Area of a Square Calculator A = side². Side Area 25 Step-by-step with your numbers: 1. Values used: 2. Side = 5 3. Area = Side squared = 5 x 5 = 25 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Square area. FAQ Perimeter? P = 4a. Related calculators Square Calculator Find a square's area, perimeter and diagonal. Perimeter of a Square Calculator P = 4a.