Hobby and Craft

  • Fire Glass Calculator
    Estimate how many pounds of fire glass you need for your fire pit or fireplace based on its length, width, and the glass depth you want.
  • Log Weight Calculator
    Estimate the weight of a log or round timber from its diameter, length and wood density. Free calculator using the cylinder volume formula.
  • Gold Weight Calculator
    Calculate the weight of gold from its volume using gold's density (19320 kg/m³). Get results in grams, ounces, and troy ounces by karat.
  • BPM Calculator
    Calculate BPM (beats per minute) from beats counted over a time interval. Great for music tempo, heart rate, or any rhythmic count.
  • Bowl Segment Calculator
    Calculate miter angle, segment angle and segment length for segmented bowl turning rings. Enter segment count and ring radius to get exact saw angles.
  • Telescope Field of View Calculator
    Calculate your telescope's true field of view (TFOV) and magnification from focal lengths and eyepiece apparent field of view (AFOV).
  • Telescope Magnification Calculator
    Calculate telescope magnification from objective and eyepiece focal lengths. Also finds exit pupil. Free, instant, and easy to use.
  • Wood Fence Calculator
    Calculate materials needed for your wood fence project. This easy-to-use calculator determines the number of posts, rails, pickets, and concrete required based on your fence's length, height, and post spacing.
  • Epoxy Calculator
    Calculate how much epoxy resin you need for a surface by length, width, thickness and number of coats. Get gallons, fluid ounces and liters instantly.
  • Hoop House Calculator
    Calculate the arc length of a semicircular hoop and the total cover material (sq ft) needed for your hoop house or high tunnel by width and length.
  • Miter Angle Calculator
    Calculate the miter angle for any corner. Enter the corner angle and get the exact cut angle for each board plus the miter saw setting.
  • Camera Field of View (Shooting Range) Calculator
    Calculate a camera's angle of view and the physical shooting range (captured width, height and area) from lens focal length, sensor size and subject distance.
  • Camera Depth of Field Calculator
    Calculate camera depth of field from focal length, f-number, subject distance and circle of confusion. Get near/far focus limits and total DoF.
  • Camera Angle of View Calculator
    Calculate a camera lens horizontal, vertical and diagonal angle of view in degrees from focal length and sensor size, plus the 35mm-equivalent focal length.
  • Angle Cut Calculator
    Calculate the offset (rise) and diagonal cut length for a given run and cut angle. Free angle cut calculator for carpentry, trim, and metalwork.
  • Scale Calculator
    Convert between real size and scaled size using any scale ratio (1:N). Perfect for model building, maps, drawings and architecture.
  • Tablecloth Size Calculator
    Calculate the ideal tablecloth size from your table dimensions and desired drop. Get the exact length and width you need for any rectangular table.
  • Balloon Arch Calculator
    Estimate how many balloons you need for an arch. Enter arch length, balloon diameter, and balloons per cluster to get a quick, accurate total.
  • Bean Bag Filling Calculator
    Calculate how many litres or cubic feet of bean bag filler beads you need based on your bag's shape and dimensions, filled about two-thirds full.
  • Belt Size Calculator
    Use the Belt Size Calculator to find your correct belt size from your waist measurement. Quick, accurate rule: belt size = waist size + 2 inches.
  • Beer ABV Calculator
    Calculate beer ABV from original gravity (OG) and final gravity (FG) using the standard ABV% = (OG − FG) × 131.25 homebrew formula.
  • Fabric Calculator
    Calculate how many yards of fabric you need from the total area and the usable fabric width. Free, fast estimator for sewing and upholstery projects.
  • Half Square Triangle Calculator
    Calculate the cut square size for half square triangles. Just add 7/8" to your finished HST size to get the perfect starting square for quilting.
  • Quilt Calculator
    Free quilt calculator. Enter your quilt width, height and block size to find how many blocks you need across, down and in total.

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