Productivity

UNIT CONVERTER

Convert between 80+ units across 12 categories with batch view, history, and precision control.

Private by design No signup · Free

Common Conversions

History

Frequently Asked Questions

Is my data saved between sessions?

Data is stored locally in your browser using localStorage. Clearing your browser data will remove it. In Unit Converter, entries stay in this browser only.

Can I lose my data?

Since data is stored locally, clearing browser data or using a different device will not carry over your information. In Unit Converter, entries stay in this browser only.

Does this work offline?

Yes. Once loaded, all unit categories convert fully offline in your browser. Convert length, weight, temperature and more anywhere.

Is my data private?

Absolutely. Everything stays in your browser. No data is sent to any server or third party. In Unit Converter, entries stay in this browser only.

How many unit categories are supported?

12 categories: Length, Mass, Volume, Temperature, Area, Speed, Time, Digital Storage, Energy, Pressure, Frequency, and Data Transfer Rate — over 80 units total.

How does the batch view work?

Click 'All Units' to see the converted value in every unit within the current category. Click Copy on any row to copy that specific converted value.

What is the precision slider?

The precision slider controls how many decimal places are shown in the result. Slide from 0 (whole numbers) to 10 (maximum detail).

How does temperature conversion work?

Temperature uses proper formulas (not simple factors). Celsius, Fahrenheit, and Kelvin convert correctly using their respective offset formulas.

Is my data saved between visits?

Yes, your conversion history is saved in your browser's local storage. It persists until you clear browser data or click Clear.

How to Use

Pick a Category

Select from 12 categories using the grid at the top. Each category has its own set of units.

Type a Measurement

Type a number, select From and To units, and see the result instantly. Adjust precision with the slider.

Use Quick Conversions

Click any common conversion button to instantly set up a popular conversion pair.

How to Calculate

Conversions multiply by SI factor tables for length, mass, and volume, while temperature uses offset formulas. Cooking mode switches cups to grams with ingredient density built in.

About the Unit Converter

The Unit Converter is a comprehensive, free online tool for converting between 80+ units across 12 categories. Whether you need to convert length, mass, volume, temperature, or digital storage units, this tool handles it all in your browser.

All processing is done client-side using JavaScript. No data is sent to any server, no sign-up required, and no tracking. The tool works offline after the initial page load and remembers your conversion history between visits.

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Methodology & feedback

Figures run locally in your browser from the values you enter (page updated 2026-10-02). Estimates are educational only — verify finance, tax and health decisions with a qualified professional (see Disclaimer). Spotted an error? Report it via contact and we correct with a new update date.

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