The present quantitative nutrition on U. lactuca and U. rigida was evaluated and compared. Data reveals that proximate analysis such as moisture, ash, dietary fiber, carbohydrate, protein, lipid, flavonoids, and phenol content was significantly higher in Ulva rigida. Analysis of variance showed significant differences in the proximate compositions of the rice varieties studied. Ulva rigida have 68% carbohydrate, 70% Dietary fibre, 17% protein and 2% lipid whereas Ulva lactuca contain 65% carbohydrate, 63 % Dietary fibre, 15% protein and 1.2% of lipid. The concentration of vitamin A is 0.5 and 0.6 IU, vitamin B1 is 5.22 and 5.85 mg/Kg and Vitamin B2 is 0.97 and 1.22 mg/kg respectively for Ulva lactuca and Ulva rigida. Photosynthetic pigments and mineral contents also higher in U. rigida. The seaweed U. rigida and U. lactuca were examined in this study has high protein, carbohydrate, and dietary fiber content but low in fat. Among the two species, U. rigida had a higher quantity of the nutrient contents than U. lactuca. The result of this study showed that both the species may be considered to be developed as an alternative source of healthy food for humans in the future.