CalcChef tool collection
Conversion Tools
Make everyday measurements and project estimates easier with quick, transparent conversions for common units and practical jobs.
Start with these tools
Honey Weight to Volume Converter
1 cup of honey weighs 339 g (USDA). Convert honey between cups, tablespoons, teaspoons, mL or fl oz and grams, ounces or pounds, with an editable density.
Halogen Wattage Converter
Convert halogen or incandescent bulb wattage to equivalent LED wattage and lumens
Unit Converter
Convert length, weight, temperature, area, volume, speed, power, pressure, energy, data, time and force units. 1 mile is exactly 1.609344 km.
Frequency Converter
Frequency converter for Hz, kHz, MHz, GHz, THz, RPM, BPM, and more, with wavelength, period, musical note, and EM-band readouts.
Volume Converter
Convert liters, dL and cL, US and Imperial gallons, quarts, pints and fluid ounces, US cups and spoons, and cubic feet. 1 US gallon is 3.785411784 L.
Speed Converter
Convert speed between mph, km/h, m/s, knots, ft/s and Mach (343 m/s): 60 mph is 96.56064 km/h, 26.8224 m/s and 88 ft/s.
Concrete Calculator
Concrete calculator for square and round slabs, footings and columns: cubic yards or m³, bags of 40 to 80 lb or 20 and 25 kg (exact and rounded up), weight.
Area Converter
Convert square meters, square feet, acres, hectares, square miles, yards, inches, cm and mm with exact factors. 1 acre is 43,560 square feet.
All Conversion Tools
39 free browser-based tools
Acceleration Converter
Convert acceleration units like m/s², g-force, and ft/s². Physics and automotive engineering tool.
Area Converter
Convert square meters, square feet, acres, hectares, square miles, yards, inches, cm and mm with exact factors. 1 acre is 43,560 square feet.
ASCII to Hex Converter
Text to hex and back: ASCII characters become two-digit codes, and é, € or emoji become code points or UTF-8, UTF-16 or Windows-1252 bytes.
Bra Size Converter
Convert a bra size between US, UK, EU, French and AU systems by list position: US 34C is EU 75C. Shows sister sizes.
Brick and Mortar Count Calculator
Bricks per square foot and for a wall from eight brick sizes or your own, in US or metric units, plus mortar, 80 lb premix bags or cement and sand, and cost.
Candela to Lumens Converter
Turns peak candela into lumens, or lumens into candela, for a beam of up to 180°, and works out lux and foot-candles at a distance or over an area.
Concrete Calculator
Concrete calculator for square and round slabs, footings and columns: cubic yards or m³, bags of 40 to 80 lb or 20 and 25 kg (exact and rounded up), weight.
Cooking Measurement Converter
Convert cups, tbsp, tsp, fl oz and ml, grams and ounces, or turn a volume into grams for flour, sugar, butter, milk, oil, honey and water.
Cooking Scale Converter
Scale a whole recipe by servings, or turn cups, spoons or mL of an ingredient into grams, ounces or eggs by King Arthur and USDA weights (1 cup flour = 120 g).
CSV to JSON
Convert CSV to JSON: the first row becomes the keys, quoted commas and line breaks are kept, and numbers and booleans are detected only if you ask.
Deck Board Calculator
Deck boards for a rectangular deck: rows across, pieces per row, linear feet or meters with waste, the ripped last board and an optional joist count.
Density Converter
Convert density in kg/m³, g/cm³, g/L, lb/ft³, lb/in³, lb/gal and ton/yd³: 1 g/cm³ is 1000 kg/m³, 62.428 lb/ft³ and 8.3454 lb per US gallon.
Drywall Panel Calculator
Drywall sheets for a room, its walls, gables and ceiling, laid out horizontally and vertically with 4x8 to 4x16 panels, plus breakage and cost.
Energy Converter
Convert J, kJ, cal, kcal, Wh, kWh, MWh, BTU, therms, ft·lbf, erg and eV either way: 1 kWh = 3.6 MJ = 860.42 kcal = 3412.14 BTU = 0.0341 therm.
Epoch Timestamp Converter
Convert Unix epoch timestamps (seconds or milliseconds) to human-readable date/time and vice versa. Supports UTC, local and named timezones.
Fence Post Spacing Calculator
Fence posts from the length and a maximum spacing: posts = ceil(length ÷ spacing) + 1, spread evenly, with gates, corners, rails, pickets and concrete.
Freight Density Calculator
Freight class from weight and L × W × H in inches, for one item or up to 20 lines: density in pounds per cubic foot (PCF), NMFC class and dimensional weight.
Frequency Converter
Frequency converter for Hz, kHz, MHz, GHz, THz, RPM, BPM, and more, with wavelength, period, musical note, and EM-band readouts.
Gravel Calculator
Gravel for a path, patio or driveway in cubic yards, tons and bags: rectangle, circle, triangle or known area, with bulk and bagged cost compared.
Halogen Wattage Converter
Convert halogen or incandescent bulb wattage to equivalent LED wattage and lumens
Hex to ASCII
Convert hex to ASCII text: 48 65 6C 6C 6F is Hello. Bytes are read as UTF-8, and odd digit counts or bad characters get an error.
Honey Weight to Volume Converter
1 cup of honey weighs 339 g (USDA). Convert honey between cups, tablespoons, teaspoons, mL or fl oz and grams, ounces or pounds, with an editable density.
Horsepower to kW Converter
Convert hp to kW and kW to hp for mechanical, metric (PS), electric and boiler horsepower: 100 hp is 74.57 kW mechanical.
JSON to CSV
Turn JSON into CSV: an array of objects, one object or a list of values. Flatten nested objects, expand arrays into rows, then copy or download.
Kilowatt Hour Calculator
Convert watts and hours of use per day, up to 24, to kWh, then see what an appliance costs to run per day, month and year at your rate.
Mulch Depth Coverage Calculator
Mulch for a bed from its area or shape (rectangle, circle, triangle, border) and depth: cubic yards and bags with 10% extra, and bags against bulk cost.
Paint Calculator
Gallons of paint for a wall area or a room size in feet, less doors and windows, ceiling optional, by texture, coats and waste, with gallons to buy and cost.
Power Converter
Convert mW, W, kW, MW, mechanical, metric (PS) and electric horsepower, BTU/h and refrigeration tons: 1 kW is 1.341 hp, 1 hp is 745.7 W.
Pressure Unit Converter
Convert pressure between Pa, hPa, kPa, MPa, bar, psi, atm, Torr, mmHg, inHg and inH2O. 1 atm = 101,325 Pa = 14.6959 psi = 760 Torr.
Ring Size Converter
Convert ring size between US, EU, UK, Japan and inside diameter in mm. US 7 is EU 54 and 17.3 mm across, UK N½ and Japan 14. With a printable sizer strip.
Roofing Shingle Estimator
Shingles for a roof from the footprint, eaves overhang, pitch and waste: roof area, squares, 3-tab and architectural bundles, cost and gable ridge cap.
Speed Converter
Convert speed between mph, km/h, m/s, knots, ft/s and Mach (343 m/s): 60 mph is 96.56064 km/h, 26.8224 m/s and 88 ft/s.
Temperature Unit Converter
Convert between °C, °F, K, °R and four old scales: Delisle, Newton, Réaumur and Rømer. 0 °C = 32 °F = 273.15 K, and 180 °C is 356 °F.
Tile Calculator
Tile calculator for a floor or wall in grid, diagonal, offset or herringbone, with grout gap and waste: 10 × 10 ft of 12 in tiles is 100, or 110 with waste.
Tire Size Speedometer Error Calculator
Compare two tire sizes, such as 225/45R17 and 245/40R18: diameter change, speedometer error, true speed in mph or km/h and odometer distance.
Torque Converter
Convert torque between N·m, lb·ft, lb·in and kgf·m. 1 N·m = 0.737562 lb·ft = 8.85075 lb·in, and 100 lb·ft = 135.582 N·m.
Unit Converter
Convert length, weight, temperature, area, volume, speed, power, pressure, energy, data, time and force units. 1 mile is exactly 1.609344 km.
Volume Converter
Convert liters, dL and cL, US and Imperial gallons, quarts, pints and fluid ounces, US cups and spoons, and cubic feet. 1 US gallon is 3.785411784 L.
XML to CSV Converter
XML to CSV: each child of the root element becomes a row, its tags become columns and attributes @ columns, with a comma, semicolon, tab or pipe delimiter.