Real dimension and scale ratio in — model size out, for 1:24 diecasts, 1:50 plans and 1:87 train layouts.
Scale modeling speaks in ratios: 1:24 cars, 1:50 site plans, 1:87 HO trains, 1:12 dollhouses. Enter the real-world dimension and the ratio — <strong>the model size is the real dimension ÷ the ratio</strong> — and the calculator does the division in the units you measured in.
Yes — every calculator on this site is free, runs entirely in your browser, and requires no signup.
The formulas are the standard ones used in the trade, accurate to fractions of an inch or pound; add a small waste margin to every order.
Slabs and pads: cubic yards and bag counts in seconds.
Open →Cubic yards and tonnage for driveways, paths and bases.
Open →Cubic yards and 2-cu-ft bag counts for any bed size.
Open →Cubic yards and tons for bedding, play sand and fill.
Open →Cubic yards and tons for lawns, beds and leveling.
Open →Total bag count for any fence run, split per hole.
Open →Missing a feature or found something off? Tell us — user suggestions decide what we build next.