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Geometry & Formulas

The area of a circle is A = πr². Learn the formula, how to find area from diameter or circumference, plus worked examples in cm², in² and mm².

Geometry & Basics

How many faces does a cylinder have? The clear answer is 3: two flat bases and one curved side. Plus 2 edges, 0 vertices, and why 2 or 0 appear.

Formulas & Calculations

Calculate a cylinder's capacity in gallons and cubic feet with V = 0.7854 x D² x H, worked examples, and a full conversion table.

Timber & Wood Calculation

Learn how to calculate volume of round timber logs using the cylinder, Smalian, Huber, Newton and Hoppus formulas, with worked examples.

Formulas & Calculations

Find the volume of a cylinder using diameter with V = πd²h/4. Worked examples in cm, inches, liters and gallons, plus the common mistake to avoid.

Guides

Calculate hydraulic cylinder rod volume and its effect on fluid displacement. Extend vs retract formulas, worked examples, and regeneration math.

Guides

Learn how to find the volume of a wire spool using V = π(R²−r²)h. Worked metric & imperial examples, plus wire-capacity and fill-factor math.

Guides

Steel coil volume = π/4 × (OD² − ID²) × width. Get the hollow-cylinder formula, worked metric & imperial examples, plus coil weight and length.

Guides

Pipe insulation volume = π × length × thickness × (pipe OD + thickness). Formula, 4 worked examples, and a unit conversion cheat sheet included.

Guides

Calculate transformer cylindrical tank oil capacity with V=πr²h. Worked examples, oil expansion formula, and conservator sizing explained.

Guides

Calculate industrial silo volume with the cylinder + cone formula. Worked examples, bushel & tonne conversions, plus grain bulk density tables.

Guides

Calculate the volume of a partially filled tilted cylinder with verified formulas, worked examples, and the centerline shortcut V = πr²h.