How many copies did Hammerfight sell?

131k to 212k copies, based on its 2k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Hammerfight make?

Hammerfight is free to play, so there is no copy-sales revenue to estimate.

How big is Hammerfight?

Estimated owners: ≈ 131k–212k; from 2k reviews (Mostly Positive)

A labeled estimate from the public review count (adjusted for release year), not exact sales. Owner data cross-checked with SteamSpy.

Does this actually work?

We left Hammerfight out and predicted the genre from its 8 similar games. Every figure here, including Hammerfight's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 5.4M–12.6M

best case 104.7M (Garry's Mod)

Games like Hammerfight

The middle of these games

≈ 5.4M–12.6M copies

≈ $38.7M–$83.2M after Steam's cut

from ~173k reviews

Only the top fifth of 2019’s Steam releases earned about $34k gross, so plan for that or less.

All 8 of your similar games are hits.

Best case: Garry's Mod at ≈ 79.8M–129.6M copies, ≈ $219.1M–$589.2M after Steam's cut. A breakout hit, far above a typical game.

The genre you'd be entering

Your set: Your set clusters on Sandbox (5 of 8) and Physics (4 of 8).
The winners: Winners here lead with Sandbox + Moddable, priced around $10. The breakout hits carry Casual + First-Person + Moddable; a typical game here doesn't.
The era: The games you compared span 2006 to 2021, and none of them shipped in the last two years.

How these numbers were worked out

A hit here: 1,000+ reviews, roughly $150k+ before Steam's cut (a standard indie benchmark).

Copies come from each game's reviews times a sales-per-review rate that falls with release age, from about 31 for the most recent game here to about 79 for the oldest, then widened into a range; revenue rides on that estimate times price. Source: GameDiscoverCo (2020) and VG Insights (2021).

Similar games

Game	Est. copies	Est. revenue	Price	Reviews	Tags
Stick Fight: The Game 2017	Est. copies ≈ 4.3M–7.0M SteamSpy 2M–5M	Est. revenue $5.9M–$15.9M after Steam's cut $10.8M–$24.5M before the cut	$4.99	125k reviews Very Positive	MultiplayerFunny
Garry's Mod 2006	Est. copies ≈ 79.8M–129.6M 7.3x vs typical SteamSpy 20M–50M	Est. revenue $219.1M–$589.2M after Steam's cut $398.4M–$906.5M before the cut	$9.99	1.3M reviews Overwhelmingly Positive	SandboxModdable
Fall Guys 2020	Est. copies ≈ 11.6M–18.9M 2.7x vs typical SteamSpy 20M–50M	Est. revenue Free	Free	469k reviews Very Positive	MultiplayerParty Game
People Playground 2019	Est. copies ≈ 9.1M–14.9M 1.8x vs typical SteamSpy 5M–10M	Est. revenue $25.1M–$67.5M after Steam's cut $45.7M–$103.9M before the cut	$9.99	317k reviews Overwhelmingly Positive	SandboxGore
Human Fall Flat 2016	Est. copies ≈ 9.4M–15.3M SteamSpy 10M–20M	Est. revenue $51.8M–$139.3M after Steam's cut $94.2M–$214.2M before the cut	$19.99	226k reviews Very Positive	Co-opFunny
Space Engineers 2019	Est. copies ≈ 3.9M–6.3M SteamSpy 2M–5M	Est. revenue $21.3M–$57.2M after Steam's cut $38.7M–$88.0M before the cut	$19.99	134k reviews Very Positive	SpaceSandbox
Totally Accurate Battle Simulator 2021	Est. copies ≈ 3.8M–6.2M SteamSpy 2M–5M	Est. revenue $20.9M–$56.2M after Steam's cut $38.0M–$86.5M before the cut	$19.99	153k reviews Overwhelmingly Positive	SandboxSimulation
Assetto Corsa 2014	Est. copies ≈ 9.7M–15.8M SteamSpy 5M–10M	Est. revenue $53.4M–$143.6M after Steam's cut $97.1M–$220.9M before the cut	$19.99	173k reviews Very Positive	RacingAutomobile Sim