A complete online scientific calculator for advanced mathematical computations.
Supports trigonometry (sin, cos, tan) in degree/radian mode, logarithms (log, ln, log2), powers, roots, factorials, constants (pi and e), and memory functions (MC/MR/M+/M-). History of the last 10 calculations.
Calculator information
๐ How to use this calculator
- Choose the angle mode: degrees (DEG) or radians (RAD) for trigonometric functions.
- Use function keys (sin, cos, tan, log, ln, sqrt, x^2, x^y) for standard operations.
- For constants, press pi for 3.14159... or e for the natural base 2.71828...
- Use the memory keys (M+, M-, MR, MC) to store and recall intermediate results.
- Press = to evaluate; the result is added to the history of the 10 most recent calculations.
- Use AC for a full reset, or DEL to delete the last character.
๐งฎ Advanced math functions
Trigonometry: sin(theta), cos(theta), tan(theta); Logarithm: log_a(x) = ln(x)/ln(a); Power: x^y = e^(y*ln(x))
- theta: angle in radians (pi rad = 180 deg)
- ln: natural logarithm, base e
- log: logarithm base 10
- log2: logarithm base 2
- x^y: x raised to the power y
- n!: factorial = n x (n-1) x ... x 1
Angle conversion: rad = deg x pi/180; deg = rad x 180/pi. Basic trig identity: sin^2(theta) + cos^2(theta) = 1.
๐ก Worked example: Computing the elevation angle from height and distance
Given:- Pole height: 15 meters
- Horizontal distance: 25 meters
- Find the elevation angle theta
Steps:- Use arctan: theta = arctan(height / distance) = arctan(15/25)
- Make sure DEG mode is active
- Compute: 15 / 25 = 0.6
- arctan(0.6) = 30.964 deg
- Round: ~ 30.96 deg
Result: The elevation angle from the observation point to the top of the pole is 30.96 degrees.
โ Frequently asked questions
What is the difference between DEG and RAD on a scientific calculator?
DEG (degrees) is the everyday angle unit where one full turn = 360 degrees. RAD (radians) is the mathematical unit where one full turn = 2*pi ~ 6.283 rad. Many advanced math and physics formulas (especially calculus) use radians by default. Make sure the calculator mode matches before computing sin, cos, or tan.
What is the difference between log and ln?
log (sometimes log10) is the base-10 logarithm, e.g., log(1000) = 3. ln is the natural logarithm with base e ~ 2.71828, widely used in calculus, statistics, and biology (exponential growth). Relationship: log(x) = ln(x)/ln(10) ~ ln(x)/2.303. For other bases, use log_a(x) = ln(x)/ln(a).
What is a factorial and when is it used?
The factorial n! is the product of all positive integers up to n, e.g., 5! = 5 x 4 x 3 x 2 x 1 = 120. By definition 0! = 1. Factorials are used in combinatorics (combinations, permutations), Taylor series, and probability. Large values grow extremely quickly: 20! ~ 2.4 x 10^18, so calculators typically cap input around ~170.
How do I compute an nth root?
The nth root of x can be computed as x^(1/n). Example, the cube root of 27: 27^(1/3) = 3. On a scientific calculator, use the x^y key with a fractional exponent (1/3 = 0.3333...) or the dedicated nth-root key if available. Square roots have a dedicated sqrt key.
What do the M+, M-, MR, MC memory functions do?
M+ adds the current value to memory. M- subtracts the value from memory. MR (Memory Recall) brings the stored value back to the display. MC (Memory Clear) wipes the memory. Useful for multi-step calculations, e.g., summing several subtotals without writing them down. Some calculators offer multiple memory slots (A, B, C, M).
๐ Sources & references
Last updated: May 11, 2026