100% local processing — your files and data never leave this browser. No uploads, no server storage.

OnboxTools

Unit Converters

Certified Utility Suite

Access our specialized collection of unit converters. Built for security and performance, these tools process all data locally.

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Area Converter

Acres, hectares, sq ft, km² — plus bigha, guntha, marla, kanal.

Launch Area Converter
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Color Format

HEX ↔ RGB ↔ HSL ↔ CMYK with live preview.

Launch Color Format
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Data Storage & Transfer

KB vs KiB, MB vs MiB, Mbps vs MB/s.

Launch Data Storage & Transfer

Fuel & Gas Converter

Diesel kg ↔ liter, oil, mpg ↔ L/100 km — plus CNG guide.

Launch Fuel & Gas Converter
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Kitchen & Cooking

Tablespoons, teaspoons, ml, cups — plus grams by ingredient.

Launch Kitchen & Cooking
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Length & Distance

Meters, feet, miles, km, inches, nautical miles.

Launch Length & Distance
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Number Base

Binary, octal, decimal, hexadecimal — BigInt support.

Launch Number Base
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Paper Size

A4 ↔ Letter ↔ Legal — mm, inches, pixels at any DPI.

Launch Paper Size
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Speed

km/h, mph, m/s, knots, Mach.

Launch Speed
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Temperature

Celsius, Fahrenheit, Kelvin, Rankine.

Launch Temperature
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Typography Converter

px ↔ pt ↔ rem ↔ em — CSS units for developers.

Launch Typography Converter
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Volume

Liters, gallons, cups, bushels — liquid and dry.

Launch Volume
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Weight & Mass

Kg, lbs, oz, troy ounces, stones, tons.

Launch Weight & Mass

Unit Conversion and Measurement Standards

Accurate unit conversion requires precise conversion factors anchored to international standards (SI, NIST, ISO paper sizes). Our converter suite normalizes all values through SI base units — meters for length, kilograms for mass, liters for volume, pascals for pressure — ensuring consistent results across regional variants like bigha (state-specific), US vs UK gallons, and decimal vs binary data prefixes. Each tool runs entirely in-browser using JavaScript floating-point and BigInt arithmetic. No values are transmitted to servers, making these tools suitable for property records, engineering calculations, recipe scaling, and developer typography workflows. Regional land units include labeled variants (UP, Gujarat, Bengal bigha) to reduce ambiguity common on competitor pages with single-factor approximations.

Unit Converters FAQ

Are conversion factors accurate?

Yes. We use NIST/SI standard factors (e.g. 1 lb = 0.45359237 kg exact, 1 inch = 25.4 mm exact).

Why does bigha vary by region?

Bigha is a traditional unit without one national standard. Our tool offers state-specific variants labeled clearly.

MB vs MiB — which should I use?

Hard drive labels use decimal MB/GB. Operating systems often show binary MiB/GiB. Our data converter supports both.

Is data uploaded during conversion?

No. All math executes locally in your browser — safe for property measurements and proprietary engineering values.