Geometry Calculators
◆ Shapes & MeasurementsArea, volume, distance, slope and the right-angle maths behind real building work, with the formula and the working shown every time.
Slope Calculator
Slope, line equation y = mx + b, angle and distance from any two points.
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Volume Calculator
Cube, box, sphere, cylinder, cone and pyramid volumes with formulas and surface area.
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Cylinder Volume
V = πr²h with litres or gallons, base area and full surface area, steps included.
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Cone Volume
V = ⅓πr²h with slant height, lateral and total surface area shown step by step.
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Concrete Calculator
Work out how much concrete a slab, footing, column, round pad or flight of stairs needs, in cubic yards and cubic metres, with a waste allowance, bag counts and the total weight.
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Area Calculator
Area and perimeter for twelve shapes, from rectangle, triangle, circle, sector, ring, ellipse and trapezoid to polygons and L-shaped rooms, converted to square feet, square metres, acres and hectares at once.
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Pythagorean Theorem Calculator
Enter any two sides of a right triangle and get the third, with the working shown, a diagram drawn to scale, both angles, the area and the perimeter.
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Distance Calculator
Straight-line distance between two coordinates on a plane, in 3D space, or between two latitude and longitude points on Earth, with the working and every unit shown.
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Percentages, fractions, averages, ratios and scientific expressions.
Geometry calculators for classrooms, sites and workshops
The geometry calculators turn a handful of measurements into the number you actually need: how much floor to cover, how much concrete to order, how far apart two points really are. Each one draws on the standard formula and shows the substitution, so the answer can be checked rather than trusted blindly.
The area calculator handles twelve two-dimensional shapes and reports the perimeter alongside the area. The volume, cylinder and cone calculators cover the solids that come up most, and the concrete calculator converts a slab, footing or set of post holes straight into cubic yards, cubic metres and bags.
For the maths of angles and position, the Pythagorean theorem calculator solves any missing side of a right triangle, the slope calculator reports gradient, angle and rise over run, and the distance calculator works on a plane, in 3D space or across the surface of the Earth.
Frequently Asked Questions
Are these geometry calculators free to use?
Yes. Every geometry calculator here is 100% free, with no sign-up and no limits, and each one runs entirely in your browser.
Which units do the geometry calculators use?
Most of them are unit-agnostic, so if you enter metres the answer is in metres and if you enter feet the answer is in feet. The area, volume and concrete calculators also convert the result into the common trade units for you.
Do they show the formula behind the answer?
Yes. Each page states the formula it applied and prints the substitution, so you can follow the working or reproduce it by hand.
Is my data stored anywhere?
No. Everything is calculated locally in your browser, and nothing you type is uploaded, stored or shared.