Thinking about localization ROI without a spreadsheet full of guesses

Return on investment is a hard thing to calculate honestly for localization, because one side of the equation is knowable and the other genuinely isn't. This article isn't a formula — there are no real numbers a general article can responsibly give you — it's a way of reasoning about the decision that stays honest about which parts you can actually know in advance and which parts you're guessing at.

The cost side is the knowable side

Translation cost scales with word count, and word count is something you can measure precisely before spending anything. Engineering cost — the work to make your text exportable and your UI resilient to longer strings — is more variable but still scopeable once you look at your own codebase. This means the cost side of a localization decision is, in principle, a number you can pin down with real confidence before committing.

That's worth treating as an asset. When one side of a decision is genuinely knowable, spend the effort to know it precisely, because it gives you a real ceiling to compare uncertain upside against.

The upside side is not knowable in advance

How many additional players a new language will bring, and how much revenue those players represent, cannot be known with any precision before you localize — there is no reliable way to forecast demand for a market you haven't tested. Comparable games in the same genre supporting a language is a weak signal at best, not a number you can extrapolate from.

Treating the upside as unknowable rather than as a number you can estimate confidently is not pessimism — it's accuracy. The honest move is to design a decision process that doesn't require knowing that number in advance.

Run cheap demand tests before the expensive commitment

Because the cost of full localization is real and the upside is unknown, it makes sense to look for lower-cost signals of actual interest before committing to the expensive version. A localized store page is far cheaper than a localized game and tests something close to the real question: will people in this language, looking at this exact game, act on it (wishlist, follow, buy)?

Community signals work the same way — requests in reviews or forums for a specific language, or organic engagement from a region despite the language barrier, are evidence that costs you nothing to notice. None of these signals is proof, but each one shifts your confidence in a direction you can act on, which a spreadsheet full of assumed conversion rates cannot honestly do.

Marginal cost drops if you built for it

The reasoning above changes shape once you've already localized into one additional language. If your text was structured well from the start — externalized strings, stable keys, no hardcoded concatenation — and your QA checks (placeholder integrity, length, formatting) are automated rather than manual, the second and third languages cost meaningfully less per word to add than the first did, because the engineering and process cost was paid once.

This means the ROI question isn't static per language — it should account for the fact that early structural investment lowers the bar for every language after the first, which can justify committing to a second or third language even when each one's individual demand signal looks marginal on its own.

Maintenance is part of the investment, not an add-on

Any ROI reasoning that only accounts for the cost of the initial translation is incomplete. Every update, patch, and piece of new content you ship afterwards carries the same translation obligation for as long as you support that language, and that ongoing cost belongs in the same mental ledger as the upside you're weighing it against — not treated as a separate, later problem.