Trig identity check
sin(30) + cos(60)1
Scientific Calculator
Use this free scientific calculator for typed expressions, trigonometry, inverse trig, logarithms, square roots, cube roots, powers, constants, DEG/RAD mode, expression history, and quick result copying.
Keyboard supportDEG / RAD modeExpression historyCopy results
DEG mode
History
Recent expressions stay in this page while you work.
Your recent expressions will appear here.
How to use the Scientific Calculator
- Choose DEG or RAD before using trig or inverse trig functions.
- Type an expression or use the keypad, such as sin(30)+cos(60), (3+5)^2, or 1.2e3+4.5e2.
- Use functions such as sin, cos, tan, asin, acos, atan, log, ln, sqrt, cbrt, abs, powers, pi, and e.
- Press equals or Enter, then check the answer against the selected angle mode.
- Copy the result or reuse a recent expression from the page-session history while you compare answers.
What people use it for
Solve trigonometry problems in degrees or radians before copying the result.
Check inverse trig answers such as asin(0.5) and read them in the selected angle mode.
Calculate logarithms, natural logs, square roots, cube roots, powers, and absolute values.
Type full expressions with parentheses, pi, e, and scientific notation such as 1.2e3.
Compare homework, science, engineering, and quick study expressions in one browser tab.
Reuse recent expressions from the history panel while testing small formula changes.
Quick examples
Radians with pi
sin(pi/6) + cos(pi/3) in RAD mode1
Inverse trig in degrees
asin(0.5) in DEG mode30
Logs and powers together
log(1000) + ln(e) + 2^536
Roots and absolute value
sqrt(25) + cbrt(8) + abs(-4)11
Scientific notation input
1.2e3 + 4.5e21650
Parentheses and powers
(3 + 5)^2 / 416
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Scientific CalculatorSee slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- CalculatorsBrowse related calculators and utilities in the same category.
- Calculator and utility guidesFind more guides that use real tool inputs and example numbers.
- All free toolsSearch every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Quick answers about angle mode, supported functions, typing expressions, and privacy.
What is the difference between DEG and RAD?
DEG uses degrees for trigonometry, so sin(30) means 30 degrees. RAD uses radians, which is common in advanced math and many science classes.
Which functions are supported?
The calculator supports sin, cos, tan, inverse trig functions, log, ln, sqrt, cbrt, abs, powers, parentheses, pi, e, scientific notation, and standard arithmetic.
What do the main Scientific Calculator inputs mean?
The main inputs are the numbers, operation, mode, or known values the calculator needs. Keep units consistent, enter percentages the way the page label shows, and use the examples as a quick check before trusting the answer.
How should I read the Scientific Calculator answer?
Read the headline answer, then check the supporting lines and examples to understand how the calculator got there. If one input changes, rerun the tool and compare the new answer instead of guessing.
Can I type expressions directly?
Yes. You can click the keypad or type expressions such as sin(45)+log(100), (3+5)^2, or 1.2e3+4.5e2. Press Enter or the equals button to calculate.
How do inverse trig functions work?
Use asin, acos, and atan for inverse trig. In DEG mode, asin(0.5) returns 30. In RAD mode, the same inverse trig answer is shown in radians. The input for asin and acos must be between -1 and 1.
How do I enter powers and scientific notation?
Use ^ for powers, such as 2^5. Use e notation for powers of 10, such as 1e3 for 1000 or 2.5e-4 for 0.00025. Type pi or e by itself when you want the constants.
Why did the calculator show Error?
Error usually means the expression has mismatched parentheses, a missing value, division by zero, a square root of a negative number, a log of zero or a negative number, or an inverse trig input outside its valid range.
Does the history leave my browser?
No. Recent scientific calculations stay in the page session only and are not sent to a server.
What is this Scientific Calculator best for?
Use it when you need trig functions, logs, roots, powers, constants, parentheses, or DEG/RAD angle mode. For plain totals and quick percentages, the Basic Calculator is simpler.
Does this replace a graphing calculator or algebra system?
No. This page evaluates numeric expressions. It does not graph functions, solve symbolic algebra, keep exact radicals, or show a full step-by-step derivation. Use it as a fast check, then use a graphing or class-approved tool when the assignment asks for that.
What should I check before trusting a scientific result?
Check parentheses, angle mode, negative signs, exponent grouping, and whether your class or formula expects degrees or radians. A correct expression in the wrong mode can still give the wrong answer.
Are the results exact?
The calculator uses browser number math and rounds long decimals for readability. For exact huge integer arithmetic, use the Big Number Calculator. For exact fraction work, use the Fraction Calculator.