Hobby and Craft

  • Resistor Color Code Calculator
    Convert 4-band resistor color codes to resistance in ohms. Pick the band colors and instantly get the value, tolerance, and min/max range.
  • Seed Starting Date Calculator
    Find exactly when to start seeds indoors. Enter your last frost date and the weeks-before figure from your seed packet to get the sowing date.
  • Raised Garden Bed Soil Calculator
    Calculate how much soil your raised garden bed needs in cubic feet, cubic yards, and number of bags. Free, fast, and supports multiple beds.
  • Fertilizer Application Calculator
    Calculate how many pounds of fertilizer to apply based on your target nitrogen rate per 1,000 sq ft, the bag's %N, and your lawn or garden area.
  • Firewood Cord Calculator
    Calculate how many cords of firewood you have from your stack's length, width and height in feet. Free, instant firewood cord calculator.
  • Epoxy Mix Ratio Calculator
    Calculate exact resin and hardener amounts for any epoxy mix ratio by volume or weight. Enter total amount and your part ratio to get precise quantities.
  • Ring Size Calculator (Diameter to US Size)
    Convert a ring's inner diameter (mm) to circumference and an approximate US ring size. Free, instant ring sizing calculator with the exact formula.
  • Guitar Capo Key Calculator
    Find the real sounding key when you put a capo on your guitar. Pick your open chord shape and capo fret to instantly see the transposed key.
  • Image Print Resolution (DPI) Calculator
    Calculate maximum print size from image pixels and DPI. Find print width and height in inches and cm at any print resolution.
  • Poker Pot Odds Calculator
    Calculate poker pot odds and the minimum equity you need to make a profitable call. Enter the pot size and the amount to call for instant odds.
  • Chess Elo Rating Change Calculator
    Calculate your new chess Elo rating after a game. Enter ratings, result and K-factor to see expected score, win probability and rating change.
  • Words Per Minute (WPM) Calculator
    Calculate your typing speed in words per minute. Enter characters typed, time, and errors to get gross WPM, net WPM, and accuracy instantly.
  • RGB to Hex Color Calculator
    Convert RGB color values (0-255) to a hex color code and decimal value instantly. Free RGB to hex converter with live color preview.
  • Wine & Beer ABV Calculator
    Estimate the alcohol by volume (ABV) of homemade wine, beer, mead or cider from original and final hydrometer gravity readings.
  • Epoxy Resin Coverage Calculator
    Calculate how much epoxy resin you need for any project. Enter length, width, and coating thickness to get volume in fluid ounces and gallons, with overage.
  • Fabric Yardage Calculator
    Calculate how many yards of fabric you need. Enter a total length, or piece dimensions and quantity, plus bolt width to get yards, feet and meters.
  • BPM Delay Time Calculator
    Convert tempo (BPM) to delay and reverb times in milliseconds for every note value — quarter, eighth, dotted, and triplet — for perfectly synced effects.
  • Filament Usage Calculator
    Calculate 3D printing filament weight, volume, and cost from length used. Supports PLA, ABS, PETG, TPU and 1.75/2.85/3.0 mm filament diameters.
  • Cake Portion Calculator
    Estimate how many servings a cake yields by shape, size, layers and serving style. Free cake portion calculator for parties and weddings.
  • Tile Calculator
    Calculate the exact number of tiles and boxes for any floor, wall, or backsplash. Accounts for grout gap, supports independent metric/imperial units for tile and surface, with a 5–10% overage recommendation and optional cost estimate.
  • Alcohol By Volume (ABV) Calculator
    Calculate the alcohol by volume (ABV%) of beer, wine, or mead from original and final gravity readings using the standard ABV = (OG − FG) × 131.25 formula.
  • Book Spine Width Calculator
    Calculate your book spine width from page count and paper thickness (PPI). Get spine size in inches and millimeters for print-ready cover design.
  • Image Aspect Ratio Calculator
    Free aspect ratio calculator. Enter original width and height plus a new width to find the proportional new height and simplest ratio (e.g. 16:9).
  • Aquarium Volume Calculator
    Calculate your fish tank volume in US gallons and liters from length, width, and height in inches. Free, instant aquarium capacity calculator.

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