Conversion Tools
Professional conversion calculators built by experts for accurate measurements across units, currencies, and formats. Our conversion tools use industry-standard formulas and are regularly updated to ensure precision for professionals, students, and everyday users.
Conversion Tools
Ancient Biblical Unit Converter: Cubits & Feet
This ancient biblical unit converter changes cubits, spans, and reeds into modern meters, feet, and miles, using values based on archaeological evidence.
Angle Unit Converter: Degrees, Radians, Gradians, Turns
Convert an angle between degrees, radians, gradians (gon) and turns, all four at once. One turn is exactly 360 degrees and 400 gon, and it is 2π radians.
Base64 Image Decoder | Decode & Preview Images Online
Free online base64 image decoder tool. Instantly decode and preview base64 strings as JPEG, PNG, GIF, WebP, or SVG images. Works with data URLs and raw base64.
BC to AD Year Converter - Historical Date Calculator
Convert BC and AD years to astronomical year numbers and find the exact span between two historical dates, with automatic correction for the missing year zero.
Bidirectional Base Converter - Decimal, Hex, Base32, Base64
Convert numbers between decimal and Base16 (hexadecimal), Base32, or Base64 in either direction. RFC 4648 encodings, with a hint naming a pasted value's base.
Binary to Decimal Converter | Free Online Tool
Convert binary to decimal or decimal to binary instantly online. See the exact formula, worked examples, and a step-by-step breakdown for each conversion.
Bit and Byte Length Calculator
Calculate the bit and byte length of an integer, hexadecimal string, or text string, with formulas for UTF-8, UTF-16, UTF-32, ASCII, and Latin-1 encoding.
Board Foot Calculator - Lumber Volume Calculator
Calculate board feet from lumber thickness, width, and length in inches. Free calculator with the board foot formula, a worked example, and a size chart.
CCF to Gallons Converter (Water Bill Calculator)
Convert CCF (hundred cubic feet) to gallons. One CCF is 172,800 / 231, or about 748.052 gallons. See the formula, worked examples, and a conversion chart.
Concentration to Molarity Converter | w/v % to mol/L
Convert weight per volume (w/v) percentage concentration to molarity by entering the percentage concentration and molecular weight of a substance, in mol/L.
Cubic Yards to Tons Converter | Material Weight
Convert cubic yards to tons for soil, gravel, concrete, sand, and asphalt using standard material densities, with formulas, a density chart, and examples.
Currency Converter: ECB Daily Reference Rates
Convert between USD, EUR, GBP, JPY and six more at the European Central Bank's daily reference rate, with the date the rate was published for.
Decagram to Gram Converter | Instant dag to g Conversion
Convert decagrams to grams or grams to decagrams instantly. 1 decagram (dag) equals exactly 10 grams. Includes the formula, worked examples, and an FAQ.
Decimal Pounds to Ounces Converter
Converts decimal pounds to ounces by multiplying by 16, and shows the same weight in pounds and ounces. For example, 2.5 lb equals 40 oz, or 2 lb 8 oz.
Decimeter to Meter Conversion Calculator: Convert dm to m
Convert decimeters to meters or meters to decimeters with this free calculator. Includes the conversion formula, worked examples, and a reference table.
Drops to Milliliters (mL) Converter
Convert drops to milliliters or milliliters to drops using the standard medical formula of 20 drops per mL, with worked examples and a quick reference table.
Energy Converter: Joules, kWh, Calories and BTU
Convert energy between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours and BTU, using exact defined factors.
Feet to Inches Converter: Easy Measurement Conversion Tool
Convert feet to inches or inches to feet using the exact ratio of 12 inches per foot. Includes the conversion formula, worked examples and a feet-inches table.
Grain Conversion Calculator: Bushels to Pounds to Kilograms
Convert bushels, pounds, and kilograms for wheat, corn, soybeans, and five other grains using USDA-standard bushel weights. A free tool for farmers and traders.
Grams to Moles Converter | Free Chemistry Calculator
Convert grams to moles or moles to grams using molar mass. Enter the amount and the molar mass in g/mol to get the result, formula and worked example.
Height Converter to Inches: Feet, Meters, cm
Convert height to inches from feet and inches, meters, or centimeters. See the exact formula and worked result, based on the standard 1 inch = 2.54 cm ratio.
Inch to Fraction Converter - Decimal to Fraction Calculator
Converts decimal inches to fractions rounded to the nearest 1/64 inch, matching standard ruler and tape-measure markings such as 1/8, 1/16, and 1/32 inch.
land-area-conversion-calculator
Convert land area between ares and hectares. 1 hectare = 100 ares. Includes the formula, worked examples, and an ares-to-hectares conversion table.
Length Converter: Meters, Feet, Inches, Miles & More
A length converter for meters, kilometers, centimeters, millimeters, inches, feet, yards, and miles, with exact results and a visual bar chart comparison.
Light-Year Distance Converter | km, Miles & AU
Convert light-years to kilometers, miles, and astronomical units (AU) instantly, or reverse. Uses the exact IAU light-year definition with a worked example.
Mayan Calendar Converter | Long Count to Gregorian
Convert dates between the Mayan Long Count calendar and the Gregorian calendar. Learn the conversion formula, the GMT correlation constant, and worked examples.
Mesh to Micron Converter - Free Screen Size Calculator
Convert mesh size to microns and microns to mesh using the ASTM E11 sieve size table. A free calculator for filtration, sieve analysis, and particle sizing.
Military Time Converter: 24-Hour to 12-Hour Clock
Convert military time to standard time and back. Reads 2330, 23:30 and 11:30 PM, and explains 0000 and 2400 midnight, noon, 12 AM and 12 PM.
Number Base Converter: Binary, Hex, Decimal & Octal
A number base converter changes numbers between binary, decimal, octal, hexadecimal, or any base from 2 to 36. It shows the exact conversion as you type.
Pixel to Inch Converter | Convert Pixels to Inches
Convert pixels to inches with this free calculator. It applies the formula inches = pixels divided by DPI and lists common DPI values for screens and printing.
Pounds to Kilograms Converter (lbs to kg)
Convert pounds to kilograms using the exact factor of 0.45359237. This calculator converts body weight, luggage, and shipment weights between lb and kg.
Power Converter: Watts, kW, hp and Metric PS
Convert power between watts, kilowatts, mechanical horsepower and metric PS. 1 hp is exactly 745.69987 W and 1 PS is 735.49875 W, about 1.4% apart.
PPM to Molarity Calculator
Convert parts per million (PPM) to molarity in moles per liter. Enter a PPM value and molar mass to get molarity, plus the formula and a worked example.
Pressure Unit Converter: Pa, kPa, bar, atm and psi
Convert pressure between pascals, kilopascals, bars, atmospheres and psi. 1 bar = 100,000 Pa and 1 atm = 101,325 Pa, both exact by definition.
PX, REM, and EM Unit Converter
A px to rem and em converter for CSS. Enter a pixel, rem, or em value to see its equivalent in the other two units, using custom root and parent font sizes.
Recipe Measurement Converter: Volume, Weight, Temperature
Convert cooking measurements: cups, tablespoons, liters for volume; grams, pounds for weight; Fahrenheit, Celsius, Kelvin for temperature, using exact formulas.
Shoe Size Converter - Convert US, UK, EU & Asian Sizes
Convert shoe sizes between US, UK, EU, and Asian systems instantly. Accurate conversions for men's, women's, and kids' footwear with comprehensive size charts.
Shoe Size Converter - Instant US, UK, EU & JP Conversion
Convert shoe sizes between US, UK, EU & JP instantly. Includes comprehensive charts for men, women & kids. Get accurate conversions for international shopping.
Speed Unit Converter: m/s, km/h, mph, ft/s, knots
Convert speed between metres per second, km/h, mph, feet per second and knots. 1 mph is exactly 0.44704 m/s and 1 knot is 1.852 km/h.
Square Feet to Cubic Yards Calculator - Free Converter
Convert square feet to cubic yards for concrete, mulch, gravel, and topsoil. Free calculator with depth input. Get accurate material estimates instantly.
Square Yard Calculator - Convert Feet and Meters
Calculate area in square yards from feet or meters using the standard conversion formula, with a worked example for flooring and landscaping projects.
Square Yards Calculator: Feet and Inches to Sq Yards
Convert length and width in feet or inches into square yards. Find the formula, worked examples, and common uses for carpet, flooring, and landscaping.
Stone Weight Calculator by Dimensions & Type
Find stone weight from dimensions and stone type. Enter length, width, and height for granite, marble, limestone, and five more, then get results in kg or lbs.
Temperature Converter: Celsius, Fahrenheit, Kelvin
Convert a temperature between Celsius, Fahrenheit, Kelvin and Rankine. Shows all four scales at once and refuses any reading below absolute zero.
Text to Morse Code Converter - Free Online Translator Tool
Convert text into International Morse Code with dots and dashes. Supports letters, numbers, and punctuation, and includes a full Morse code reference chart.
Time Interval Calculator - Calculate Time Between Dates
Find the exact time between two dates and times, in seconds, minutes, hours, and days, with a plain-language summary. Accounts for leap years and DST changes.
Time Unit Converter | Years Days Hours Minutes Seconds
Convert time between years, days, hours, minutes, and seconds. Explains the 365.2425-day-year formula, gives worked examples, and answers common questions.
Torque Converter: N·m, lbf·ft and kgf·m
Convert torque between newton metres, pound-force feet and kilogram-force metres. 1 lbf·ft is exactly 1.3558179483314004 N·m and 1 kgf·m is 9.80665 N·m.
Unix Timestamp to Date Converter (12-Hour or 24-Hour)
Converts a Unix timestamp to a calendar date and time. Detects second, millisecond and microsecond precision, and shows the result in 12-hour or 24-hour format.
Volume to Area Calculator: Gallons Per Square Foot
This calculator divides gallons by square feet to find liquid coverage rate, for paint, sealer, epoxy, or fertilizer, and compares it with product label rates.