Converter calculators
19 calculators
Dedicated converter pages scale a quantity through a shared base unit—area, acreage from width and length, length families, numeral bases, and similar conversions.
Factors follow conventional SI and customary constants. For a multi-family hub in one UI, use the Unit Converter; family pages stay focused on one dimension. Converters are instant and need no login.
Length and area calculators
Length, area, and acreage from dimensions.
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Acreage Calculator
Find land area from width and length, then convert acres, hectares, square meters, square feet, and square miles. Optional price per unit gives a total cost.
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Area Converter
Convert between square meters, acres, hectares, square feet, square yards, and square miles. Use it for hectares to acres, acres to square meters, or any pair of area units in the list.
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Length Converter
Convert meters, kilometers, miles, feet, inches, and more.
Mass, volume, and temperature calculators
Weight, volume, and temperature families.
Energy, force, and motion calculators
Energy, power, force, pressure, velocity, and fuel economy.
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Energy Converter
Convert joules, calories, watt-hours, BTU, and electronvolts.
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Force Converter
Convert newtons, kilogram-force, pound-force, and dynes.
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Fuel Economy Converter
MPG ↔ L/100km (mode 0=mpg→L/100km, 1=reverse).
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Power Converter
Convert watts, kilowatts, horsepower, and BTU per hour.
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Pressure Converter
Convert pascals, bars, atmospheres, psi, and torr.
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Velocity Converter
Convert speed between m/s, km/h, mph, knots, and ft/s.
Digital and other calculators
Data sizes, bases, numerals, angles, and time units.
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Angle Converter
Degrees, radians, and gradians (mode 0–3).
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Base Converter
Convert integers between binary, octal, decimal, and hexadecimal.
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Data Storage Converter
Convert among B, KB, MB, GB, TB (binary).
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Download Speed Converter
Convert download/transfer rates between bit and byte based units.
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Megabytes Converter
Convert data sizes between bits, bytes, KB/MB/GB (decimal SI) and KiB/MiB/GiB.
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Roman Numerals Converter
Convert between Arabic numbers (1–3999) and Roman numerals.
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Time Converter
Convert seconds, minutes, hours, days, weeks, and years.