Scientific Calculator Online
A full-featured scientific calculator with trig, inverse trig, logs, exponents, factorial, nCr, nPr, three angle modes, memory, and a history strip. Works the same on a phone or a laptop. Nothing is sent to a server.
Keyboard shortcuts
Worked examples
Example 1 — sin 45° in DEG mode
Toggle S⇔D after the calculation to switch between the decimal 0.7071… and the surd form √2/2.
Example 2 — 5 factorial (combinations setup)
For "how many ways to pick 3 from 8", use nCr(8, 3). Result: 56.
Example 3 — Natural log and exponent chain
Cross-check by pressing e, ^, ANS, =. The answer should return to 7.
Example 4 — Quadratic formula step
How to use a scientific calculator
Three things separate scientific calculators from a four-function one: angle modes, function keys, and the order in which keys take effect. Get those right and the rest is just careful typing.
Set the angle mode first
Before any trig calculation, click DEG, RAD, or GRAD in the status bar. School trig usually uses degrees (sin 30 = 0.5). Calculus, physics, and most maths past A-Level use radians (sin π/6 = 0.5). GRAD divides a full circle into 400 units and is rare outside surveying. The current mode shows on the pill — if you ever get a "weird" trig answer, this is the first thing to check.
Use brackets for order of operations
The calculator follows standard PEMDAS / BODMAS. So 2 + 3 × 4 = 14, not 20. To force a different order, use brackets: (2 + 3) × 4 = 20. Functions also apply only to what's inside their bracket — sin(30) + 1 is not the same as sin(30 + 1). When in doubt, add the bracket. The display shows the full expression so you can spot a mistyped bracket before pressing equals.
Watch the degree vs radian trap
Computing sin 30 in RAD mode gives −0.988, not 0.5. The most common scientific-calculator mistake is leaving the wrong angle mode set after a previous calculation. The status pill flips colour to make this obvious — but glance at it before every trig press anyway.
Memory and ANS for chained work
For a quick previous-answer recall, press ANS. For a value you want to reuse multiple times across an unrelated calculation, store it with M+ (adds to memory), then call it back with MR. MC wipes the memory. M− subtracts the current expression from memory — useful for running totals. The mem strip above the display shows both ANS and M values at all times.
Fraction vs decimal display
After computing a result with a surd or fraction in it, press S⇔D to flip between the exact form (√2/2, 1/3, π/6) and the decimal (0.7071…, 0.3333…, 0.5236). Exam working usually expects surd form; engineering work usually expects the decimal. Keep both available with one button.
Frequently asked questions
How do I calculate factorial on a scientific calculator?
Type the number, then press the x! button. 5 x! = 120 (because 5 × 4 × 3 × 2 × 1 = 120). 0! is defined as 1.
Factorial grows fast — 10! is 3,628,800 and 20! is 2.43 × 10^18. Most calculators stop returning exact values around 70! because the answer exceeds floating-point range; expect scientific notation above that. Use factorial in probability, combinations, permutations, and series expansions like sin x = x − x³/3! + x⁵/5! − …
How do I switch between degrees and radians?
Click the DEG / RAD / GRAD pill at the top of the calculator. The current mode shows next to the display.
DEG is the school default — sin 30 = 0.5. RAD treats inputs as radians — sin(π/6) = 0.5. GRAD divides a circle into 400 units. To convert manually: radians = degrees × π/180, degrees = radians × 180/π. Trig answers depend on the mode, so set it before pressing any function or you will get a wrong answer.
What is the ANS button for?
ANS inserts the most recent result into the current expression. After 12 × 7 = 84, pressing ANS + 6 gives 84 + 6 = 90.
Useful for chained calculations where each step depends on the last — compound interest year by year, physics step problems, or building up a running total. ANS persists across the session until you clear it or close the tab. The on-screen ANS chip near the display shows the current value at any time.
How do I use nCr and nPr for combinations and permutations?
nCr counts unordered selections. nPr counts ordered ones. nCr(5, 2) = 10. nPr(5, 2) = 20.
Click the button, then type two numbers separated by a comma. The formulas are nCr(n,r) = n! / (r!(n−r)!) and nPr(n,r) = n! / (n−r)!. Used in probability problems, lottery odds, team selections, and how-many-ways-can-you-arrange questions in exams.
What is the difference between log and ln?
log is logarithm base 10. ln is logarithm base e (≈ 2.71828, called Euler's number). log 100 = 2; ln(e) = 1.
Use log for chemistry (pH), acoustics (decibels), and order-of-magnitude work. Use ln for calculus, exponential growth and decay, and most pure-maths problems. To switch bases manually: log_b(x) = ln(x) / ln(b). So log₂(8) = ln(8) / ln(2) = 3 on a calculator without a direct log₂ button.
Can I use this scientific calculator for JEE or NEET preparation?
For practice and homework, yes. For the actual JEE Main, JEE Advanced, or NEET exam, calculators are not allowed.
Every function the JEE/NEET physics, chemistry, and maths syllabus needs is here. Use this tool for revision, mock-test checking, and learning button workflows. Pair it with practice books — the calculator is a verification tool, not a shortcut around the working.
How do I convert degrees to radians?
Multiply degrees by π/180. So 30° = π/6 ≈ 0.5236 rad, 45° = π/4 ≈ 0.7854 rad, 60° = π/3 ≈ 1.0472 rad.
To convert back, multiply radians by 180/π. Or change the calculator's angle mode — set RAD for radian input, DEG for degree input. Most secondary-school trig is in degrees; calculus, physics, and engineering normally work in radians. Always check the mode pill before pressing sin, cos, or tan.
How do I use inverse trig functions (arcsin, arccos, arctan)?
Use the sin⁻¹, cos⁻¹, tan⁻¹ buttons. Enter a value between −1 and 1 for sin⁻¹ and cos⁻¹.
Output is an angle in the current mode. asin(0.5) = 30° in DEG mode, or π/6 ≈ 0.5236 in RAD mode. Use inverse trig to find an angle given a side ratio: in a right triangle with opposite = 3 and hypotenuse = 5, the angle is asin(3/5) ≈ 36.87°. atan returns angles from −90° to 90°.
What is 4 to the power of 3?
4 to the power of 3 equals 64. Calculation: 4 × 4 × 4 = 64.
The notation 4³ is read as "four cubed" or "four to the third". Use the x³ button for cubes, or the x^y button for any power. Other common powers of 4: 4¹ = 4, 4² = 16, 4³ = 64, 4⁴ = 256, 4⁵ = 1,024. On the calculator, type 4, press ^, type 3, press =.
What is the square root of 2?
√2 is approximately 1.41421356. It is irrational — the decimal expansion goes on forever without repeating.
√2 appears in geometry (diagonal of a unit square), trigonometry (sin 45° = √2/2 ≈ 0.7071), and physics. For three-decimal work use 1.414. Press the √ button, type 2, press =. Toggle S⇔D to see the exact form √2 instead of the decimal — useful for surd-form answers in exam working.
What is log base 2 of 2?
log₂(2) = 1. The base-b log of a number is the power you raise b to in order to get that number.
Useful values: log₂(1) = 0, log₂(4) = 2, log₂(8) = 3, log₂(16) = 4, log₂(1024) = 10. log₂ matters in computer science (binary, information theory, big-O analysis). Without a direct log₂ button, compute log₂(n) as log(n) / log(2) — that change-of-base trick works for any base.
How do I simplify a square root?
Find the largest perfect-square factor and take its root out. √72 = √(36 × 2) = 6√2 ≈ 8.485.
√48 = √(16 × 3) = 4√3. √200 = √(100 × 2) = 10√2. If a number has no perfect-square factors greater than 1 (like 7, 11, 13), the surd is already simplified. The calculator's S⇔D toggle shows the simplified exact form where possible — handy for checking surd answers in algebra and geometry questions.
What is the order of operations on a calculator?
The calculator follows PEMDAS / BODMAS: parentheses, exponents, multiplication and division, then addition and subtraction.
So 2 + 3 × 4 = 14, not 20. Use brackets to force a different order: (2 + 3) × 4 = 20. Functions like sin, log, and √ apply to whatever is in their bracket. Negative numbers under powers need brackets too: (−2)² = 4 but −2² = −4.
References
- Wolfram MathWorld — definitions and identities for trig, log, and combinatorics functions used in this calculator.
- Khan Academy — Trigonometry — free worked-through lessons for sin/cos/tan and their inverses.
- NIST Fundamental Physical Constants — authoritative values for π, e, and physics constants used in the worked examples.
- IEEE 754 Floating-Point Standard — the precision model that limits factorial above ~170! and other large-number calculations.
Trigonometric value pages
Exact value, decimal, and formula for the standard trig angles.
Logarithm value pages
Square roots, factorials, powers
How-to guides and concept explainers
Buying guides (India)
Fraction to decimal conversions
Step-by-step pages for the 47 most-searched fraction conversions. Browse all fraction pages on the Fraction Calculator hub.