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Medicinal plants extracts are a rich natural source of bioactive phytochemicals (mainly polyphenols). This study aims at determining the total polyphenols content (TPC) of nine medicinal plants extracted using the UV-visible (UV-Vis) spectroscopic method, along with the Orange Data Mining Tool (ODMT). The TPC for the selected medicinal plant extracts (i.e., <i>Daucus carota</i> L. root, <i>Ruta Chalepensis</i> L. Leaves, <i>Anisosciadium</i> DC. Leaves, <i>Thymus vulgaris</i> L. Leaves, <i>Senna alexandrina</i> leaves, <i>Myrtus communis</i> L. leaves, <i>Silybum Marianum</i> L. Flower, <i>Silybum marianum</i> L. Leaves, and <i>Rosa moschata</i> Flower) was measured using gallic acid (GA) as a standard. The intended method requires a maximum of 1 mg of GA and only 1 mg of the plant extract. The wavelength range of the maximum absorption in the UV-vis spectrum was about 270 nm. For polyphenols, the purposed method linear dynamic concertation range (44.67 to 334.7 mg GA equivalent (GAE)/g dry weight (DW)) with a recovery percentage range of 95.3% to 104.3%, and the good regression value, was found to be R² = 0.999. This method was easy, fast, accurate, and less expensive than the conventional Folin–Ciocalteu method.