Scientific Calculator
Angles in degrees; add ° to force degrees. Type with your keyboard too: Enter for =, Esc to clear. Multiplication and division come before addition and subtraction.
History
Calculations appear here; click one to reuse it.
A scientific calculator for trigonometry, logarithms, powers, roots and factorials. Type a full expression or use the keys, switch between degrees and radians, and see the result as you type; earlier answers stay in the history and the Ans key reuses the last one.
Formula
Worked Example
sin 30° = 0.5, log 1000 = 3 because log is base 10 and 10³ = 1000, and 2⁴ = 16. Functions and powers are evaluated before the additions.
Frequently Asked Questions
Should I use degrees or radians?
Use degrees for angles measured with a protractor or written with a ° sign, and radians in calculus and physics formulas where angles come as multiples of π. The DEG/RAD key switches the mode; typing ° after a number, as in sin(30°), always means degrees.
Is log base 10 or base e?
log is base 10 (log 1000 = 3) and ln is the natural logarithm, base e ≈ 2.71828 (ln e = 1). For any other base use the change-of-base rule: log₂ 8 = ln 8 ÷ ln 2 = 3.
Why is −2² equal to −4?
Powers are evaluated before the minus sign, so −2² means −(2²) = −4, as in algebra and on most scientific calculators. Write (−2)² to square negative two and get 4.
Common Mistakes
- !Taking sin, cos or tan of an angle in degrees while in radian mode: sin(30) in radians is −0.988, not 0.5.
- !Typing 1/2π and expecting 1/(2π) = 0.159. It is read as (1/2) × π = 1.571; add parentheses around the denominator.