Trigonometry, logarithms, exponents, roots and factorials — a full scientific calculator free in your browser. Keyboard supported.
Tap the buttons or type with your keyboard. Switch between DEG and RAD for angle mode.
Yes — sin, cos, tan, ln, log₁₀, powers, roots, factorials, π and e, plus memory keys.
Yes — digits, + − * / ( ) . and Enter work, Backspace deletes.
Yes, 100% free, no signup, runs entirely in your browser.
Your calculator is in radian mode. Trigonometric functions need to know whether the angle is in degrees or radians: sin(30°) = 0.5, but sin(30 radians) = −0.988. Switch the DEG/RAD toggle to degrees for everyday geometry and most school problems.
“log” is the base-10 logarithm: log(1000) = 3 because 103 = 1000. “ln” is the natural logarithm with base e (≈ 2.718): ln(e2) = 2. Base 10 suits engineering scales like decibels and pH; base e suits calculus, growth, and decay.
Use the power key (xy or ^): 2^10 = 1024. Roots are fractional powers — the nth root of x is x(1/n), so the cube root of 27 is 27^(1/3) = 3. Always wrap the fractional exponent in parentheses, or 27^1/3 evaluates as (27^1)÷3 = 9.
A scientific calculator extends basic arithmetic with the functions science and engineering actually use: trigonometry, logarithms, exponents, factorials, and constants. They all follow the standard order of operations — parentheses first, then exponents and roots, then multiplication and division, then addition and subtraction — so 2 + 3 × 42 evaluates as 2 + (3 × 16) = 50, not 320. When in doubt, add parentheses; they are never wrong.
Trigonometry (sin, cos, tan): sin(30°) = 0.5 — but only in degree mode; in radian mode sin(30) = −0.988, the single most common scientific-calculator error. Logarithms: log is base 10, so log(1000) = 3; ln is the natural log (base e ≈ 2.718), so ln(e2) = 2. Powers and roots: 210 = 1024; cube roots use fractional exponents, 27(1/3) = 3. Factorial: 5! = 5 × 4 × 3 × 2 × 1 = 120, the backbone of probability and combinatorics. Constants: π ≈ 3.14159 and e ≈ 2.71828 are built in — never type rounded approximations by hand.
Check the DEG/RAD indicator before any trig work — exams are lost to this one toggle more than any other mistake. Chain calculations with the answer key or parentheses instead of retyping rounded intermediate results; rounding early compounds error. And use keyboard entry for speed: digits and operators type directly, which turns long physics and finance problem sets from tedious to fast.
Long calculations get manageable with the memory keys: M+ adds the displayed value to memory, MR recalls it, MC clears it — ideal for formulas you reuse mid-problem, like a tax rate or a physical constant. For very large or small results, switch to engineering notation (exponents in multiples of 3: 4.7E6 instead of 4700000), which keeps numbers readable and lines up with kilo-, mega-, and micro- prefixes. And when a result shows 0.30000000000000004 instead of 0.3, that is floating-point arithmetic, not an error — computers store decimals in binary, so tiny representation dust appears; round the final answer to a sensible number of significant figures and move on.
This free online scientific calculator handles the math your basic calculator cannot: trigonometry (sin, cos, tan), logarithms (ln, log base 10), exponents, roots, factorials, and the constants pi and e. It is ideal for students, engineers, and anyone working through homework or technical problems on a phone or computer.
A common mistake is solving trig problems in the wrong angle mode. Tap DEG for degrees or RAD for radians before calculating sin, cos, or tan — the mode is shown clearly on the keypad. You can type with your keyboard too: digits, + - * / ( ) . and Enter all work, and Backspace deletes the last character. Memory functions (M+, M-, MR, MC) let you store intermediate results for multi-step problems. Everything runs locally in your browser, so your calculations are private and the tool works offline once loaded. 100% free, no signup.