History
This scientific calculator handles sin, cos and tan and their inverses in degrees or radians, log and ln, powers, roots, factorials, π and e, with the answer shown as you type and a history of every result. It runs in the browser, works with the keyboard and keeps 12 significant digits.
How to use
- Type with the keypad or your keyboard. The result appears as you type.
- Press = or Enter to finish. The result stays on screen, so you can keep calculating with it.
- Tap f(x) for sin, cos, tan, logs, powers, roots and factorials; DEG switches between degrees and radians.
- Tap a history row to copy its result; tap it again to insert the result into your calculation.
- Percent works like on a pocket calculator: 200 + 10% = 220, 200 − 10% = 180, 50 × 10% = 5.
- Multiplication can be implied: 2π, 3(4+5) and (1+2)(3+4) all work. Missing closing parentheses are added for you.
- Results are rounded to 12 significant digits, so 0.1 + 0.2 shows 0.3.
- You can type function names too: sqrt, sin, cos, tan, asin, ln, log, abs, pi, e and Ans (the last result).
Degrees or radians
Trigonometric functions depend on the angle unit. In DEG mode sin 30 = 0.5 and cos 60 = 0.5; in RAD mode the same keys expect radians, so sin(π/6) = 0.5 while sin 30 gives about −0.988. Check the DEG indicator before trusting a trig result; it is the most common source of wrong answers.
Inverse functions return angles in the current unit: asin 0.5 = 30 in degrees or about 0.5236 in radians.
Logarithms, powers and roots
log is the base-10 logarithm and ln the natural logarithm with base e ≈ 2.71828: log 1000 = 3 and ln e = 1. Use ^ for powers (2^10 = 1024) and sqrt for square roots; other roots work as fractional powers, so the cube root of 27 is 27^(1/3) = 3. The factorial n! multiplies 1 × 2 × … × n, so 5! = 120.
Precision
Results keep 12 significant digits, enough for school, university and most engineering work. Very large or small numbers switch to scientific notation; for exact integer arithmetic with huge values, use a dedicated tool such as the base converter.
Frequently asked questions
Why does sin 30 give a strange number?
The calculator is in radian mode. Switch to DEG and sin 30 returns 0.5; in radians, 30 is about 1719°, whose sine is about −0.988.
What is the difference between log and ln?
log uses base 10 (log 100 = 2), ln uses base e (ln e = 1). To get a logarithm in another base, divide: log₂ 8 = ln 8 ÷ ln 2 = 3.
How do I enter a power or a root?
Type ^ for a power, such as 3^4 = 81, and sqrt for a square root. For a cube root, raise to 1/3: 64^(1/3) = 4.
How do I calculate a factorial?
Use the factorial key under f(x) or type the number followed by !: 6! = 720.
Can I convert degrees to radians?
Multiply degrees by π/180: 90 × π/180 ≈ 1.5708. The unit converter also converts angles directly.
Does it follow the order of operations?
Yes. Functions and powers come first, then multiplication and division, then addition and subtraction, with parentheses overriding all of them.