Angle, Slope & Navigation 2
- DMS to Decimal Degrees Converter (and DDM)ConverterConvert coordinates between degrees-minutes-seconds, degrees and decimal minutes and decimal degrees, in every direction, for latitude…
- Slope and Grade Converter (%, Degrees, 1:12, Roof Pitch)ConverterConvert a slope between per cent grade, degrees, a 1 in n ratio, millimetres per metre,…
Chemistry & Solutions 4
- Gas Concentration Converter (ppm ⇄ mg/m³)Converterppm to mg/m³ for gases and vapours, with molar masses computed from the IUPAC atomic weights…
- Percent Concentration Converter (% w/w, % w/v, % v/v, mg/mL)Converter% w/w, % w/v, % v/v, mg/mL, ppm and molarity, joined by the one number that…
- pH, pOH and Hydrogen Ion ConverterConverterpH ⇄ pOH ⇄ [H⁺] ⇄ [OH⁻] with temperature as a real input, because pH +…
- Water Hardness Converter (ppm, gpg, °dH, °fH, °e)ConverterEvery water hardness unit against every other — mg/L as CaCO3, grains per gallon, German, French…
Clothing, Shoe & Body Sizing 9
- Belt Size ConverterConverterTrouser waist to belt size in inches and centimetres — and the fact everybody gets wrong:…
- Bra Size ConverterConverterUK, US, EU, French, Italian, Japanese and Australian bra sizes, both parts converted separately — because…
- Children’s Shoe Size ConverterConverterUS, UK, EU and Japanese children's shoe sizes from the one thing that means anything —…
- Clothing Size ConverterConverterUK, US, EU, French, Italian, Japanese and Australian clothing sizes, for women and men, converted through…
- Glove Size ConverterConverterHand circumference to numeric glove size, S/M/L and the EN ISO 21420 protective-glove sizes — built…
- Hat Size ConverterConverterHead circumference in centimetres and inches, the US fitted scale, the UK scale, the EU number…
- Jeans and Waist Size ConverterConverterW and L labels against EU, UK and Italian sizes, for men and women — and…
- Ring Size ConverterConverterUS and Canadian numeric sizes, UK and Australian letters, EU and ISO 8653 circumference sizes, Japanese…
- Shoe Size ConverterConverterUS, UK, EU, Japanese and centimetre shoe sizes, for men, women and children, converted through the…
Engineering & Materials 4
- Density and Specific Gravity ConverterConverterTwelve density units derived from exact definitions — including the pound per US gallon and the…
- Hardness Scale Converter (HV, HB, HRC, HRB, Knoop)ConverterVickers, Brinell, Rockwell C and B and Knoop for non-austenitic steel — and a refusal for…
- Surface Roughness Converter (Ra, µin, CLA, RMS, Rz, N Grade)ConverterRa in micrometres and microinches, CLA, AA, RMS and the ISO N grades — with a…
- Viscosity Converter (Dynamic and Kinematic)ConverterDynamic and kinematic viscosity are different quantities and ν = µ / ρ, so converting between…
Kitchen & Cooking 19
- Air Fryer Conversion CalculatorCalculatorConvert an oven recipe to air fryer settings, and back, with each manufacturer's own published rule…
- Brine Calculator (Equilibrium, Wet and Dry)CalculatorHow much salt for a brine, on all three bases that are actually used — equilibrium…
- Butter Converter (Sticks, Cups, Tablespoons, Grams)ConverterConvert butter between US sticks, cups, tablespoons, grams, ounces and the European 250 g block, in…
- Can and Jar Size Converter (#10, #303, #2½)ConverterTurn the old US commercial can numbers — No. 1, No. 2, No. 2½, No. 300,…
- Chocolate and Cocoa ConverterConverterSwap between unsweetened chocolate, cocoa powder, bittersweet bars and chips by mass balance on cocoa solids…
- Coffee Brew Ratio CalculatorCalculatorDose, water and yield for pour-over, drip, French press, immersion, AeroPress, cold brew and espresso —…
- Cream Fat Content ConverterConverterWhat “cream” means in the US, UK, France, Australia and India, with the legal minima quoted…
- Cups to Grams Converter (by Ingredient)ConverterConvert cups, tablespoons, teaspoons and millilitres to grams and ounces for 26 named ingredients, in both…
- Dough Hydration Calculator (Baker’s Percentage)CalculatorBaker's percentage in both directions — flour weight to every other weight, and a target total…
- Meat Cooking Temperature Converter (°C, °F, Doneness)ConverterInternal temperatures for meat by food and by doneness, in °C and °F both ways, with…
- Oven Temperature Converter (°C, °F, Gas, Fan)ConverterConvert between °C, °F, gas mark and a fan oven setting in any direction, with the…
- Recipe Scaling Calculator (Servings or Tin Size)CalculatorScale a recipe by servings or by tin size, with the area arithmetic shown, the new…
- Rice Water Ratio Calculator (By Type and Method)CalculatorWater per cup of rice for twelve kinds of rice and five cooking methods, with the…
- Roast Cooking Time CalculatorCalculatorRoasting time by weight from USDA FSIS's own charts, reproduced in full because they are US…
- Salt Conversion Calculator (Table, Kosher, Sea)CalculatorConvert between table salt, Morton coarse kosher, Diamond Crystal kosher and fine sea salt by volume…
- Spoon Measure ConverterConverterTablespoons, teaspoons and dessertspoons between the US customary, US legal, metric, modern UK, historic imperial and…
- Sugar Substitute Converter (Honey, Stevia, Erythritol)ConverterSwap granulated sugar for honey, maple, agave, molasses, brown and coconut sugar, stevia, erythritol, xylitol, allulose,…
- US, UK and Metric Kitchen Measures ConverterConverterConvert every common kitchen volume measure between US customary, imperial, metric and Australian conventions, in any…
- Yeast Conversion Calculator (Fresh, Active Dry, Instant)CalculatorConvert between fresh compressed yeast, active dry yeast and instant yeast by weight or by the…
Land & Area Measure 3
- Bigha Converter — State by StateConverterHow big is a bigha? Between 6,806 and 27,225 square feet, depending on which state's revenue…
- Indian Land Area ConverterConverterConvert between every Indian land unit — cent, guntha, bigha, katha, biswa, kanal, marla, ground, ankanam,…
- Land Price per Unit ConverterConverterIndian listings quote land prices in whichever unit suits the seller — per cent, per square…
Light, Sound & Radiation 5
- Lux to PPFD Converter (by Light Source)ConverterLux to PPFD and back for eleven named light sources, with the measured factor for each…
- Lux, Lumens and Candela ConverterConverterLumens, candela, lux and foot-candles in every direction, through the solid angle and the distance that…
- Noise Exposure Dose Calculator (OSHA, NIOSH, EU)CalculatorOccupational noise dose under all three regimes at once — OSHA's 5 dB exchange rate, NIOSH's…
- Radiation Dose Converter (Gy, rad, Sv, rem, R)ConverterGray, rad, sievert, rem, roentgen and C/kg — with the exact conversions separated from the two…
- Sound Pressure Level Converter (dB, Pa, W/m²)ConverterdB SPL to pascals to sound intensity and back, with the 20 µPa and 1 pW/m²…
Numbers & Notation 6
- Aspect Ratio Calculator (Resolution, Letterbox, Named Ratios)CalculatorReduce any resolution to lowest terms with a real greatest common divisor, find the nearest named…
- Hex to RGB Converter — with HSL, Relative Luminance and WCAG ContrastConverterPaste a hex colour and get R, G and B, the HSL triple, the sRGB relative…
- Inch Fraction Converter (Decimal and mm to 1/16, 1/32, 1/64)ConverterDecimal inches or millimetres to the nearest fraction on a tape measure, with the residual printed…
- kB vs KiB Converter — Why 1 TB Shows as 931 GBConverterDecimal kB, MB, GB, TB against binary KiB, MiB, GiB, TiB, with bits in the same…
- Number Base Converter — Binary, Octal, Decimal, Hex, Any Base 2 to 36ConverterType a number in any base from 2 to 36 and read it back in any…
- Roman Numeral Converter (Both Ways, 1 to 3999)ConverterType a number and get the numeral; paste a numeral and get the number. The card…
Print & Typography 6
- DPI and Print Size Calculator (Pixels to Inches, Both Ways)CalculatorPixels to printed size and back, at whatever resolution you choose — plus the part that…
- em, rem and px Converter (CSS Relative Units)Converter1.5em is not a length until you know the parent's font size, and 1.5rem is not…
- Paper Size Converter (A4, Letter, ANSI, ARCH, and Pixels)ConverterEvery ISO 216 A, B and C size, the DIN overformats, and the North American named,…
- Paper Weight Converter: GSM to lb (Bond, Text, Cover, Index)ConverterUS basis weight is not a unit — it is the weight of 500 sheets at…
- Screen Size and Viewing Distance CalculatorCalculatorDiagonal plus aspect ratio to width, height, area and PPI — because a 34-inch ultrawide has…
- Typographic Units Converter (Points, Picas, Didot, Pixels)ConverterThere are at least four different points in print and they are up to 7% apart:…
Time & Calendar 3
- Hijri to Gregorian Converter (Tabular Islamic Calendar)ConverterHijri ⇄ Gregorian through the Julian day number, with all four published 30-year intercalation schemes and…
- ISO Week Number Calculator (and the Two Conventions That Disagree)CalculatorISO 8601 week number, week-based year, day of week and day of year — beside the…
- Time to Decimal Hours ConverterConverterHours and minutes to decimal hours and back, in any increment — with the US Department…
Vehicle & Transport 3
- Running Pace Converter (min/km, min/mile, km/h, mph)ConverterConvert between minutes per kilometre, minutes per mile, km/h and mph in every direction, get finish…
- Tyre Size ConverterConverter205/55 R16 into section width, sidewall height, overall diameter, rolling circumference and revolutions per kilometre —…
- Wheel Offset and Backspacing ConverterConverterET in millimetres to backspacing in inches and back, with the half-inch-a-side rim flange allowance that…
Wire, Textile & Trade Gauges 9
- Drill Bit Size ConverterConverterFractional inch, number (1–80), letter (A–Z) and metric drill sizes, all converted through diameter and all…
- Fabric GSM ConverterConverterg/m², oz/yd² and ounces per LINEAR yard — and the third of those depends on the…
- Nail Size ConverterConverterPenny sizes (2d, 6d, 16d) to length in inches and millimetres, shank diameter and wire gauge…
- Needle Gauge ConverterConverterThree completely unrelated needle sizing systems in one place, because a search for "needle gauge" returns…
- Sheet Metal Gauge ConverterConverterGauge number to thickness in millimetres and inches, and back — for uncoated steel, galvanised steel,…
- Thread Pitch and TPI ConverterConverterMetric pitch to threads per inch and back, with the standard ISO coarse and fine pitches…
- Wire Gauge Converter — AWG and SWGConverterAWG, SWG, millimetres of diameter, square millimetres of area and circular mils, in both directions —…
- Wood Screw Size ConverterConverterScrew gauge number to shank diameter in inches and millimetres and back, with the metric equivalent…
- Yarn Count ConverterConvertertex, decitex, denier, Nm, Ne, worsted, linen lea and the woollen counts, all in one place…
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