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The aim of this paper is mainly, after some theoretical explanations, toprovide a program on Maple for computing, whatever be d, the curvature of theplanar d-web implicitely defined by a differential equation F(x,y,y')=0, Fbeing polynomial of degree d with respect to y'.  Moreover, we prove in the appendix a "concentration theorem" for anycalibrated ordinary $d$-web of codimension one in n-dimensional manifold (inparticular for any planar web). Its curvature matrix, relatively to an"adapted" trivialization, is concentrated on the (n-2+k0)!/(n-2)!k0! last lines(the last line if n=2), k0 denoting the integer such thatd=(n-1+k0)!/(n-1)!(k0)!$.

Courbure des tissus planaires d\'efinis implicitement par une \'equation diff\'erentielle polynomiale en y'. Programmation