Feet to mm and mm to feet converter

Redrawing a US drawing set in a metric template means converting feet-and-inch dimension strings, not decimal feet. Enter both parts for the exact millimetre value plus the rounded 5 mm figure most European and MENA offices dimension to — and use the reference tables below for the reverse direction, mm back to feet and inches.

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L'outil et les libellés sont en français. Les notes de référence ci-dessous restent en anglais.

feet to mm converter

Feet (ft)Inches (in)

Millimetres: 3,200.4mm
Rounded to 5 mm: 3,200mm
Metres: 3.2004m
Decimal feet: 10.5ft

Formula

mm = (feet × 304.8) + (inches × 25.4)

One foot is exactly 304.8 mm because an inch is exactly 25.4 mm. Convert the feet and inches separately, then add — never convert a mixed string as a decimal.

Worked examples

Input	Result
8'-0" ceiling	2438.4 mm (2440 rounded)
3'-6" corridor	1066.8 mm (1065 rounded)
1'-0" module	304.8 mm

Feet to mm — common values

Exact conversions at 304.8 mm per foot, with the rounded figure most metric offices dimension to.

Feet	Millimetres
0.5 ft	152.4 mm (150 rounded)
1 ft	304.8 mm (305 rounded)
1.5 ft	457.2 mm (455 rounded)
2 ft	609.6 mm (610 rounded)
2.5 ft	762 mm (760 rounded)
3 ft	914.4 mm (915 rounded)
3.5 ft	1,066.8 mm (1,065 rounded)
4 ft	1,219.2 mm (1,220 rounded)
4.5 ft	1,371.6 mm (1,370 rounded)
5 ft	1,524 mm (1,525 rounded)
5.5 ft	1,676.4 mm (1,675 rounded)
6 ft	1,828.8 mm (1,830 rounded)
7 ft	2,133.6 mm (2,135 rounded)
7.5 ft	2,286 mm (2,285 rounded)
8 ft	2,438.4 mm (2,440 rounded)
8.5 ft	2,590.8 mm (2,590 rounded)
9 ft	2,743.2 mm (2,745 rounded)
9.5 ft	2,895.6 mm (2,895 rounded)
10 ft	3,048 mm (3,050 rounded)
10.5 ft	3,200.4 mm (3,200 rounded)
11 ft	3,352.8 mm (3,355 rounded)
12 ft	3,657.6 mm (3,660 rounded)
15 ft	4,572 mm (4,570 rounded)
16 ft	4,876.8 mm (4,875 rounded)
20 ft	6,096 mm (6,095 rounded)
24 ft	7,315.2 mm (7,315 rounded)
25 ft	7,620 mm (7,620 rounded)
30 ft	9,144 mm (9,145 rounded)
50 ft	15,240 mm (15,240 rounded)
100 ft	30,480 mm (30,480 rounded)

mm to feet and inches — common values

The reverse direction, for reading metric models on imperial sheets.

Millimetres	Feet and inches
10 mm	0' 0.39" (0.0328 ft)
50 mm	0' 1.97" (0.164 ft)
100 mm	0' 3.94" (0.3281 ft)
150 mm	0' 5.91" (0.4921 ft)
200 mm	0' 7.87" (0.6562 ft)
250 mm	0' 9.84" (0.8202 ft)
300 mm	0' 11.81" (0.9843 ft)
500 mm	1' 7.69" (1.6404 ft)
600 mm	1' 11.62" (1.9685 ft)
900 mm	2' 11.43" (2.9528 ft)
1,000 mm	3' 3.37" (3.2808 ft)
1,200 mm	3' 11.24" (3.937 ft)
1,500 mm	4' 11.06" (4.9213 ft)
1,800 mm	5' 10.87" (5.9055 ft)
2,000 mm	6' 6.74" (6.5617 ft)
2,100 mm	6' 10.68" (6.8898 ft)
2,400 mm	7' 10.49" (7.874 ft)
2,500 mm	8' 2.43" (8.2021 ft)
3,000 mm	9' 10.11" (9.8425 ft)
3,600 mm	11' 9.73" (11.811 ft)
5,000 mm	16' 4.85" (16.4042 ft)
6,000 mm	19' 8.22" (19.685 ft)
10,000 mm	32' 9.7" (32.8084 ft)

Questions

Why do converted dimensions look untidy in metric?

Imperial construction modules do not land on metric ones. 8'-0" is 2438.4 mm, which most offices dimension as 2440. Agree the rounding rule with the design team before redrawing, and record it in the BIM execution plan.

Is 1 foot 300 mm?

No — that is a 1.6% shortcut that accumulates fast. A 100 ft façade converted at 300 mm/ft is 480 mm short, which will not close against a coordinated grid.

How do I convert mm to feet?

Divide by 304.8. A 2400 mm dimension is 7.874 ft, which reads 7'-10 1/2" on an imperial sheet. The reverse table on this page lists the millimetre values that come up most on drawing sets.

How do I change units from mm to feet in AutoCAD?

Type UNITS, set Length type to Architectural and Insertion scale to Inches, then update the dimension style: set DIMLFAC to 0.03937 (1/25.4) so existing millimetre geometry reads in feet and inches. Do not SCALE the model — that breaks every coordinated reference.

How do I change mm to feet in Revit?

Manage → Project Units → Length, then choose "Feet and fractional inches" and set rounding to the nearest 1/16". Revit stores geometry in a single internal unit, so switching display units changes nothing in the model — only how dimensions read.

How do I convert square mm to square feet?

Divide by 92,903.04 (304.8²). Area conversions square the linear factor, which is why applying 304.8 to an area figure is out by a factor of 304.8 — use the m² to ft² converter for floor areas.

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