Scientific Calculator
Use this free scientific calculator online for trigonometry, logarithms, square roots, exponents and factorials.
What Is a Scientific Calculator?
A scientific calculator goes beyond basic arithmetic. It handles trigonometry, logarithms, powers, roots and factorials, which makes it essential for algebra, geometry, physics, chemistry and engineering. This free online scientific calculator runs in your browser, so you can use it on a phone, tablet or computer with nothing to install.
How to Use This Online Scientific Calculator
Type an expression in the box or tap the keypad buttons, and the answer appears instantly. Use parentheses to group parts of a calculation. Choose degrees or radians before using trigonometric functions. Examples: sin(30) gives 0.5 in degree mode, 2^10 gives 1,024, sqrt(144) gives 12, log(1000) gives 3 and 5! gives 120.
Functions Included
- Trigonometry: sin, cos, tan and their inverses asin, acos and atan.
- Logarithms: log is base 10 and ln is the natural logarithm.
- Powers and roots: use ^ for exponents and sqrt for square roots.
- Other tools: abs, exp, factorial (!), percent (%) and the constants pi and e.
Order of Operations
The calculator follows the standard order of operations: parentheses first, then exponents, then multiplication and division, then addition and subtraction. For example, 2+3*4 equals 14, not 20. Adding parentheses, as in (2+3)*4, changes the result to 20.
Degrees vs. Radians
Angles can be measured in degrees (a full circle is 360) or radians (a full circle is 2 x pi). Most geometry classes use degrees, while calculus and physics often use radians. If sin(90) does not return 1, check that you are in degree mode.
Who Uses a Scientific Calculator?
Students use it for homework in algebra, trigonometry and chemistry. Engineers and technicians use it for quick checks, and DIY builders use it for angles and measurements. Always check the rules of your school or test before relying on any online tool.
Frequently Asked Questions
What is the difference between log and ln?
Log uses base 10, while ln uses base e, roughly 2.718.
How do I calculate a percentage?
Type a number followed by %, such as 20%*150, which gives 30.
Why do I get a math error?
Errors happen with undefined operations such as dividing by zero or taking the square root of a negative number.
Type an expression or use the keypad. Results are rounded to 12 significant digits.