Unit converter tools

Convert between physical units and representations quickly in your browser.

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Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa, with timezone support.
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PX to REM Converter
Convert pixels to rem and rem to pixels instantly. Configurable base font size with a common conversions reference table.
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Unit Converter — Length, Weight, Temperature & More
Convert between units of length, weight, temperature, data, speed, and more. Free, instant, no sign-up.
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Line Height Calculator
Calculate the optimal CSS line-height for any font size. Live preview and copy-ready CSS values.
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Typography Size Converter — PX, PT, EM, %
Convert between px, pt, em, rem, and percent for CSS typography. Enter any value and see all units instantly.
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Shoe Size Converter
Convert shoe, sneaker, and tennis shoe sizes between US, UK, EU, Brazil, Japan, Mexico, Australia, and cm. Men, women, and kids — instant and free.
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Paper Sizes Reference
Complete reference for paper sizes — A series, US Letter, Legal, Tabloid, and more. Search and filter by name or dimensions.
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Time Zone Converter
Convert date and time between time zones instantly. Compare multiple zones side by side.
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Area Converter — Square Feet, Square Meters, Acres & Hectares
Convert square feet to square meters, acres to hectares, and every common area unit instantly. Free area converter that runs in your browser.
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Volume Converter — Liters, Gallons, Cups & More
Convert liters to gallons, cups to milliliters, and every common volume unit instantly. Free volume converter that runs entirely in your browser.
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Pressure Converter — PSI, Bar, kPa & Atm
Convert psi to bar, kPa to psi, atmospheres, torr, and mmHg instantly with NIST conversion factors. Free pressure converter, runs in your browser.
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Energy Converter — Joules, Calories, kWh & BTU
Convert joules to calories, kWh to BTU, electronvolts, and foot-pounds instantly with NIST factors. Free energy converter, runs in your browser.
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Power Converter — HP to kW, Watts & BTU/h
Convert horsepower to kilowatts, watts to BTU/h, and tons of refrigeration instantly with NIST factors. Free power converter in your browser.
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Force Converter — Newtons, Kilograms-Force & Pounds-Force
Convert newtons to pounds-force, kilograms-force, dynes, and poundals instantly with exact NIST factors. Free force converter in your browser.
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Torque Converter — Nm to Ft-Lb
Convert newton-meters to foot-pounds, inch-pounds, and kgf·m instantly with exact NIST factors. Free torque unit converter in your browser.
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Acceleration Converter — m/s², G-Force & More
Convert m/s² to g-force, ft/s², Gal, and km/h per second instantly with exact NIST factors. Free acceleration unit converter in your browser.
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Density Converter — kg/m³, g/cm³ & lb/ft³
Convert kg/m³ to g/cm³, lb/ft³, lb/in³, and kg/L instantly with exact NIST-derived factors. Free density unit converter in your browser.
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Angle Converter — Degrees, Radians & Gradians
Convert degrees to radians, gradians, arcminutes, arcseconds, and turns instantly. Free angle unit converter that runs entirely in your browser.
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Frequency Converter — Hz, kHz, MHz & RPM
Convert hertz to kilohertz, megahertz, RPM, and radians per second instantly. Free frequency unit converter that runs entirely in your browser.
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Bandwidth Converter — Mbps, MB/s & Gbps
Convert Mbps to MB/s, Gbps to Mbps, and MiB/s instantly — decimal and binary prefixes handled correctly. Free bandwidth converter in your browser.
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MPG to L/100km Converter — Fuel Economy
Convert fuel economy between US MPG, UK MPG, L/100km, and km/L instantly. Free fuel consumption converter that runs entirely in your browser.
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Wind Speed Converter — Knots, MPH, km/h & Beaufort Scale
Convert wind speed between knots, mph, km/h, and m/s and read the Beaufort scale force with description. Free wind converter in your browser.
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