Geometry & Practical Projects
Areas, volumes, angles and real-world estimates for fences, roofs, stairs, shipping, trips and household budgets.
- Rectangle Area CalculatorCalculate the area, perimeter and diagonal of a rectangle from its length and width in any unit.
- Triangle Area CalculatorCalculate a triangle’s area from base and height, three sides (Heron’s formula) or two sides and the included angle.
- Circle Area CalculatorCalculate the area of a circle from its radius or diameter, with the circumference.
- Circle Circumference CalculatorCalculate a circle’s circumference from radius or diameter, or find the radius from a circumference or area.
- Sphere Volume CalculatorCalculate the volume and surface area of a sphere from its radius, with the capacity in litres.
- Cylinder Volume CalculatorCalculate the volume, curved and total surface area of a cylinder, with capacity in litres.
- Cone Volume CalculatorCalculate a cone’s volume, slant height and total surface area from its radius and height.
- Cube Volume CalculatorCalculate a cube’s volume, surface area and space diagonal from its side, or find the side from the volume.
- Cuboid Volume CalculatorCalculate the volume, surface area and space diagonal of a rectangular box (cuboid), with capacity in litres.
- Trapezoid Area CalculatorCalculate the area and midsegment of a trapezoid (trapezium) from its parallel sides and height.
- Parallelogram Area CalculatorCalculate a parallelogram’s area from base and height, or from two sides and the angle, with perimeter and diagonals.
- Polygon Interior Angle CalculatorFind the sum of interior angles, each interior and exterior angle, the number of diagonals and area of a regular polygon.
- Arc Length CalculatorCalculate the arc length and chord length of a circle segment from its radius and central angle in degrees or radians.
- Sector Area CalculatorCalculate the area of a circular sector and segment, and the sector perimeter, from radius and angle.
- Diagonal CalculatorCalculate the diagonal of a square, rectangle or box, including the longest straight object that fits inside a box.
- Fence Length EstimatorEstimate fence length, sections, posts and rails from the sides of your fence line and gates.
- Garden Area CalculatorCalculate a garden bed’s area and the volume and number of bags of mulch, compost or soil at a chosen depth.
- Staircase Dimension EstimatorEstimate the number of steps, riser height, total run, stringer length and pitch for a straight staircase.
- Roof Pitch CalculatorConvert roof pitch between rise-over-run (x:12), degrees and percent grade, with the rafter (slope) factor.
- Roof Area EstimatorEstimate roof surface area, roofing squares and shingle bundles from the building footprint, overhang and pitch.
- Packing Box Volume CalculatorFind how many identical items fit in a box in a grid, the best orientation, box volume and space used.
- Shipping Dimensional Weight EstimatorCalculate dimensional (volumetric) weight and the billable weight carriers charge, from package dimensions and a DIM divisor.
- Travel Fuel Budget CalculatorBudget fuel for a multi-day road trip from daily distances, consumption and fuel price, and see how far a budget goes.
- Trip Distance and Cost CalculatorTotal a trip’s cost from legs with distances and tolls, fuel, accommodation, food and parking, split per person.
- Personal Monthly Budget CalculatorBuild a monthly budget from income and spending tagged as needs, wants or savings, compared with the 50/30/20 guideline.
Quantities and costs are planning estimates. Add sensible allowances, and check with suppliers, carriers or professionals before buying, shipping or building.