From figuring out how many tiles to order to cutting the perfect circle skirt, this collection handles the math behind hands-on projects. The Roofing Calculator, Concrete Calculator, Wood Fence Calculator, and Mulch Calculator are perennial favorites for DIYers and homeowners, while the Circle Skirt Calculator, Gravel Calculator, and Soil Calculator round out the range for crafters and landscapers.
Browse the Popular list to see which project calculators other makers rely on most, or check the Trending tab for seasonal favorites. Every tool is free and works on any device, so you can pull it up right at the hardware store or the sewing table.
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Paper Thickness (Stack Height) CalculatorCalculate 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.
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Circle Skirt CalculatorEnter your waist circumference and desired skirt length, choose full, 3/4, half, or quarter style, and get the cut measurements for your pattern.
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Gravel CalculatorCalculate gravel volume and weight with this gravel calculator. Input area dimensions, gravel depth, and density for accurate estimates. Save time and money on your landscaping projects.
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Epoxy Mix Ratio CalculatorCalculate 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.
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Camera Field of View (Shooting Range) CalculatorCalculate 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.
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Gift Wrap Paper CalculatorCalculate the exact wrapping paper sheet size needed for any gift box. Enter box length, width, height and overlap to get paper width, length and area.
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LED Strip Length, LED Count & Power Draw CalculatorCalculate LED strip power draw, total LED count and current. Enter strip length, LEDs per meter, watts per LED and voltage to size your power supply.
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Paper Weight CalculatorCalculate the total weight of paper from sheet size, grammage (gsm) and number of sheets. Get weight in grams and kilograms instantly.
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3D Printer Filament Length-to-Weight CalculatorConvert 3D printer filament length to weight in grams. Enter length, diameter (1.75mm/2.85mm) and material density to estimate spool usage instantly.
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Gold Weight CalculatorCalculate the weight of gold from its volume using gold's density (19320 kg/m³). Get results in grams, ounces, and troy ounces by karat.
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Pixels to Print Size CalculatorConvert image pixel dimensions to print size in inches and centimeters at a chosen DPI/PPI. Find the largest quality print your photo can make.
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Camera Angle of View CalculatorCalculate a camera lens horizontal, vertical and diagonal angle of view in degrees from focal length and sensor size, plus the 35mm-equivalent focal length.
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Loom Rubber Band Bracelet CalculatorCalculate how many beads you need for a bracelet based on wrist size, bead diameter, and ease. Free, instant bead count calculator for jewelry makers.
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Paint-by-Numbers Acrylic Paint Coverage CalculatorEstimate how much area your acrylic paint covers from mL and coverage per mL. Adjusts for multiple coats. Great for paint-by-numbers and craft projects.
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Tile CalculatorCalculate 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.
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Hammock Hang CalculatorCalculate hammock anchor height, center sag and strap tension from distance, hang angle and body weight. Get the ideal 30-degree hang fast.
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Cake Portion CalculatorEstimate how many servings a cake yields by shape, size, layers and serving style. Free cake portion calculator for parties and weddings.
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Resistor Color Code CalculatorConvert 4-band resistor color codes to resistance in ohms. Pick the band colors and instantly get the value, tolerance, and min/max range.
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Seed Starting Date CalculatorFind 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.
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Raised Garden Bed Soil CalculatorCalculate how much soil your raised garden bed needs in cubic feet, cubic yards, and number of bags. Free, fast, and supports multiple beds.
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Firewood Cord CalculatorCalculate how many cords of firewood you have from your stack's length, width and height in feet. Free, instant firewood cord calculator.
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Guitar Capo Key CalculatorFind 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.
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Image Print Resolution (DPI) CalculatorCalculate maximum print size from image pixels and DPI. Find print width and height in inches and cm at any print resolution.
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Poker Pot Odds CalculatorCalculate 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.
Frequently asked questions
What kinds of hobby and DIY projects can I plan with these calculators?
The collection covers outdoor and landscape projects (mulch, gravel, soil volume, wood fencing), construction and renovation (roofing area, concrete volume, tile quantity), and craft and sewing (circle skirt fabric). Whether you are ordering materials in bulk or double-checking a cut, there is a fitting tool here.
How reliable are the material estimates?
All calculators use standard construction and craft formulas to give you a solid starting point for ordering and planning. Results are estimates — actual quantities may vary with waste, overlap, and site conditions. For safety- or code-critical work such as structural roofing or load-bearing concrete, verify against the governing building standard and have a qualified contractor or engineer review your plans.
Are these calculators free?
Completely free. There are no fees, no accounts to create, and no limits on how many times you can use any tool. Enter your dimensions and get your answer instantly — then tweak the figures as many times as you need.
Does the site save the measurements I enter?
No. All calculations run in your browser. Your measurements, quantities, and project details are never sent to or stored by our servers — feel free to enter real dimensions without concern.
Which DIY calculators do people use most?
The default listing ranks tools by how often real users reach for them, so the most useful calculators surface first. The Trending tab is especially handy around renovation season, when certain project tools spike sharply in popularity.
