Floor Plan Scale Converter
Convert measurements between a scaled floor plan and the real world — metric ratios (1:50, 1:100) and imperial architectural scales (1/4" = 1'-0") — plus a quick unit converter for mm, cm, m, inches, and feet. Free, no signup.
Quick answer: at 1:100, 1 cm on the drawing is 1 m in the room; at 1:50, 1 cm is 50 cm; at 1/4" = 1'-0", 1 inch on paper is 4 feet; at 1/8" = 1'-0", it is 8 feet.
Quick unit converter
1 m = 3.2808 ft
How drawing scales work
A drawing scale is the ratio between a distance on the plan and the same distance in the real world. A 1:50 plan compresses reality 50×, so 10 mm on paper is 500 mm (0.5 m) in the room. Imperial architectural scales express the same idea per foot: 1/4" = 1'-0" means a quarter inch of drawing per real foot — a 1:48 ratio. Unit conversions use the exact definitions 1 in = 25.4 mm and 1 ft = 304.8 mm.
| Scale | Ratio | Typical use |
|---|---|---|
| 1:50 / 1/4" = 1'-0" | 1:50 / 1:48 | Room layouts with table and seat detail |
| 1:100 / 1/8" = 1'-0" | 1:100 / 1:96 | Full floor plans, event halls, ballrooms |
| 1:200 / 1/16" = 1'-0" | 1:200 / 1:192 | Whole buildings and site overviews |
Results are exact arithmetic conversions of the numbers you enter. Printed plans can shrink or stretch when copied or exported — verify against a printed scale bar or a known dimension before taking measurements off paper.
Frequently Asked Questions
What does a 1:100 floor plan scale mean?
A 1:100 scale means every unit measured on the drawing represents 100 of the same unit in the real world. So 25 mm measured on a 1:100 plan equals 2,500 mm — 2.5 meters — in the actual room.
How do imperial architectural scales like 1/4" = 1'-0" work?
The notation 1/4" = 1'-0" means a quarter inch on the drawing represents one foot (12 inches) of real distance. That is a ratio of 12 ÷ 0.25 = 48, so one inch measured on the plan equals 48 inches — 4 feet — in reality. Common variants: 1/8" = 1'-0" is 1:96, and 1/2" = 1'-0" is 1:24.
Which scale should I use for an event floor plan?
Venue and event floor plans are most often drawn at 1:50 or 1:100 (metric), or 1/8" = 1'-0" and 1/4" = 1'-0" (imperial). Larger scales like 1:50 show table and seat detail; smaller scales like 1:200 fit a whole hall on one sheet.
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