Math
Scientific Calculator
Keyboard-first scientific calculator with DEG/RAD trig, 2nd functions, memory, history, and display modes.
Free to use — no sign-up or login.
Keyboard: digits and operators type in the expression field · Enter or = evaluate · Backspace delete · Esc/Delete clear · p inserts π
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This scientific calculator is built for expressions that go beyond basic arithmetic: trigonometric functions, logarithms, powers, and more. Enter an expression with the keyboard or keypad, check the angle setting, then press Enter or Equals. You can reuse your last result with Ans instead of copying a long number by hand.
Choose DEG for angles measured in degrees, such as a 30° triangle angle, or RAD for radians used in calculus and many physics formulas. The 2nd key exposes inverse or alternate functions. AUTO, FIX, SCI, and ENG change how answers are displayed, while memory keys help you carry a value between calculations. The display mode does not make an approximate computation exact. For simpler percent arithmetic, try the Percentage Calculator.
Angle mode changes the meaning of trig inputs
In DEG mode, sin(30) is 0.5 because the input represents 30 degrees. In RAD mode, the corresponding expression is sin(π/6), also 0.5. Leaving RAD selected and typing sin(30) asks for the sine of 30 radians, which is a different number. The calculator applies DEG/RAD to ordinary trigonometric and inverse trigonometric functions; hyperbolic functions use radians regardless of the selected angle mode.
Results, memory and display formats
Use Ans to insert the most recent successful result into the next expression. MC clears stored memory, MR recalls it, MS stores a value, and M+ or M− changes the stored value. History keeps up to 20 results locally in this browser; it is not a cloud backup or cross-device record. SCI displays scientific notation and ENG groups exponents in multiples of three. FIX and the Digits setting control displayed precision, which can hide small differences between numerical results.
Worked example: sin in DEG and RAD
In DEG mode: sin(30) = 0.5. In RAD mode: sin(π/6) = 0.5.
\[ \sin(30^{\circ})=0.5=\sin(\pi/6) \]
Worked example: common log
log(1000) = 3 because this calculator's log key is base 10.
\[ \log_{10}(1000)=3 \]
Worked example: right-associative powers
2^3^2 = 512 under the calculator's right-associative exponent rules: 2^(3^2), not (2^3)^2.
\[ 2^{3^{2}}=2^{9}=512 \]
Frequently asked questions
Why is sin(90) wrong in RAD mode?
In radians, 90 means 90 rad (≈14.32π), not a right angle. Use DEG mode for degree inputs, or convert first: 90° = π/2 rad ≈ 1.5708.
What does Ans do?
Ans recalls the last successful Equals result so you can chain calculations without retyping (for example Ans×2).
What is the difference between log and a natural logarithm?
Here log means base-10 logarithm: log(1000) = 3. Natural logarithms use base e. Select the appropriate function for the equation you are solving.
Do SCI and ENG change the calculated value?
No. They change the numerical display. SCI uses powers of ten; ENG uses exponents in multiples of three. A rounded display can show fewer digits than the internal result.
Does calculator history sync to my account?
No. The recent-history list is stored locally in your browser, so it should not be treated as permanent storage.
Sources
Assumptions and limitations
This is a numerical scientific calculator, not a symbolic algebra system. It does not solve equations symbolically or guarantee exact decimal answers. Results have finite numerical precision, and some expressions are undefined or outside supported domains. Check DEG/RAD before evaluating trigonometric expressions; hyperbolic functions are interpreted in radians.