Scientific Calculator
A full scientific keypad for arithmetic, trig, logs, powers and roots.
How to use Scientific Calculator
A free online scientific calculator with a full keypad: trig, logs, powers, roots, factorial, constants, memory and angle modes. Runs locally in your browser.
Tap digits, operators and functions to build an expression. The display updates as you type and shows the result after you press =.
Use ( ) to group parts of a long expression. Standard math precedence applies: powers and roots before multiplication/division before addition/subtraction.
Press 2nd to switch the trig buttons to their inverses (sin⁻¹, cos⁻¹, tan⁻¹, sinh⁻¹, cosh⁻¹, tanh⁻¹) and to swap ln/eˣ and log₁₀/10ˣ.
Tap Rad / Deg to match your problem. Trigonometric results change depending on the active angle mode.
Store values with mc, m+, m− and recall them with mr. Memory is kept only for the current page session.
Worked example. To compute sin(30°), set the mode to Deg, tap sin ( 30 ) =. The answer is 0.5.
Tips for accurate results.
Parentheses control precedence when an expression is ambiguous.
Choose the right angle mode before using sin, cos or tan.
Press AC to clear the display before starting a new calculation.
When to use Scientific Calculator. Everyday arithmetic, school and engineering math, spreadsheet formula checks, quick roots and powers, and trig/log calculations without installing software.
When you actually reach for this
- You want functions (trig, logs, powers) beyond basic arithmetic.
- You are doing engineering, stats or school math.
Where this tool stops being accurate
- It shares the same floating-point limits as any calculator, so extreme values lose precision.
- Angle mode (degrees versus radians) must match your problem or trig results are wrong.
Frequently asked questions
Why did my answer differ from what I expected?
Operator precedence: multiplication and division run before addition and subtraction. 2 + 3 × 4 is 14, not 20, unless you group with parentheses. The calculator follows standard math order, so add brackets when you mean a different sequence.
How do I take a square root or a power?
Use the function keys: square root acts on the current display, and the power key raises the preceding value to the next one you enter. They are single-argument operations, so enter the base first, press the key, then enter the exponent if needed.
Does it keep a history of my calculations?
This minimal version shows the live display only; it does not store a running tape. For a record, note each result as it appears. The calculation itself runs locally and privately, with nothing saved between sessions.
Degrees or radians?
Set the mode to match your inputs; sin of 30 in degrees is 0.5, but in radians it is about minus 0.95.
Why does my answer look off?
Usually the angle mode or operator precedence; check those before suspecting the math.