the language you are translating into — German and Finnish often run 30-40% longer than English.
Get a copy-fit result
The calculator computes real arithmetic on whether the source and translated copy fit, by how many characters they overflow if not, and a fit score out of 100.
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Frequently asked questions
Does Copy Fit measure my actual rendered text or component?
No. Copy Fit performs character-count arithmetic on the numbers you enter — it does not measure rendered pixel width, font metrics, or an actual component, and does not run any AI/LLM step. Character count is a reasonable proxy for most UI components, but final visual QA in the real font and size is still recommended.
Where do I find a realistic expansion factor for my target language?
German, French, and Finnish typically run 20-35% longer than English; Chinese and Japanese are often shorter by character count but need more visual space per character. Use published localization expansion-factor tables or measure a few real translated strings from your own content for the most accurate number.
What is "truncation tolerance" for?
Some components can gracefully handle a small overflow with an ellipsis or a slight text-wrap without breaking the layout. Truncation tolerance lets you set how many extra characters are acceptable before overflow becomes an actual visual bug.
My translated copy overflows — what should I do?
Either shorten the source copy so the translation has more headroom, redesign the component with a wider or flexible container, or explicitly allow truncation/wrapping and design for it rather than treating it as an edge case.
Is this only useful for translated products?
No — it also catches components where even the source English copy is already too long for the space, which is a common issue independent of localization.
How We Compare
| Feature | MVPHub | Lokalise | Figma |
|---|---|---|---|
| Instant character-count fit calculation | Included | Limited | Not included |
| Configurable expansion factor per language | Included | Included | Not included |
| Full translation management workflow | Not included | Included | Not included |
| Visual pixel-width preview in real components | Not included | Not included | Included |
Lokalise manages the full translation workflow across languages and strings, and Figma can preview how real translated text looks in the actual component. Copy Fit is a fast arithmetic check you can run before either — flagging an overflow risk before strings are even sent for translation.
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