Aquarium Gravel Calculator: Substrate, Bags and Cost
Calculate aquarium gravel, sand or soil volume, weight, whole bags and cost for level or sloped beds using density or manufacturer coverage.
Solve for X Fraction Calculator: Proportions and Steps
Solve proportions with x in any position. Get an exact fraction, mixed number, decimal, checked steps, and an advanced rational-equation solver.
Solar Panel Angle Calculator: Tilt, Direction and Row Spacing
Calculate solar panel tilt by latitude, season or date, with true-direction guidance, monthly solar-noon angles and optional row spacing.
Metal Roofing Calculator: Panels, Length, Trim and Cost
Estimate full-length metal roofing panels, slope length, roof area, ridge, eave and rake trim, fasteners and material cost in US or metric units.
Shower Tile Calculator: Walls, Floor, Boxes and Cost
Calculate shower wall, floor and ceiling tile with openings, niches, waste, tile pieces, whole boxes, purchased coverage and cost.