Hammer Units

Hammer Units are the Dimensions used by the Hammer Editor for Source Engine. Most games use different scales but the most common are 1:12 & 1:16 for Player Models & Geometry/Props respectively.

Scales

Map Scales

1 Foot to 12 Hammer Units

Usually for Human Characters and other miscellaneous models.

Grid	Imperial	Metric	Notes
~0.3937	~0.39″	1 cm	1 Centimeter †
1	1″	2.54 cm	1 Inch
2	2″	~5 cm
4	4″	~10.1 cm
8	8″	~20 cm
12	1′	~30.4 cm	1 Foot
16	1′ 4″	~40.6 cm
24	2′	~61 cm
28	2′ 4″	~71 cm
32	2′ 8″	~81 cm
36	3′	~91 cm
~39.37008	~3′ 3″	1 m	1 Meter
45	3′ 9″	~1.14 m
48	4′	~1.21 m
62	5′ 2″	~1.57 m
64	5′ 4″	~1.63 m
72	6′	~1.83 m
96	8′	~2.44 m
108	9′	~2.74 m
128	9′ 8″	~3.25 m
160	13′ 4″	~4.06 m
192	16′	~4.88 m
256	21′ 4″	~6.5 m
512	42′ 8″	~13 m
† Too small to be used in-editor (Except with Microgrid in Hammer++)

1 Foot to 16 Hammer Units

Usually for Map Geometry & Props.

Grid	Imperial	Metric	Notes
~0.5249	~0.3937″	1 cm	1 Centimeter †
1	0.75″	1.905 cm
~1.3333	1″	2.54 cm	1 Inch
2	1.5″	3.81 cm
4	3″	7.62 cm
8	6″	15.24 cm
12	9″	22.86 cm
16	1′	30.48 cm	1 Foot
20	1′ 3″	38.1 cm
24	1′ 6″	45.72 cm
28	1′ 9″	53.34 cm
32	2′	60.96 cm
36	2′ 3″	68.58 cm
40	2′ 6″	76.2 cm
44	2′ 9″	83.82 cm
45	2′ 9.75″	85.725 cm
48	3′	91.44 cm
~52.4934	~39.37′	1 m
56	3′ 6″	~1.07 m
64	4′	~1.22 m
72	4′ 6″	~1.37 m
80	5′	~1.52 m
96	6′	~1.83 m
108	6′ 9″	~2.06 m
128	8′	~2.44 m
160	10′	~3.05 m
192	12′	~3.66 m
256	16′	~4.88 m
512	32′	~9.75 m
† Too small to be used in-editor (Except with Microgrid in Hammer++)

Skybox Scales

1 Foot to 1 Hammer Unit (1⁄16 scale of Regular Map)

Usually used for Skybox Creation (excluding Left 4 Dead & Left 4 Dead 2).

Unit	Skybox Grid	Imperial	Metric	Other/Notes
16 Map-Grid Hammer Units	1	1′	30.48 cm	Ratio of Regular Hammer Units to Skybox Hammer Units in a 1:16 Ratio
100 yards	300	300 ft	~91.4 m	Imperial Based
100 meters	~328 1⁄12	~328 1⁄12 ft	100 m	Metric Based
1 kilometer	~3,283 4⁄12	~3,283 4⁄12 ft	1 km	Metric Based
1 mile	5,280	5,280 ft	~1.6 km	Imperial Based - 1,670 yd
1 acre	43,560² (66 × 660)	43,560 ft² (66 ft × 660 ft)	~4,047 m² (~20 m × ~201 m)	Imperial Based - 1⁄640 mi², ~0.405 ha, 4840 yd²
1 hectare	~107,639² (~328 × ~328)	~107,639 ft² (~328 ft × ~328 ft)	10,000 m² (100 m × 100 m)	Metric Based - ~11,960 yd²

2 Feet to 1 Hammer Unit (1⁄32 scale of Regular Map)

Usually used for Skybox Creation, specifically for Left 4 Dead & Left 4 Dead 2 skyboxs that use a 1⁄32 scale instead of 1⁄16

Unit	Skybox Grid	Imperial	Metric	Other/Notes
32 Map-Grid Hammer Units	1	2′	60.96 cm	Ratio of Regular Hammer Units to Skybox Hammer Units in a 1:16 Ratio
100 yards	150	300 ft	~91.4 m	Imperial Based
100 meters	~164	~328 1⁄12 ft	100 m	Metric Based
1 kilometer	~1,640	~3,283 4⁄12 ft	1 km	Metric Based
1 mile	2,640	5,280 ft	~1.6 km	Imperial Based
1 acre	10,890² (33 × 330)	43,560 ft² (66 ft × 660 ft)	~4,047 m² (~20 m × ~201 m)	Imperial Based - Done by halving the lengths, not area.
1 hectare	~26,910² (~164 × ~164)	~107,639 ft² (~328 ft × ~328 ft)	10,000 m² (100 m × 100 m)	Metric Based - Done by halving the lengths, not area.

See Also

• Dimensions
• Measurements
• Unit