Hobby and Craft

  • Tree Age Calculator
    Estimate the age of a tree from its trunk circumference or diameter and the species growth factor. Free, instant, non-invasive tree age calculator.
  • Tree Spacing Calculator
    Calculate trees per acre and total trees from row spacing and tree spacing. Free planting density calculator for orchards, forestry, and vineyards.
  • Concrete Calculator
    Calculate concrete volume, weight, and bag count for slabs, columns, and tubes. Supports mixed metric/imperial units, quantity multiplier, and 40/60/80-lb bag sizes.
  • Roofing Calculator
    Calculate actual sloped roof area from footprint and pitch (rise/run), with roofing squares, shingle bundles needed, waste buffer, and material cost.

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