How long a dog ramp do I need for an SUV? This page does the geometry most angle tables skip: given the height to climb and a candidate ramp length, it gives the angle, the floor run the ramp actually needs, and whether that run fits the space you have. It runs entirely in your browser and saves or sends nothing.
Angle = arcsin(height ÷ ramp length). Floor run needed = √(ramp length² − height²). Longest ramp that fits your available run = √(height² + available run²), and its angle = arcsin(height ÷ that length). A ramp must be longer than the height, or the angle is undefined — the page will warn you.
With the defaults above: height 24 in, candidate ramp 60 in. Angle = arcsin(24 ÷ 60) = 23.58°. Floor run needed = √(60² − 24²) = 54.99 in, which fits the 60 in available run. The longest ramp that fits that run is √(24² + 60²) = 64.62 in, at an angle of 21.80°.
Angles around 18–25° are commonly cited as a comfortable general guide for many dogs, but that is a general guide only, not veterinary advice. An older, arthritic or very small dog may need a gentler angle, a different ramp, or a vet's advice, and every ramp has a weight limit you must check separately — this page does not check weight, grip, or your dog's condition. If the run does not fit, a longer ramp will not help: a longer ramp needs even more floor run, so the trade-off is angle versus space, and the longest-fitting calculation above shows it.
Do I measure height to the bumper or the floor? Measure to the surface the dog actually steps onto. What about a telescoping ramp? Enter its extended length as the candidate length and its folded length separately. Is this a buying recommendation? No. It only checks geometry and fit; you check the retailer's price, weight limit and return terms yourself. This page is not veterinary, safety or commercial advice.
This is a free, single-purpose calculator. All calculation happens in your browser. No account, no upload, no tracking by this page beyond any ads Google may serve after approval.