What does scale 1:48 mean?
Scale 1:48 is a ratio where the first number is the size on the model or drawing and the second number is the size in the real world. One unit on the model stands for 48 of the same units at full size, so one inch on the model equals 48 inches — four feet — in reality.
In US drawing terms, 1:48 is the quarter-inch scale: a quarter inch on paper represents one foot in the real world, because 12 inches divided by 48 is 0.25 inch. That lets you read plans straight off the quarter-inch edge of an architect's scale ruler, which is why the ratio is common on floor plans and site drawings.
The scale factor is 1/48, or about 0.0208. To convert by hand, divide the real length by 48 to get the model length, or multiply the model length by 48 to get the real size. The math works in any unit as long as both sides use the same one.
Where is scale 1:48 used?
Scale 1:48 keeps a lot of detail while staying compact, so it shows up across several hobbies and trades:
- O scale trains — in the United States, O gauge is built to 1:48, where a quarter inch equals a foot.
- Aircraft models — one of the most common kit sizes, big enough to show cockpit and panel detail without taking over the shelf.
- Military and armor kits — used for tanks, vehicles and figures alongside the larger 1:35 standard.
- Architectural drawings — the quarter-inch scale used for house plans, floor layouts and site plans.
- Dollhouses — known as quarter scale, one quarter the size of the standard 1:12 dollhouse.
Examples of scale 1:48 in practice
A few real numbers make the scale easier to picture:
- Car — a 16 ft car comes out at 4 in on the model.
- Room — a 12 ft wide room scales to 3 in on the drawing.
- Person — a 6 ft tall figure stands 1.5 in high.
- Aircraft — a 48 ft wingspan works out to exactly 12 in, or 1 foot, across.
- House — a 40 ft wide house becomes 10 in on the plan.