Scientific Calculator Online – Free Advanced Calculator | ERA Tools
Scientific Calculator
Free online calculator for math, trigonometry, powers, and more.
Quick help
Use DEG for degrees or RAD for radians. Type an expression directly or use the buttons. Press Enter to calculate and Escape to clear. Supported functions include sin, cos, tan, asin, acos, atan, sqrt, log (base 10), ln, powers, factorial, and percentage.
Recent calculations
Free Scientific Calculator Online
The ERA Tools Scientific Calculator is a free online calculator for everyday arithmetic and advanced mathematical operations. Use it to solve calculations involving addition, subtraction, multiplication, division, trigonometry, logarithms, square roots, powers, and factorials. It is designed for students, teachers, professionals, and anyone who needs to perform calculations quickly in a web browser.
You do not need to install an app or create an account. Enter an expression using the on-screen keypad or type it into the expression field. The calculator displays the result and lets you review recent calculations.
How to Use This Scientific Calculator
- Enter numbers and operators using the keypad or expression field.
- Use parentheses to group parts of an expression.
- Choose DEG or RAD before calculating trigonometric functions.
- Press the equals button or Enter to calculate.
- Use Ans to insert the previous answer into a new expression.
- Use Copy Result to copy the displayed answer.
Select AC to clear the current expression. DEL removes the last character. The recent-calculations panel keeps a short history during the current page session; selecting a history entry restores its expression.
Scientific Calculator Functions
Basic arithmetic
Perform addition (+), subtraction (−), multiplication (×), and division (÷).
Parentheses help control the order of operations. For example,
(8 + 4) * 3 calculates the sum first and then multiplies it by 3.
Trigonometric functions
The calculator supports sine (sin), cosine (cos), tangent (tan), and their inverse functions (asin, acos, atan). Trigonometric functions depend on angle mode: DEG interprets angles in degrees, while RAD interprets them in radians. Inverse trigonometric functions return an angle in the selected mode.
Logarithms
Use log(x) for the common logarithm, which is base 10, and
ln(x) for the natural logarithm, which is base e. For example,
log(100) is 2, while ln(e) is 1.
Square roots and powers
The square-root button calculates the principal square root of a
non-negative number. Use x² to square a value or xʸ to raise a value
to a power. For example, 5^3 equals 125.
Factorials
A factorial is the product of all positive integers up to a whole number. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120. This calculator accepts factorials for non-negative integers up to 170.
Percentage and constants
The percentage key converts a value to its fractional form: 25% becomes 0.25. The π button inserts pi, approximately 3.14159, and the e button inserts Euler’s number, approximately 2.71828. These constants are useful in geometry, trigonometry, exponential calculations, and other mathematical problems.
Examples You Can Try
12 + 8 * 3— follows arithmetic precedence.sqrt(144)— calculates the square root of 144.log(1000)— returns 3.5!— returns 120.2^8— returns 256.sin(30)in DEG mode — returns 0.5.cos(pi)in RAD mode — returns −1.
Degrees vs. Radians
Degrees and radians are two ways to measure angles. A full circle is 360 degrees or 2π radians. Choose the mode that matches your problem before using sine, cosine, tangent, or their inverse functions. For example, sin(30) is 0.5 in degree mode, while sin(30) in radian mode is a different value.
Who Can Use an Online Scientific Calculator?
- Students: Practice algebra, trigonometry, logarithms, and powers.
- Teachers: Check example calculations and demonstrate functions.
- Professionals: Perform quick numerical calculations while working.
- Everyday users: Solve calculations that require more than a basic calculator.
Calculation Accuracy and Limitations
This tool uses JavaScript's standard floating-point number system. Very large values, extremely small values, and some decimal calculations may be affected by floating-point rounding. Results are displayed with a practical number of significant digits. The calculator is intended for general educational and everyday use, not as a substitute for specialized scientific software in high-precision research or safety-critical work.
Factorials are limited to non-negative whole numbers up to 170. Logarithms require positive inputs, square roots require non-negative inputs, and inverse trigonometric functions accept values within their mathematical domains. Invalid expressions will display an error.
Frequently Asked Questions
1. Is this scientific calculator free?
Yes. You can use the ERA Tools Scientific Calculator online for free without installing software or creating an account.
2. Does it work on mobile phones?
Yes. The calculator is responsive and can be used on supported mobile phones, tablets, laptops, and desktop browsers.
3. What is the difference between DEG and RAD?
DEG measures angles in degrees, while RAD measures angles in radians. Choose the mode that matches your trigonometry problem.
4. What does log mean on this calculator?
log means the common logarithm, or logarithm to base 10. The ln button calculates the natural logarithm, or logarithm to base e.
5. Can I calculate factorials?
Yes. Enter a non-negative whole number followed by the factorial button or exclamation mark. The supported input range is 0 through 170.
6. Can I type expressions instead of clicking buttons?
Yes. You can type supported expressions in the input field. Use standard function names such as sin(30), sqrt(81), and log(100).
7. What does Ans do?
Ans inserts the previous calculated answer into your current expression, allowing you to continue a calculation.
8. Why does the calculator show an error?
An error can occur when an expression is incomplete or invalid, when a function input is outside its mathematical domain, or when a result is not a finite number. Check the expression and angle mode, then try again.
Use the ERA Tools Scientific Calculator
Use the calculator at the top of this page for arithmetic, trigonometry, logarithms, roots, powers, and factorials. Select the appropriate angle mode, enter your expression, and calculate. You can copy the answer or revisit a recent calculation whenever needed.
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