YouTube Audience Localization Calculator

1. In YouTube Studio, open Analytics and choose Advanced Mode. Break the report down by geography, or by audio or subtitle language, for one date range.
2. Copy the views for each market. Add watch time in hours as a third value if you want view duration per market.
3. Paste one row per market. Add your video counts and localization cost to see coverage and cost per 1,000 views outside your top market.

What each result tells you:

YouTube audience localization is the work of making videos usable for viewers in other languages and regions. YouTube Help documents four tools for it: translated titles and descriptions, subtitles and captions, multi-language audio tracks, and localized thumbnails.

Localization starts with a measurement. A channel needs to know how concentrated its audience is before it picks a language. This calculator measures that concentration from your own views by country or language. It reports facts about your audience and does not grade them.

YouTube Help describes who benefits from multi-language audio: you are a good candidate if you already have viewership from multiple geographies or frequent comments in different languages. The share of views outside your top market is the first of those two signals.

The calculator turns views into shares, then sums the squared shares to measure concentration.

1. Share of views = market views / total views, for every row.
2. HHI = the sum of the squared percentage shares. The US Department of Justice describes this index as a commonly accepted measure of concentration.
3. Effective number of markets = 10,000 / HHI. One market with every view gives 1.00, and four equal markets give 4.00.
4. Average view duration = watch time in hours x 60 / views, in minutes, for rows with watch time.
5. Localized share = localized videos / public videos. Cost per 1,000 = cost / views outside the top market x 1,000.

The HHI runs from near zero, for many equal markets, to 10,000 for a single market.

Example values only, not benchmarks. The markets are labelled A to E. The channel has 240 public videos, 36 of them localized, and spent 450 on localization in the period.

Views outside the top market are 310,000 / 850,000 = 36.5%. The top three markets hold 88.2%. The HHI is 4,419, so the audience spreads like 2.26 equal-sized markets.

Market B has the longest average view duration at 5.50 minutes, against 4.17 across all rows. Localized videos are 36 / 240 = 15.0%. Cost outside the top market is 450 / 310,000 x 1,000 = 1.45 per 1,000 views.

Meaning: one market dominates, but viewers in Market B watch longer per view, which makes that market a reasonable first test for a translation.

Four documented YouTube features affect which markets find and watch a video.

Translated Titles and Descriptions

YouTube Help states that translated titles and descriptions let viewers find your videos in their own language, and that search looks at them to return results in the language viewers speak.

Subtitles and Captions

YouTube Help says subtitles and captions share a video with a larger audience, including viewers who speak another language.

Multi-Language Audio

Audio tracks default to the viewer's preferred language, which is determined by watch history. YouTube Help reports that creators who uploaded such tracks saw over 25% of their watch time come from views in the video's non-primary language. That is YouTube's own figure for those creators, not a forecast for your channel.

Limited Data in Analytics

Rows with little traffic are hidden in the geography report, so small markets are missing from your rows. The measured spread is then slightly narrower than the real one.

The three methods change different parts of the viewing experience, and YouTube Help documents each one separately.

YouTube Help notes that multi-language audio is available to creators with access to Advanced features, and that it does not create dubs for you. To set the cost of any method against the views it adds, use the translation ROI calculator.

Choosing a First Language

Rank markets by views and by view duration. A market with a meaningful share and a long view duration already responds to your videos.

Tracking Progress After Localizing

Run the same date range length before and after. A rising share outside the top market and a higher effective number of markets show a wider audience.

Linking Reach to Income

Views are not revenue. The viewer geography revenue calculator shows what each country earns, and the watch time hours calculator turns views and duration into hours.

1. Relying on a Score

YouTube publishes no localization score. A share and a concentration index describe your audience without invented weights.

2. Choosing a Language by Country Size

A large country is not a large audience for your topic. Start from your own rows.

3. Spreading Across Many Languages

YouTube Help advises depth: focus on one or two languages and dub as much content as you can for them.

4. Ignoring the Back Catalog

YouTube Help suggests that dubbing half or more of an existing catalog gives new viewers more to discover.

5. Translating Audio but Not Metadata

A dubbed video with an untranslated title is hard to find. The video SEO checklist covers title and description limits.

6. Mixing Country and Language Rows

Use one breakdown per run. Country rows and language rows overlap, so mixed rows double count.

The arithmetic is exact for the rows you enter, and the result describes concentration, not quality.

Open Analytics in YouTube Studio and select the Audience tab for top geographies, or use Advanced Mode with the geography breakdown for views per country.

The Audience tab has a top subtitle and CC languages report. YouTube Help also says you can track views and watch time broken down by audio language.

It is 10,000 divided by the HHI. In the example, an HHI of 4,419 gives 2.26, so five rows behave like about two equal markets.

No official level exists. The figure describes your position, and the useful comparison is your own channel over time.

Multi-language audio does not. YouTube Help states that it lets you upload your own dubbed tracks and is separate from the automatic dubbing feature.

YouTube Help says the feature is currently available to creators with access to Advanced features. You add tracks from the Languages page in YouTube Studio on a computer.

Yes. YouTube Help states that once videos are translated, viewers can find them when they search using a translated title and description.

YouTube Help reports over 25% of watch time from non-primary language views for creators who uploaded such tracks. Your result depends on your own audience.

Either works, one type per run. Country rows show where viewers are. Language rows show what they listen to or read.

No. The maths runs in your browser and nothing is sent to us. Save keeps a result only in this browser.

• Add Multi-language features to your videos (YouTube Help, read 2026-10-03; multi-language audio, localized thumbnails, eligibility, best practices and the 25% watch time statement).
• Translate your own video titles and descriptions (YouTube Help, read 2026-10-03; translated titles and descriptions).
• Add subtitles and captions (YouTube Help, read 2026-10-03; subtitles and captions).
• Understand your YouTube audience (YouTube Help, read 2026-10-03; Audience tab reports: top geographies and top subtitle and CC languages).
• Herfindahl-Hirschman Index (US Department of Justice, read 2026-10-03; definition, the 30-30-20-20 example and the 10,000 maximum).