Model railroad calculators
Most first layouts fail on geometry, not on budget. The curve is too sharp for the locomotive, the grade is too steep for the train, the bus is too thin for the far end of the railroad. Every calculator here answers the version of the question that depends on your scale, your room and your equipment, and shows the arithmetic it used.
Researched from manufacturer specifications, instruction manuals and published NMRA standards, never from hands-on testing. Where a figure is hobby convention rather than a standard, we say so.
198 reference pages, each computed rather than written, so the figures match the calculator that produced them exactly. Find the page for your own equipment, your own rise and run, or your own bus length.
The throttle is the system: everything lives in the handheld. Widely regarded as the easiest DCC system to learn, and the same cab becomes a walkaround throttle if you later add a bigger NCE command station.
Best for: the simplest DCC system to actually understand
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Twenty five lengths, which is 75 feet of track and enough for most home layouts in one purchase at the lowest price per foot.
Best for: laying a whole HO layout in code 83
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Kato mechanisms and Unitrack are the reason N scale works reliably for beginners: the track locks together with a positive electrical joint rather than relying on rail joiners.
Best for: somebody who wants N scale to actually run well from the first evening
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A conventional freight set on the current LionChief 5.0 electronics, which adds Bluetooth control and app speed control to the standard remote.
Best for: a first O gauge freight set for an adult buyer
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DCC and control
Motive power
Rolling stock
Every pick is matched to a real scale, a real minimum radius or a real current draw using manufacturer specification sheets, instruction manuals, published NMRA standards and recommended practices, and the recurring themes in verified owner reviews. We do not test products in person and we never claim to. Picks are split into beginner, intermediate and expert tiers so the recommendation fits the layout rather than the price bracket.
They are planning tools built on published standards and plain geometry, and every page shows the formula it used so you can check the working. Scale conversion, grade, frog angle and voltage drop are exact arithmetic. Car weight follows NMRA RP-20.1. Where a figure is a hobby rule of thumb rather than a standard, such as minimum radius as a multiple of car length, the page says so plainly and points you at the manufacturer stated minimum instead.
Scale is the proportion of the model to the real thing, such as 1:87.1 for HO. Gauge is the distance between the rails, which for HO is 16.5 millimetres. They are independent: narrow gauge modelling uses full scale models on narrower track, and large scale uses several different proportions on the same 45 millimetre track, which is why two G scale models can be visibly different sizes and both be correct.
Measure the room first, then decide. The largest curve radius that fits is half the width less a margin, and that number tells you what equipment will run, which tells you the scale. N takes about a quarter of the area of HO for the same railroad. O is roughly three and a quarter times HO and is far more durable with children. The most common regret is committing to a scale before measuring.
Yes. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. It never changes which product we recommend, and it is why several pages here tell you not to buy something: the expert tier that most people do not need, sound on every locomotive, or a turntable on a plan with nowhere to put it.
Researched, not professional advice. Everything here is compiled from published manufacturer specifications, instruction manuals, published NMRA standards and recommended practices, and owner-review consensus, not hands-on testing. Figures described as a rule of thumb are hobby convention rather than a standard, and they are labelled that way wherever they appear. Check any radius, clearance or grade against your own equipment before cutting wood or laying rail. Any permanent mains wiring in a layout room is work for a licensed electrician to your local code.