Project Zomboid Steam Revenue & Sales Estimates

Based on our analysis using the Boxleiter method, we estimate Project Zomboid's total gross revenue on Steam at approximately $120,509,335.

This estimate comes with a confidence range:

• Conservative estimate (x20): $70,887,844
• Calibrated midpoint (x34): $120,509,335
• Optimistic estimate (x60): $212,663,532

The actual revenue may vary due to regional pricing, seasonal discounts, and refund rates.

With 377,063 Steam reviews and a 94% positive rating, we estimate Project Zomboid has sold between 7,541,260 and 22,623,780 copies, with a best estimate of 12,820,142.

This is based on the Boxleiter method, which uses the observation that roughly 1 in every 20 to 60 buyers leaves a Steam review. For the midpoint we do not assume a universal 30x value; we use a calibrated multiplier of x34 that adjusts for the title's age, price tier, genre, and review profile.

After Steam's tiered platform fee of effectively 22.5%, The Indie Stone keeps an estimated $93,407,468 from Project Zomboid's gross revenue of $120,509,335.

Here's the breakdown:

• Gross Revenue: $120,509,335
• Steam's Fee (22.5%): -$27,101,867
• Developer Revenue: $93,407,468

Note: This doesn't account for publisher shares, taxes, or development costs.

Steam uses a tiered revenue sharing model that reduces the platform's cut as a game earns more:

• First $10 million: 30% to Steam, 70% to developer
• $10M to $50M: 25% to Steam, 75% to developer
• Above $50M: 20% to Steam, 80% to developer

For Project Zomboid, with an estimated gross revenue of $120,509,335, this results in an effective rate of 22.5%. Steam keeps approximately $27,101,867 and The Indie Stone receives $93,407,468.

These estimates use the Boxleiter method, a widely-used industry approach that estimates game sales from the number of Steam reviews.

Factors that affect accuracy:

• Review-to-purchase ratio varies by genre
• Discount history - games with frequent deep sales may have higher ratios
• Regional pricing - different prices in different markets are not captured
• Refunds - Steam's return policy means some counted sales were refunded
• Bundled sales - keys sold through third-party bundles may not generate reviews

We provide a confidence range ($70,887,844 to $212,663,532) to reflect this uncertainty. For the best estimate we combine the Boxleiter range with a calibrated midpoint (x34) and a calibrated ASP of $9.

If Project Zomboid generated the same gross revenue on the Epic Games Store, The Indie Stone would keep approximately $106,168,215 - that's $12,760,747 more than on Steam.

At this revenue level, Epic's concrete platform fee would be $14,341,120. Epic charges 0% on the first $1 million in annual per-app revenue and then 12% on the remaining amount. On GOG (30% cut), the developer would earn approximately $84,356,534.

Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.

According to SteamSpy data, players spend an average of 67.9 hours in Project Zomboid, with a median playtime of 13.4 hours. The large gap between average and median suggests a dedicated core community playing well beyond the typical player.