Free Online Scientific Calculator With Fractions, Algebra & Trig
Use our free online scientific calculator to solve algebra equations, compute fractions, and work through trigonometry all in one place. Students use it for homework, engineers use it for quick field calculations, and teachers use it to demonstrate concepts in class. You get 30+ math functions, a dedicated fraction calculator, RAD/DEG toggle, and full keyboard support.
⌨️ Keyboard: numbers, + − * /, Enter (=), Escape (AC), Backspace · FRAC mode: type numerator, press / for denominator
Fraction Mode
Press FRAC to enter fractions. Type the numerator, press /, type the denominator, then use + − × ÷ as usual. The result auto-simplifies.
2nd Mode
Press 2nd to switch sin→sin⁻¹, cos→cos⁻¹, tan→tan⁻¹, √x→sinh, log→10^x, and ln→e^x.
Memory for Algebra
Store one part of your equation with MS, calculate the next part, then press MR to bring the first part back.
Reuse History
Click any item in the history panel to paste its result straight into the display.
Fractions
Trigonometry
Hyperbolic (2nd)
Logarithms
Powers & Roots
Algebra
Ratio of circumference to diameter
Base of natural logarithm
Golden ratio = (1 + √5) / 2
If you have ever typed a trig problem into a basic calculator and got a completely wrong answer, you already know the problem. A standard calculator does not handle sine, cosine, or logarithms. A scientific calculator does along with fractions, exponents, roots, and dozens of other functions students and professionals use every day.
This free online scientific calculator gives you every function a physical TI-30 or Casio fx-85 offers plus features they do not, like a dedicated fraction mode, calculation history, and keyboard shortcuts. You do not need to buy anything or download an app. Open the page and start calculating.
Who Uses a Scientific Calculator?
Students
You need a scientific calculator from GCSE/high school algebra through university-level calculus, physics, and chemistry. It handles fractions, exponents, trig functions, and logarithms everything a basic calculator skips.
Engineers
Engineers calculate impedance, stress, signal frequencies, and heat transfer daily. Trig and logarithm functions are central to electrical, mechanical, and structural engineering work.
Scientists
Chemistry uses pH = −log[H⁺]. Physics uses e^(−kt) for decay. Biology uses ln for growth rates. A scientific calculator is the standard tool for quantitative research in every science.
Scientific Calculator with Fractions Why It Matters
Most online calculators display fractions as decimals. That creates a problem. When you calculate 1/3 + 1/6, the exact answer is 1/2 not 0.499999 due to floating-point rounding. This calculator keeps fractions as fractions. You see 1/2, not 0.5, which matters whenever exact values are required in algebra homework, chemistry equations, or financial calculations.
What the fraction calculator does:
Every result is automatically simplified using the greatest common divisor. You never need to simplify fractions manually.
How to Use a Scientific Calculator for Algebra
Algebra problems often look complicated, but a scientific calculator breaks them down into manageable steps. Here is how students typically approach the most common algebra operations.
| Algebra Task | Which Button | Example |
|---|---|---|
| Squaring a number | x² | 5² → enter 5, press x² → 25 |
| Any exponent | x^y | 2⁸ → enter 2, x^y, enter 8, = → 256 |
| Square root | √x | √169 → enter 169, press √x → 13 |
| Cube root | ∛x | ∛27 → enter 27, press ∛x → 3 |
| Fractions in algebra | FRAC | 1/2 + 3/8 → use fraction mode → 7/8 |
| Absolute value | |x| | |−15| → enter −15, press |x| → 15 |
| Factorial (counting) | n! | 6! → enter 6, press n! → 720 |
| Modular arithmetic | mod | 17 mod 5 → enter 17, mod, enter 5, = → 2 |
All Scientific Calculator Functions Explained
Trigonometric Functions: sin, cos, tan
Trigonometric functions connect angles to side ratios in triangles. sin(θ) gives you opposite ÷ hypotenuse, cos(θ) gives adjacent ÷ hypotenuse, and tan(θ) gives opposite ÷ adjacent (which also equals sin/cos). You use them to find unknown sides or angles in any right triangle. When you know a ratio and need the angle, press 2nd first to switch to inverse trig (sin⁻¹, cos⁻¹, tan⁻¹).
Logarithmic Functions: log, ln, log₂
A logarithm answers the question: "What power do I raise the base to, to get this number?" log(x) uses base 10 so log(100) = 2 because 10² = 100. You see this in pH calculations (pH = −log[H⁺]) and the decibel scale. ln(x) uses base e (≈2.718) and appears in calculus, radioactive decay formulas, and compound interest. log₂(x) uses base 2 you see it in computer science when analyzing how many times you can split a list in half (binary search: O(log₂ n) steps).
Powers and Roots: x², x³, x^y, √x, ∛x
Power functions raise a number to an exponent. x² squares it, x³ cubes it, and x^y raises it to any power you enter. Root functions reverse this. √x finds the square root (which power gives you this number when squared?), and ∛x finds the cube root. You need these constantly in geometry (area and volume formulas), the Pythagorean theorem, and polynomial algebra.
Exponential Functions: e^x and 10^x
e^x raises Euler's number (e ≈ 2.718) to the power x. It is the inverse of ln, which means e^(ln x) = x. You meet e^x in continuous growth and decay population models, the half-life formula N = N₀e^(−λt), and the normal distribution in statistics. Access it with 2nd + ln. 10^x reverses the log function — if log(x) = 3, then 10³ = 1000. Access it with 2nd + log.
Factorial: n!
n! multiplies every positive integer from 1 up to n. So 5! = 5 × 4 × 3 × 2 × 1 = 120. By definition, 0! = 1. You use factorials to count arrangements (permutations) and selections (combinations). The number of ways to arrange 8 people in a queue is 8! = 40,320. The number of 5-card poker hands from 52 cards is C(52,5) = 52! / (5! × 47!) = 2,598,960. This calculator handles n! for all integers from 0 to 170.
Hyperbolic Functions: sinh, cosh, tanh
Hyperbolic functions look similar to trig but they describe hyperbolas rather than circles. sinh(x) = (eˣ − e⁻ˣ)/2 and cosh(x) = (eˣ + e⁻ˣ)/2. You encounter them in special relativity (relativistic velocity uses tanh), the catenary curve (the natural shape of a cable hanging under its own weight follows cosh), and solutions to differential equations in engineering. Access all three with the 2nd button.
Built-In Fraction Calculator
Press FRAC to enter fractions directly. Add, subtract, multiply, and divide fractions and get exact simplified results not decimal approximations. Convert to decimal with one click.
100% Free — No Limits
Every function including fractions, trig, logarithms, and hyperbolic functions is free. No account, no subscription, no ads, no download.
Full Keyboard Support
Type your entire calculation from the keyboard. Digits and operators work as expected. Keyboard shortcuts for sin (s), cos (c), tan (t), log (l), ln (n), and √x (r).
30+ Advanced Math Functions in One Tool
Trigonometry, inverse trig, hyperbolic trig, three logarithm bases, exponentials, powers, roots (square and cube), factorial, floor, ceiling, round, absolute value, modulo, and more.
Clear Error Messages
When you enter an invalid operation like log of a negative number or tan of 90° the calculator tells you exactly why it failed. You learn from the error, not just see 'ERROR'.
30-Entry Calculation History
Every calculation saves automatically, including fraction operations. Click any history entry to restore that result instantly. Great for checking multi-step work or recovering a mistyped value.
5-Register Memory
MS, MR, MC, M+, and M− let you store, recall, and accumulate values across multiple calculations. The stored value always shows as a green badge so you never lose track.
Works on Any Device
Large touch-friendly buttons, readable fonts, and a responsive layout mean this works equally well on a phone, tablet, or desktop. No zoom required.
Always check RAD vs DEG before trig
This is the single most common mistake students make. In RAD mode, sin(90) = 0.894. In DEG mode, sin(90) = 1. Check the badge in the display before every trig calculation.
Use FRAC mode when you need exact fraction results
Entering 1/3 on a standard calculator gives 0.333…, which accumulates rounding error in multi-step problems. In FRAC mode, 1/3 stays as 1/3 until you explicitly convert it.
Break algebra problems into steps using memory
Long expressions are easier when you compute each part separately. Calculate the first sub-expression, press MS to save it, then calculate the rest, and use MR or M+ to combine them.
Use ⌫ instead of AC when you mistype one digit
Press the backspace button (⌫) to delete just the last character. This saves you from clearing the entire expression when you only made a small typing error.
Verify your answer using the inverse function
After calculating log(x) = y, verify it by pressing 2nd + log to compute 10^y you should get x back. This sanity check works for any function/inverse pair (ln/e^x, sin/sin⁻¹, etc.).
Review the history panel to find mistakes
If your final answer looks wrong, open the history panel and read through each step. Spotting where you entered the wrong value is much faster than re-deriving everything from scratch.