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Les I don't think you are as comfortable with metric as i am but if you want to do easy grade calcs, get a metric measureing device and do all your length and height measurements in metric, as follows and it is the easiest thing to work out % gradeint.Do all horizontal measurements in meters and all vertical measurements in centimetres and divide the height by the lenth and you will automatically have % gradient eg 4 metres with a crise of 20 cm = 20 / 4 = 5 % Do not do your measuremnts in imperial and convert them, as the conversion will just muddy things up.Rgds Ian
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