Quick answer
Use DEG mode for degree angles like 30, 45, and 90. Use RAD mode when the problem gives radians or uses pi, such as sin(pi/6). Then type the whole expression, check parentheses, and read the result as a numeric estimate. For example, asin(0.5) in DEG mode returns 30, while 1.2e3 + 4.5e2 returns 1650.
Quick start
- Type an expression directly or build it with the scientific keypad.
- Choose DEG or RAD before using sin, cos, tan, or inverse trig functions.
- Use parentheses when you need to control the order of operations.
- Press equals or Enter to calculate the expression.
- Use history to reload recent expressions or Copy result to paste the answer elsewhere.
DEG and RAD mode
DEG means degrees. Use DEG when a problem says angles like 30 degrees, 45 degrees, or 90 degrees. RAD means radians. Use RAD for expressions written in radians, such as many calculus, physics, and advanced math problems.
Choose the angle mode before calculating a trigonometry expression. For example, sin(30) in DEG mode returns 0.5, while RAD mode treats 30 as radians. That one switch can turn a correct-looking expression into the wrong answer.
Supported expression types
Trig: sin, cos, tan, asin, acos, and atan.
Logs: log for base 10 and ln for natural log.
Roots: sqrt for square root and cbrt for cube root.
Powers: use x^y style expressions such as 2^5.
Scientific notation: type 1e3 for 1000 or 2.5e-4 for 0.00025.
Constants: use pi and e inside expressions.
Grouping: use parentheses to control calculation order.
Keyboard examples
Examples from the scientific calculator
1
1
30
36
11
1650
16
Common mistakes to check
If an answer looks strange, check the angle mode first. Then check missing parentheses, negative signs, exponent grouping, and whether you typed a valid value for the function. Logs need positive inputs, square roots need non-negative inputs, and asin or acos need a value from -1 to 1.
Error usually means the expression cannot be evaluated as typed. It does not mean the formula is impossible. It usually means one part of the input needs to be cleaned up before you try again.
When not to rely on it alone
This page gives numeric results. It does not graph functions, solve symbolic algebra, show every derivation step, or keep exact radical and fraction forms. For classwork, use the format your teacher expects. For engineering or lab work, treat this as a fast check before using the required calculator, spreadsheet, or software for the final result.
History, privacy, and copying
Recent scientific expressions stay visible in the history panel so you can compare answers and reopen an expression. This history is only kept in the current browser tab while you use the page.
Copy result copies the current displayed result to your clipboard. The calculator does not need an account, and the expression history is not sent to a server.