Triangle Calculator
Solve any triangle — enter three known values (sides and/or angles) and calculate all remaining sides, angles, area, and perimeter.
Three sides known
Results
Scalene RightSide a
3
Angle A
36.870°
Side b
4
Angle B
53.130°
Side c
5
Angle C
90.000°
Area
6 units²
Perimeter
12.000 units
- 100% free — no account needed
- Runs in your browser
- Nothing is uploaded
Frequently asked questions
Is Triangle Calculator really free?
Yes. Triangle Calculator is completely free on PureBrowser — every feature, with no account, no trial, and no credit card.
Does Triangle Calculator upload my data?
No. Triangle Calculator runs entirely inside your browser, so anything you type, paste, or open stays on your own device.
Do I need to sign up or install anything?
Neither. There is no account and nothing to download — open the page and Triangle Calculator is ready to use on desktop or mobile.
Does Triangle Calculator work offline?
Once the page has loaded, yes. All of the processing happens locally in your browser, so it keeps working without a connection.
More utility tools
Password Strength Checker
Score your password strength and generate stronger ones.
Password Generator
Generate strong random passwords with configurable length and character sets.
Decision Maker
Let the tool randomly pick from your list of options.
Yes or No Wheel
Spin a wheel for a random yes or no answer.
Discord Timestamp Generator
Pick a date and time to generate Discord timestamp tags with live preview and one-click copy.
Discord Embed Builder
Design Discord embeds with live preview — copy JSON for bots, webhooks, and Discord.js.