Hammer unit

“

We only got two speeds: fast and faster! Click to listen — The Engineer measuring projectiles' HU/s

”

Hammer unit, often abbreviated as HU, is the unit of length measurement used by Valve's Source Engine games.

The scale used for Source game is based on the Imperial Foot, so Metric measurements do not translate easily.

Ratios to Foot

• Maps, architecture and prop models: 1 foot = 16 HU. This means 1 unit is approximately equal to 1.905 centimeters.
  • This ratio is used to judge the speed of projectiles and players.

List of projectiles
Projectile	Weapon		Speed (Hu/s)	Arcs	Sticks	Reflectable	Can be destroyed by
Jar		Mad Milk	1019.9	Yes	No	Yes	Short Circuit
Jar		Mutated Milk
Cleaver		Flying Guillotine	3000	Yes	No	Yes	Short Circuit
Baseball		Sandman	3000	Yes	No	Yes	Short Circuit
Bauble		Wrap Assassin
Rocket		Rocket Launcher Black Box Rocket Jumper Original Beggar's Bazooka	1100	No	No	Yes	Short Circuit
		Direct Hit	1980
		Liberty Launcher	1540
Large energy beam		Cow Mangler 5000	1100				Short Circuit
Rocket		Air Strike					Short Circuit
Small energy beam		Righteous Bison	1200	No	No	No
Fireball		Dragon's Fury	3000	No	No	Yes	Short Circuit
Flare		Flare Gun Scorch Shot	2000	Yes	No	Yes	Short Circuit
Flare		Detonator
Flare		Manmelter	3000
Gas Can		Gas Passer	2009.2	Yes	No	Yes	Short Circuit
Grenade		Grenade Launcher	1216.6	Yes	No	Yes	Short Circuit
		Loch-n-Load	1513.3
Cannonball		Loose Cannon	1453.9
Grenade		Iron Bomber	1216.6
Stickybomb		Stickybomb Launcher	925.38 2409.2	Yes	To world	Yes	In air: Short Circuit On surface: Bullets Melee weapons Syringes Scottish Resistance Quickiebomb Launcher Short Circuit Detonator Scorch Shot
Stickybomb		Scottish Resistance
Stickybomb		Sticky Jumper
Stickybomb		Quickiebomb Launcher	930.88 2409.2
Rocket		Sentry Gun (Level 3)	1100	No	No	Yes	Short Circuit
Small energy beam		Pomson 6000	1200	No	No	No
Repair claw		Rescue Ranger	2400	Yes	Yes	Yes	Short Circuit
Syringe		Syringe Gun Blutsauger Overdose	1000	Yes	To world	No
		Crusader's Crossbow	2400	Yes	Yes	Yes	Short Circuit
Arrow		Huntsman Fortified Compound	1800 2600	Yes	Yes	Yes	Short Circuit
Jar		Jarate	1017.9	Yes	No	Yes	Short Circuit
Jar		Self-Aware Beauty Mark
Grappling Hook		Grappling Hook	1500	No	Yes	No
Magic Spells		Magic Spells	422.17 1019.8	Sometimes	No	No
Rocket		MONOCULUS	330 1100	No	No	Yes	Short Circuit

• Skyboxes (which are 1/16th scale of ordinary maps) use 1 foot = 1 HU.
• Human Character models and certain other models for Source Engine currently use 1 foot = 12 HU.

Related achievements

 Soldier

Project Excelsior Parachute 19.47 miles.

 Demoman

Operation High Dive Parachute 19.47 miles.

Related Contracts

A number of Mercenary Park Contracts, such as "Long range arrow kill" for the Sniper and "Long range heal with the Crusader's Crossbow" for the Medic are reliant upon Hammer Units for calculation.