Free Online Scientific Calculator
Answers come out exact, like √2/2.
- Fractions and roots look like your textbook
- Exact ⇔ decimal in one tap (S⇔D)
- Free, nothing to install, runs in your browser
How to use it
Fractions with the fraction key
Press □/□ to get a top and bottom box. Type a number first and it becomes the numerator. Move between boxes with ▶ ◀.
Example: 1 □/□ 3 ▶ + 1 □/□ 6 = → 1/2Exact answers
sin 45 gives √2/2 and 1÷3 gives 1/3. Tap S⇔D under the result for the decimal. Expressions with a decimal point give a decimal right away (you can change this in Settings).
Example: √8 = 2√2 → S⇔D → 2.828427125More with SHIFT
The orange label above a key is its SHIFT function: press SHIFT, then the key. That is where sin⁻¹, 10ˣ, eˣ, nPr, nCr, Pol and Rec are.
Example: SHIFT sin 0.5 = → 30More tips
Keep going from the answer
Press + − × ÷ right after = to continue from Ans, the previous answer. Use ▲ ▼ to bring back an earlier expression and edit it.
Integrals, derivatives, sums
∫ gives a definite integral, SHIFT ∫ the derivative at a point and Σ a sum. Use x as the variable.
Example: Σ(x, 1, 100) = 5050Constants and units
The FUNC key holds 23 physical constants (CODATA 2022) such as the speed of light and Planck constant, plus conversions like in↔cm, lb↔kg and °F↔°C.
What each key does
Hover over a key to see its name too. Orange labels need SHIFT first.
- SHIFT
- Uses the orange function above the next key. SHIFT then sin gives sin⁻¹
- DEG·RAD·GRA
- Angle unit. Each press cycles degrees → radians → gradians
- Norm
- Number format (Normal, fixed decimals Fix, significant figures Sci). Opens settings
- S⇔D
- Switches the answer between exact (fraction, root, π) and decimal
- ENG
- Engineering notation: powers of ten in steps of 3 (k, M, m, μ)
- °′″
- Shows the answer in degrees-minutes-seconds. SHIFT ( enters °′″
- Factor
- Prime factorization of an integer answer (360 → 2³×3²×5)
- ▲ ▼
- ▲ recalls the previous calculation, ▼ the next. In a fraction, moves between boxes
- FUNC
- Function list: hyperbolic, integer (gcd etc.), probability, coordinates, constants, unit conversion. The ‘Table’ tab above is a separate screen that tabulates f(x)
- VAR
- Store and recall answers in A, B, C, D, M, x, y. M+ and M− live here
- log□
- Logarithm with a base you type. log₂8 = 3
- x□
- Power. Opens an exponent box; leave it with ▶
- Pol · Rec
- Coordinate conversion. Pol(x, y): rectangular → polar; Rec(r, θ): polar → rectangular
- Rnd
- Rounds the answer to the digits on screen for further use
- Ran#
- Random number from 0 up to 1 (three decimals)
- ÷R
- Division with remainder. 17 ÷R 5 → quotient 3, remainder 2
- ≈
- Calculate straight to a decimal instead of an exact value (SHIFT =)
- ×10ˣ
- Scientific notation such as 3×10⁸
Guides
- 6÷2(1+2) = 1 or 9? Order of operations on a calculatorImplied multiplication, −2² and why calculators disagree
- σ vs s: population or sample standard deviation?Divide by n or n − 1? A worked example
- Degrees vs radians: why sin 30 gives −0.988 on your calculatorSwitching the angle mode, with a conversion table
- Solving quadratic and simultaneous equationsQuadratic formula, discriminant, no or infinitely many solutions
- Permutations vs combinations: nPr and nCr explainedOrder matters → permutation; it doesn’t → combination
Frequently asked questions
Does it do everything a school scientific calculator does?
Almost everything a typical $20–30 student scientific calculator does: natural display of fractions and roots, trig, inverse and hyperbolic functions, logs, permutations and combinations, integrals, derivatives, Σ and Π, complex numbers, degrees-minutes-seconds, statistics and regression, normal, binomial and Poisson distributions, systems of up to 4 equations, polynomials up to degree 4, inequalities, matrices up to 4×4, vectors, base-n, tables of values, physical constants and unit conversions. It is not a graphing calculator.
Why is 6÷2(1+2) equal to 1 here?
A product written without the × sign, 2(1+2), is worked out before × and ÷, so it becomes 6÷6 = 1. Many scientific calculators do the same. If you want 9, type 6÷2×(1+2). The order of operations guide explains why.
Why does sin 30 give −0.988… instead of 0.5?
The angle unit is set to RAD (radians). Tap RAD at the top left of the screen to switch to DEG and you get 0.5 (exactly 1/2).
How do I get a decimal instead of √2/2?
Tap S⇔D under the result, or press SHIFT and then = (≈). Normal display shows 10 significant digits; Settings let you fix the decimal places (Fix) or significant figures (Sci).
Should I use σ or s for standard deviation?
Use σ (population standard deviation) when your data is the whole group, and s (sample standard deviation) when your data is a sample used to estimate a larger group. The statistics screen shows both.
Is anything I type sent to a server?
No. All calculations run in your browser. Only your settings, variables and history are saved, on this device. The Google ads on the page may use cookies (see the privacy policy).