Pixel to DP

    /**
     * The calculation (value * scale + 0.5f) is a widely used to convert from dps to pixel units
     * based on density scale
     * see developer.android.com (Supporting Multiple Screen Sizes)
     */
    public static int convertDpToPixels(int dp, DisplayMetrics displayMetrics) {
        return Math.round(dp * ((displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT)));
    }

Note: to get the display metrics do: getContext().getResources().getDisplayMetrics();