Law of Sines
Calculate Law of Sines instantly with the exact formula and a worked example. Free online calculator — no signup, works on mobile.
Law of Sines
Side a
Angle A°
Angle B°
Side b
8.6603
More about: Law of Sines
What it calculates
The “Law of Sines” calculator computes Side b from 3 parameters: side a, angle a (°), angle b (°).
A core calculation for studying, engineering tasks, and checking solutions.
Example calculation
With parameters Side a = 5, Angle A = 30 °, Angle B = 60 ° the result is 8.66.
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.