Hobby and Craft

  • Hammock Hang Calculator
    Calculate hammock anchor height, center sag and strap tension from distance, hang angle and body weight. Get the ideal 30-degree hang fast.
  • Clay Shrinkage Calculator
    Calculate clay shrinkage rate or fired size for pottery. Find linear shrinkage % from wet and fired dimensions, or predict the fired size from a known rate.
  • Tent Size Calculator
    Calculate the right tent floor area for your group. Enter number of people and comfort level to get recommended m² and square footage instantly.
  • Paper Thickness (Stack Height) Calculator
    Calculate the total stack height of a pile of paper from the number of sheets and the caliper (thickness) per sheet, in mm, cm or inches.
  • 3D Print Time Estimator
    Estimate 3D print time from model height, layer height and average time per layer. Get total layers, hours, minutes and seconds instantly.
  • 3D Printing Cost Calculator
    Free 3D printing cost calculator. Estimate filament, electricity, and labor cost per print from grams, print hours, power draw, and rates.
  • 3D Printing Time & Cost Calculator
    Estimate the true cost of a 3D print: filament material cost plus electricity from print time and printer wattage. Free, instant, currency-agnostic.
  • 3D Printing Filament Cost Calculator
    Calculate the cost of a 3D print from filament weight, spool price and electricity. Find filament cost, energy cost and total cost per print fast.
  • Archery Draw Length Calculator
    Find your archery draw length from your arm span using the wingspan ÷ 2.5 method. Enter your wingspan in inches for an instant draw length estimate.
  • Pizza Size Calculator
    Compare two pizza sizes by area. See how much more food a larger pizza gives and which size is the better deal — diameter to area in seconds.
  • Self-Rising Flour Calculator
    Make your own self-rising flour. Enter cups of all-purpose flour to get the exact baking powder and salt to add. Fast, accurate DIY substitute.
  • Pancake Recipe Calculator
    Free pancake recipe calculator that scales flour, milk, eggs and more by servings and pancakes per person. Get exact ingredient amounts instantly.
  • Priming Sugar Calculator
    Calculate how much corn sugar (dextrose) to add for bottle-conditioning beer. Enter volume, target CO₂ and temperature to get grams of priming sugar.
  • SO₂ Wine Calculator
    Calculate how much potassium metabisulfite (KMS) to add to your wine to reach a target free SO₂ level, based on volume and current SO₂ in ppm.
  • Fresh to Dry Herb Conversion Calculator
    Convert fresh herbs to dried in any recipe. Uses the standard 3:1 ratio — divide fresh by 3 to get the equivalent dried amount. Free and instant.
  • Silver Melt Value Calculator
    Calculate the silver melt value of coins, bars and scrap from weight, fineness and spot price. Supports grams, troy & avoirdupois ounces and kilograms.
  • Scrap Silver Value Calculator
    Calculate the value of scrap silver from weight, fineness, spot price, and dealer payout. Get melt value and expected payout in seconds.
  • Scrap Gold Value Calculator
    Estimate the value of scrap gold by weight, karat purity, current spot price and dealer payout percentage. Get full melt value and per-gram price.
  • Gold Melt Value Calculator
    Calculate the intrinsic melt value of gold from weight, karat purity, and the current spot price per troy ounce. Supports grams, pennyweight, and troy ounces.
  • CO₂ Grow Room Calculator
    Calculate the cubic feet of CO₂ needed to enrich your grow room to a target ppm. Enter room dimensions, target and ambient CO₂ levels.
  • Compost Calculator
    Calculate how much compost you need in cubic yards and cubic feet from your garden bed area and desired application depth.
  • Pine Straw Calculator
    Estimate how many pine straw bales you need for your landscape beds. Enter bed size and mulch depth to get bales and estimated cost.
  • Plant Spacing Calculator
    Calculate how many plants fit in a garden bed based on spacing and area. Supports square and triangular (hexagonal) planting layouts.
  • Potting Soil Calculator
    Calculate how much potting soil you need for round or rectangular pots and planters. Get total liters, cubic feet and dry quarts for any number of containers.

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