I am trying to work out how much my kitchen floor slopes before putting in a flat pack kitchen. The spirit level says it is a 2 degrees slope so how much does it drop over a metre? Appreciate any answers.

closed as off-topic by isherwood, ThreePhaseEel, mmathis, Daniel Griscom, JPhi1618 Oct 24 '17 at 19:07

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  • 2
    That's a massive tilt. I seriously doubt it's that much. You need a full-length level of high quality (or a rigid straightedge with a shorter level), and you need to reverse it to check for error. – isherwood Oct 14 '17 at 14:32
  • Tan(theta) x 100 will give you slope as a percent, or cm/m. So a 2 degree slope is 3 cm/m, which is quite a bit. Typical allowable deflections in building codes are 1/180 (approx 1/3 of a degree) or 1/360, depending on the application. – Chris Cudmore Oct 17 '17 at 13:07

tan(theta) = rise/run

tan(2 degree) = 0.035

That would be a 3.5cm drop over a 100cm run.

  • Thanks for that, sounds about right according to the kitchen bloke who visited – Jduffy Oct 14 '17 at 6:46

You can use trigonometry if you have access to a reference. For small angles (less than about 10 degrees), there is a handy approximation that is very close and easy to remember. If you have the measurements (rise or drop and the distance), the angle in degrees is approximately rise/run * 400/7.

In your case, you have the angle and the run, so you can transpose to find the rise (or drop in your case): for 2 degrees and a run of 1 meter, rise = 2 * 7/400 * 1 meter = .035 meters or 3.5 cm.

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