Scientific Calculator Online
A free online scientific calculator with Degree / Radian modes — trigonometry, inverse trig, logarithms, powers, roots, factorials and constants — built on a real order-of-operations engine so your answers follow correct math precedence.
Tip: click the calculator and type with your keyboard too (Enter = , Esc = AC).
What Is a Scientific Calculator?
A scientific calculator handles the higher-level math used in school, college and entrance exams — trigonometry, logarithms, exponents, roots and factorials — far beyond a basic four-function calculator. This online scientific calculator runs entirely in your browser, works on mobile and desktop, and needs no app or install.
- sin, cos, tan + inverse (sin⁻¹, cos⁻¹, tan⁻¹)
- log (base 10) and ln (base e)
- Constants π (Pi) and e (Euler's number)
- Powers xʸ, reciprocal x⁻¹ and roots √
- Factorials n! for permutations
- Brackets with true order of operations
Degree vs Radian — The #1 Cause of Wrong Trig Answers
Most "my sin/cos is wrong" problems are just the wrong angle mode. Tap the DEG / RAD badge on the calculator to switch.
School geometry / trig, angles with a ° symbol.
sin(30) = 0.5cos(60) = 0.5Calculus and π-based angles.
sin(π/6) = 0.5tan(π/4) = 1💡 Quick check: if sin(90) gives 1, you're in DEG mode.
How to Use It (Quick Guide)
Trig answers depend entirely on this. Tap the badge to toggle.
sin(30+60) is not the same as sin(30)+60 — brackets force the right order.
log is base 10, ln is base e. Mixing them is the most common exponent mistake.
Keep full precision through the steps, round the final answer.
Frequently Asked Questions
Why is my scientific calculator giving wrong sin, cos or tan answers?
Almost always the wrong angle mode. Degree questions need DEG, and π-based or calculus questions need RAD. Quick check: if sin(90) gives 1 you're in Degree mode; if it gives ≈0.894 you're in Radian mode.
Should I use degrees or radians if the question doesn't say?
Degree symbol or school geometry/trig → degrees. Value uses π or comes from calculus → radians. When unsure, try both and see which answer fits the expected range.
What is the difference between log and ln?
log is base 10, so log(100) = 2. ln is base e, so ln(e) = 1. Using one where the other is needed is a very common mistake in exponential problems.
How do I type powers like 2 to the power 3?
Press xʸ (the ^ key). Type 2, then ^, then 3, then =, to get 8. For reciprocals like 5⁻¹, use the x⁻¹ key which inserts ^(-1).
Why does adding brackets change my answer?
The engine follows BODMAS order of operations. Brackets force your intended grouping — sin(30+60) differs from sin(30)+60 — and prevent mistakes in longer expressions.
Is an online scientific calculator accurate for exam practice?
Yes for standard functions. Accuracy depends on correct input, the right angle mode, and balanced brackets. This tool uses a proper order-of-operations engine, not a simple left-to-right evaluation.
What does "Error" mean on the calculator?
Invalid operations — dividing by zero, √ of a negative, sin⁻¹/cos⁻¹ of a value outside −1 to 1, factorial of a negative or non-whole number, or mismatched brackets. Recheck your input and brackets.