Surface Area Calculator
Calculate the surface area of 3D shapes with step-by-step solutions and unit conversions.
Cube Surface Area
Total Surface Area
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SA = 6a^2
Step-by-Step Calculation
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Enter values to see the calculation steps
sq in
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sq ft
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sq cm
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sq m
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Surface Area Formulas
Cube
SA = 6a^2
Rectangular Prism
SA = 2(lw + lh + wh)
Sphere
SA = 4 pi r^2
Cylinder
SA = 2 pi r^2 + 2 pi rh
Cone
SA = pi r^2 + pi rl
Square Pyramid
SA = a^2 + 2al
Triangular Prism
SA = bh + (b + s1 + s2)L
Frequently Asked Questions
How do I calculate the surface area of a sphere?
The surface area of a sphere is calculated using SA = 4 x pi x r squared, where r is the radius. Simply square the radius, multiply by pi (approximately 3.14159), and then multiply by 4.
What is the formula for the surface area of a cylinder?
The total surface area of a cylinder is SA = 2 x pi x r squared + 2 x pi x r x h, where r is the radius and h is the height. This includes both circular bases (2 x pi x r squared) and the lateral surface (2 x pi x r x h).
How do I find the surface area of a cone?
The surface area of a cone is SA = pi x r squared + pi x r x l, where r is the radius and l is the slant height. The first term is the base area and the second term is the lateral (curved) surface area.