Convert between blueprint (scale drawing) measurements and real-world sizes. Pick a scale and enter a length to scale it up or down.
Converted Length
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Result in the unit you chose.Usage Tip
If a plan has a printed scale bar, measure it to confirm the print was not resized. A drawing labeled 1/4″ = 1 ft that prints at the wrong size throws off every measurement.
THE MATH
Drawing to real: real = drawing × scale ratio
Real to drawing: drawing = real ÷ scale ratio
1/4″ = 1 ft is the same as 1:48
Real to drawing: drawing = real ÷ scale ratio
1/4″ = 1 ft is the same as 1:48
A scale ratio of 1:48 means 1 unit on paper equals 48 units in real life. Architectural scales convert to ratios: 1/4″ = 1 ft is 1:48, 1/8″ = 1 ft is 1:96.
Keep the drawing and real measurements in the same unit, then convert to feet or meters at the end.
Keep the drawing and real measurements in the same unit, then convert to feet or meters at the end.
Pick a preset scale or type any ratio in the scale box for an odd or metric scale.
Measure to the same unit you set, then read the result in that unit; the chip shows a handy feet or meter conversion.
Printed plans may be reduced or enlarged from their stated scale — check a known dimension or the scale bar before trusting measurements off the page.
Measure to the same unit you set, then read the result in that unit; the chip shows a handy feet or meter conversion.
Printed plans may be reduced or enlarged from their stated scale — check a known dimension or the scale bar before trusting measurements off the page.