These calculators find the surface area of common three-dimensional shapes in seconds. Enter your dimensions to get results for a sphere, cone, cube, pyramid, or triangular prism — and choose between total surface area or lateral-only figures where the distinction matters, as with the Cone Lateral Surface Area Calculator and Pyramid Lateral Surface Area Calculator.
Browse the most-popular list to see which shapes come up most in coursework and real projects, or open the Trending tab for what's being used right now. All calculators are free, need no sign-up, and work on any phone, tablet, or desktop.
- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
-
Cube Surface Area CalculatorEnter a cube’s side length to instantly calculate its total surface area (A = 6s²). Quick help for geometry, homework, and simple planning.
-
Annulus (Ring) Area CalculatorCalculate the area of an annulus (ring) from its outer and inner radii using A = π(R² − r²). Also shows ring width and circumferences.
-
Surface Area of a Rectangular Prism CalculatorCalculate the surface area of a rectangular prism (cuboid) from its length, width, and height using A = 2(lw + lh + wh). Free and instant.
-
Surface Area of a Square Pyramid CalculatorCalculate the total surface area of a square pyramid from its base edge and height. Includes base area, lateral area, and slant height instantly.
-
Surface Area of a Cone CalculatorCalculate the total surface area of a cone from its base radius and height. Get base area, lateral area, slant height and total area instantly.
-
Wall Paint Surface Area CalculatorCalculate the wall surface area of a room and the paint needed. Deducts doors and windows from the gross area to give net square feet and gallons.
-
Heron's Formula Area CalculatorFind a triangle's area from its three side lengths using Heron's formula. Enter sides a, b, and c to get the area, semi-perimeter, and perimeter instantly.
-
Right Triangle Area CalculatorCalculate the area of a right triangle from its two legs using A = ½·a·b. Also returns hypotenuse and perimeter instantly.
-
Regular Hexagon Area CalculatorCalculate the area of a regular hexagon from its side length using A = (3√3/2)s². Also returns perimeter and apothem instantly.
-
Triangle Area CalculatorCalculate the area of a triangle from its base and height using A = ½·b·h. Fast, free, and accurate for any unit of measurement.
-
Square Area CalculatorCalculate the area of a square instantly with A = s². Enter the side length and get area, perimeter, and diagonal in seconds.
-
Circle Area CalculatorCalculate the area of a circle instantly with A = πr². Enter the radius to get area, diameter, and circumference in seconds.
-
Triangle Area (SAS) CalculatorFind the area of a triangle from two sides and the included angle (SAS) using A = ½·a·b·sin C. Enter sides a, b and angle C in degrees.
-
Land Area Calculator (Square Feet to Acres)Convert a plot's length and width in feet to acres instantly. Enter dimensions and get area in acres, square feet, and square meters.
-
Roof Surface Area CalculatorCalculate total roof surface area, slope factor, and roofing squares from your building footprint and roof pitch (rise/run). Free and accurate.
-
Surface Area of a Cylinder CalculatorCalculate the total surface area of a cylinder from its radius and height using SA = 2πr² + 2πrh. See lateral and base areas instantly.
-
Cylinder Lateral Surface Area CalculatorCalculate the lateral (curved) surface area of an open cylinder using A = 2πrh. Enter radius and height for instant results in square units.
-
Floor Area CalculatorCalculate floor area and square footage instantly. Enter length and width to get area in square feet, square meters, and square yards.
-
Swimming Pool Surface Area CalculatorCalculate the water surface area of a rectangular swimming pool from its length and width. Get results in square feet and square meters instantly.
-
Triangular Pyramid (Tetrahedron) Surface Area CalculatorCalculate the surface area of a triangular pyramid (tetrahedron) from base edge and slant height. Free, instant SA = (√3/4)·a² + (3/2)·a·l calculator.
-
Curved Surface Area of a Cylinder CalculatorCalculate the curved (lateral) surface area of a cylinder instantly using CSA = 2πrh. Enter the radius and height to get the result in square units.
-
Surface Area of a Cube CalculatorCalculate the total surface area of a cube from its edge length using SA = 6s². Also shows the area of one face and the cube's volume.
-
Surface Area of a Sphere CalculatorCalculate the surface area of a sphere from its radius using SA = 4πr². Instantly get surface area, diameter, and volume for any sphere.
-
Tile Area CalculatorCalculate how many tiles you need for a floor or wall. Enter room and tile dimensions plus a wastage allowance to get the exact tile count.
Frequently asked questions
Which 3D shapes does this collection cover?
The collection covers spheres (including the Ball Surface Area Calculator), cones, cubes, square and triangular pyramids, and triangular prisms. Both full surface area and lateral surface area variants are available for cones and pyramids — useful when the base area needs to be excluded from the figure.
What is the difference between total surface area and lateral surface area?
Total surface area includes every face of a shape — the base or bases combined with all side faces. Lateral surface area covers only the side faces, leaving out the base or bases. This distinction matters in practical contexts such as calculating material needed to wrap the sides of a cone or coat the slanted faces of a pyramid.
How accurate are the results?
All formulas follow standard geometric definitions — for example, 4πr² for a sphere and half the perimeter times the slant height for pyramid lateral area. Results are as precise as the dimensions you supply. For construction, packaging, or engineering applications, double-check critical figures against governing standards or have a qualified professional review them.
Do you store the measurements I enter?
No. Calculations run entirely in your browser. No dimensions or computed results are sent to our servers or saved after you close or refresh the page.
Which surface area calculators are most popular?
The list is ordered by real visitor usage — the Sphere and Cone Surface Area calculators tend to rank near the top. Open the Trending tab to see which tools are getting the most attention right now.
