How to Use This Scientific Calculator

Short answer: type with your keyboard or click the buttons, then press =. The calculator follows PEMDAS order of operations, so (3+4)×2 correctly gives 14.

  1. Basic math: click digits and + − × ÷, or just type on your keyboard — every key works.
  2. Trigonometry: set DEG or RAD mode first, then press sin, enter the angle, and hit =. Example: sin(30) in DEG mode = 0.5.
  3. Powers & roots: use xʸ for any exponent (2 xʸ 10 = → 1024), x² / x³ for squares and cubes, and √x for square roots.
  4. Scientific notation: press EE — typing 3 EE 8 enters 3×10⁸ (300,000,000).
  5. Memory: MS stores, MR recalls, M+/M− add or subtract, MC clears. Ans reuses your last result and AC resets everything.

Scientific Calculator Functions Explained

Every button on the calculator above, what it does, and a quick example:

Button Function Example
sin cos tan Trigonometric functions — set DEG/RAD mode first sin(30°) = 0.5
log Base-10 logarithm log(1000) = 3
ln Natural logarithm (base e ≈ 2.71828) ln(e²) = 2
√x ∴x Square root and cube root √144 = 12
xʸ Raise to any power 2ʸ = 1024
x² x³ Square and cube 9² = 81
1/x Reciprocal 1/4 = 0.25
n! Factorial 5! = 120
π e Constants pi (≈ 3.14159) and Euler’s number 2π ≈ 6.283
EE Scientific notation (×10^) 6.02 EE 23
|x| Absolute value |−7| = 7
% Percentage 200 × 15% = 30
MC MR M+ M− MS Memory: clear, recall, add, subtract, store —
Ans Inserts the previous answer —

Degrees vs Radians: Which Mode Should You Use?

Short answer: use DEG when your angles are in degrees (geometry homework, navigation), and RAD for calculus, physics, and engineering formulas. A full circle is 360° but only 2π radians.

The wrong mode is the number-one cause of wrong trigonometry answers. Compare: sin(30) = 0.5 in DEG mode but ≈ −0.988 in RAD mode. Same buttons, completely different answer — so always glance at the mode indicator before pressing = on a trig problem.

Scientific Calculator Examples

Try these on the calculator above to see each feature in action:

sin(30°) = 0.5  (DEG mode)
log(1000) = 3
√2 ≈ 1.41421
5! = 120
(3 + 4) × 2 = 14  (parentheses beat PEMDAS mistakes)
3 EE 8 = 300,000,000

Scientific Calculator FAQs

Is this scientific calculator free to use?
Yes — completely free, with no sign-up, no download, and no usage limits. It runs entirely in your browser on any phone, tablet, or computer.
Can I use this scientific calculator on my phone?
Yes. The calculator is fully responsive with large touch-friendly buttons, and on desktop you can also type every expression with your physical keyboard.
Why is my sin, cos, or tan answer wrong?
Almost always because of the angle mode. If your problem uses degrees (like sin 30°), the calculator must be in DEG mode; for calculus-style problems with π, switch to RAD. Check the mode indicator before calculating.
What is the difference between a scientific and a basic calculator?
A basic calculator handles only arithmetic (+ − × ÷). A scientific calculator adds trigonometry (sin, cos, tan), logarithms (log, ln), exponents and roots, factorials, constants (π, e), scientific notation, memory functions, and proper order-of-operations with parentheses.
Is my calculation data sent anywhere or stored?
No. Every calculation happens locally in your own browser — nothing you type is uploaded, stored, or tracked. Closing the tab wipes the slate clean.
Can I use this instead of a TI-30 or Casio for exams?
It is excellent for homework and practice because it mirrors the functions and PEMDAS logic of classroom calculators. For the actual SAT, ACT, or AP exam, check your test’s official calculator policy — most require an approved physical model at the test center.