° to rad as you type
The result updates instantly using the exact defined factor, where 1 ° = 0.017453 rad. No page reloads and no rounding surprises.
CalculatorsRuns in your browser
Degrees to Radians Converter
Convert degree to radian instantly, in your browser.
- Input
- No upload needed — instant
- Privacy
- Nothing is uploaded
- Cost
- Free · no sign-up · no watermark
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Processed entirely on your device
Everything you type or paste is handled by JavaScript running in this tab. No request is sent, nothing is logged and nothing is stored. Close the page and it is gone.
Overview
About the Degrees to Radians Converter
Turn Degree into Radian with an exact factor. Type a value and get rad, every other angle unit, and the working — all locally, with nothing uploaded.
Degree and Radian describe the same quantity on two different scales, and converting between them is a single arithmetic step once you know the exact factor. This page does that step in your browser: type a value in ° and the rad result appears immediately, alongside the same figure in every other angle unit.
The conversion
One ° is exactly 0.017453 rad:
rad = ° × 0.017453
° = rad × 57.2958Multiply to go one way, divide (or multiply by the inverse) to come back. The factor is a defined constant, not a measurement, so it never needs rounding.
Worked example
10 ° = 0.174533 rad. Enter 10 in the box above and you will see exactly that, plus the value carried across the rest of the angle scale so you can sanity-check it against a unit you already recognise.
About these units
Angle conversions turn on π. A full turn is 360 degrees and 2π radians, so one radian is exactly 180⁄π degrees — an irrational number, which is why radian results are shown to a fixed number of decimals rather than exactly.
Converting the other way
Press Swap to turn this into a rad-to-° converter in place. The inverse factor, 1 rad = 57.2958 °, is shown in the arithmetic panel so you can check the reverse calculation independently.
Step by step
How to use the Degrees to Radians Converter
Enter the value in ° (degree) that you want to convert.
Read the answer in rad, which updates the moment you type.
Scan the full angle table to see the same value in every other unit at once.
Copy the result, or press Swap to convert back the other way without re-entering anything.
Why use it
Benefits and common use cases
What this tool is good for, and what it deliberately does not try to do.
Exact, defined factors
Every angle conversion here uses the internationally defined relationship between ° and rad, so the answer is as precise as the standard that fixes it rather than an approximation.
The whole category at once
Alongside the rad answer you get the same value expressed in every angle unit, so you can find the one you actually need without converting twice.
Private by construction
The arithmetic runs in your browser's own JavaScript. The numbers you enter are never sent to a server — close the tab and they are gone.
Questions
Frequently asked questions
Short, honest answers about quality, limits and privacy.
How many radian are in one degree?
One ° equals 0.017453 rad. Multiply any ° value by 0.017453 to get rad — for example, 10 ° = 0.174533 rad.
What is the formula to convert ° to rad?
rad = ° × 0.017453. The page does this multiplication for you and also lists the inverse, 1 rad = 57.2958 °.
Is this angle converter accurate?
Yes. It uses the exact defined factor for ° and rad and full double-precision arithmetic. The only rounding is in how many decimals are shown, which you control with the precision menu.
Are my numbers uploaded to a server?
No. The conversion runs entirely in your browser, so nothing you type leaves your device. There is no account, no logging and no network request of any kind.