Makers calculators
Knitting, baking, 3D printing, music, home, and electronics tools that run in the browser. Formulas are documented on each page and do not need a server.
Craft
Gauge, yarn, needle sizes, cross stitch fabric, and quilt layout.
Knitting Gauge Calculator
Converts a knitting gauge swatch into cast-on stitches and a pattern adjustment factor.
Crochet Gauge Calculator
Converts a crochet gauge swatch into stitch counts and a pattern adjustment factor.
Yarn Calculator
Estimates yarn grams, yards, and 100 g skeins for a blanket, scarf, or hat.
Needle Size Converter
Converts knitting needle and crochet hook sizes across millimetres, US, UK, and Japan.
Cross Stitch Fabric Calculator
Cuts Aida or evenweave fabric size from stitch counts, fabric count, and over 1 or 2.
Quilt Size Calculator
Adds quilt blocks, sashing, borders, and a bed drop to a finished size in inches and centimetres.
Kitchen
Pan volumes, cups to grams, sourdough hydration, coffee ratios, and cake servings.
Baking Pan Size Converter
Scales batter between round, square, rectangular, loaf, and bundt pans by volume.
Cups to Grams Converter
Converts cups and grams for flour, butter, sugar, rice, and other baking ingredients.
Sourdough Hydration Calculator
Turns baker’s percentages into flour, water, starter, and salt weights.
Coffee Ratio Calculator
Sets pour-over, French press, cold brew, and espresso ratios in grams.
Cake Serving Calculator
Counts party and wedding slices from round or rectangular tiers.
3D printing and making
Filament length, print cost, epoxy volume, and candle wax load.
Filament Weight to Length
Converts 3D-printer filament grams to metres using published material density and diameter.
3D Print Cost Calculator
Prices a print from filament mass, printer watts, electricity rate, and optional slicer comments.
Epoxy Resin Calculator
Fills a slab, cylinder, oval, or river table and splits the volume into an A:B mix.
Candle Wax Calculator
Estimates soy or paraffin wax and fragrance load from container volume in ounces.
Home
Aquarium volume, board feet, wallpaper rolls, and miter angles.
Aquarium Volume Calculator
Finds litres and gallons for rectangular, bowfront, cylinder, hexagon, and corner tanks.
Board Feet Calculator
Counts lumber board feet and log scale with Doyle, Scribner, and International ¼″.
Wallpaper Calculator
Estimates rolls with pattern repeat, straight match, or half-drop.
Miter Angle Calculator
Finds polygon, picture-frame, and compound crown-molding miter and bevel angles.
Music and video
BPM delay times, chord transpose, note frequency, and file size.
BPM to MS Calculator
Converts tempo to delay and reverb times, with tap tempo and note divisions.
Chord Transposer
Transposes pasted chord sheets by semitones and shows a capo-friendly chart.
Frequency to Note Converter
Maps hertz to piano notes, cents, and MIDI at A4 = 440 or 432.
Video File Size Calculator
Estimates recording size from bitrate and duration, or bitrate from a target size.
Electronics and converters
Resistor color codes, LED resistors, Roman dates, Morse, and barbell plates.
Resistor Color Code Calculator
Reads 4, 5, and 6 band resistors and converts a value back to colors.
LED Resistor Calculator
Sizes a series resistor for LEDs and solves a two-resistor voltage divider.
Roman Numeral Date Converter
Converts dates to Roman numerals with a tattoo-style preview and PNG export.
Morse Code Translator
Encodes and decodes Morse, then plays the pattern as audio in the browser.
Barbell Plate Calculator
Splits a target weight across plates on a kg or lb bar and draws the loaded bar.
CSS and type
Fluid clamp(), px to rem, and Tailwind shade tokens.
CSS Clamp Generator
Builds clamp() fluid type and spacing, with a modular type-scale tab.
PX to REM Converter
Converts pixels to rem and em at a chosen root font size, with a common-size table.
Tailwind Color Generator
Builds 50–950 OKLCH shades and Tailwind v4 @theme tokens from a seed hex.
Image utilities
Color-blind simulation, ICO, SVG raster, print size, drawing grids, and pixel art.
Color Blindness Simulator
Simulates protanopia, deuteranopia, and tritanopia on a palette or an uploaded image.
PNG to ICO Converter
Packs a PNG into a multi-size .ico with 16, 32, 48, and 256 px layers.
SVG to PNG Converter
Rasters an SVG to a transparent PNG at a chosen width in the browser.
Photo Print Size Calculator
Converts pixel dimensions to inches and centimetres at a chosen DPI.
Drawing Grid Maker
Overlays a measured grid on a photo for transfer drawing, with print output.
Pixel Art from Image
Downsamples a photo to a pixel grid for bead, Minecraft, or cross-stitch planning.