Does anything get uploaded?

No. Every calculation runs locally in your browser — nothing is sent to a server.

How is temperature handled?

Celsius, Fahrenheit, Kelvin, and Rankine are converted through Celsius using the exact offset formulas rather than a simple multiplier.

What's the difference between KB and KiB?

KB is decimal (1,000 bytes), KiB is binary (1,024 bytes). Both are listed separately so you can pick the one your context uses.

Can I use this on mobile?

Yes. It's a lightweight page with no dependencies, so it works on any modern browser on phone, tablet, or desktop.

Convert units

Free online unit converter for length, weight, temperature, volume, area, speed, time, data, pressure, and energy — instant and 100% in your browser.

What people use it for

Convert inches to centimeters for furniture and shipping dimensions.
Switch a recipe between cups, milliliters, and grams.
Convert Fahrenheit to Celsius for weather or oven temperatures.
Convert miles per hour to kilometers per hour when driving abroad.
Translate pounds to kilograms for gym plates or luggage limits.
Convert MB to MiB or GB to GiB when sizing disks and backups.

This free online unit converter handles the everyday conversions people actually search for — inches to cm, cm to inches, lbs to kg, kg to lbs, Fahrenheit to Celsius, miles to km, ml to oz, and dozens more — all instantly and without an app, signup, or ad wall.

It covers length, weight, temperature, volume, area, speed, time, digital storage, angle, pressure, energy, and power, with both metric and US/imperial units side by side. Every factor uses the exact internationally defined constant, so results match what you'd get from a scientific calculator or spec sheet rather than a rounded estimate.

Because everything runs locally in your browser, you can use it as a quick metric to imperial converter, a cooking measurement converter, or a unit conversion calculator for engineering or schoolwork without anything being uploaded or logged.

How it works

1
Pick a category
Choose length, weight, temperature, volume, or one of the other categories.
2
Type a value and pick units
Enter a number on the left, pick the unit you have and the unit you want.
3
See every equivalent
The result updates as you type, and every other unit in the category is listed below for quick reference.

Frequently asked questions

Yes. All factors use the internationally defined SI and imperial conversion constants (e.g. 1 inch = 0.0254 m exactly, 1 lb = 0.45359237 kg exactly).

Want this converter on your website?

Pro members can embed any Minitooler converter on their own site — styled to match, with no branding beyond a small credit link. One iframe, unlimited use, still 100% in the browser.

Unlock embeds — $5/mo

Accent color

Theme

Background

Text color

Width

Height

Embeds are a Pro feature

Upgrade to unlock a customizable iframe snippet you can paste into any website — colors, theme, and size all tuned to match your brand.

Go Pro — $5/mo

What people use it for

How it works

Pick a category

Type a value and pick units

See every equivalent