Scientific Calculator FR
Free online scientific calculator with trigonometry, logarithms, powers, roots, factorials and the constants pi and e — switch instantly between degrees and radians.
How it works
Tap the keys or type on your keyboard to build an expression. Use the function keys for trigonometry, logarithms, powers and roots, switch between DEG and RAD for angles, and press = to evaluate. Calculations follow standard order of operations.
Frequently asked questions
What can a scientific calculator do?
It handles powers, roots, logarithms, trigonometry, factorials and constants like π and e, as well as the basic four operations.
What is the order of operations?
PEMDAS: parentheses, exponents, multiplication and division left to right, then addition and subtraction. So 2 + 3 × 4 = 14.
What is the difference between log and ln?
log is the base-10 logarithm; ln is the natural logarithm with base e (about 2.718).
Why are my trig answers wrong?
Usually the angle mode. Make sure it is set to degrees or radians to match your problem — sin(90°) = 1.
What does the factorial button do?
It multiplies a whole number by every smaller positive integer. 5! = 5×4×3×2×1 = 120.
How do parentheses help?
They group parts of an expression so they are calculated first, letting you override the default order of operations.
What a scientific calculator does
A scientific calculator goes beyond the four basic operations to handle powers, roots, logarithms, trigonometry and more. This online version evaluates full expressions and respects the standard order of operations, so you can type a calculation the way it is written.
Key functions
Typical functions include exponents and square roots, the trigonometric functions (sin, cos, tan) and their inverses, natural and base-10 logarithms (ln and log), the constants π and e, and factorials. Parentheses let you group parts of an expression to control how it is evaluated.
Order of operations
Calculations follow PEMDAS: parentheses first, then exponents, then multiplication and division (left to right), then addition and subtraction. So 2 + 3 × 4 is 14, not 20, because the multiplication happens before the addition.
For trigonometry, check whether the calculator is set to degrees or radians, since sin(90°) = 1 but sin(90 radians) is something else entirely. Getting the angle mode right is the most common fix when trig answers look wrong.
Results are estimates for general guidance in France and may not reflect the latest local rates, fees or rules. Check official sources before making decisions.