A scientific calculator handles maths beyond basic arithmetic — trigonometry, logarithms, powers, roots, and complex expressions. You used one in school. You probably need one occasionally for work, study, or personal calculations. Opening an app for an occasional calculation is overkill; an online calculator loads in two seconds from any browser on any device.
This guide covers the functions available in the online scientific calculator and how to use the ones that people most commonly get wrong.
Functions Available in the Calculator
- Trigonometry — sin, cos, tan, and their inverses (sin⁻¹, cos⁻¹, tan⁻¹)
- Logarithms — log (base 10) and ln (natural logarithm, base e)
- Powers and roots — x², x³, xⁿ, √x, ∛x, ⁿ√x
- Constants — π (3.14159...) and e (2.71828...)
- Factorial — n! for combinatorics and probability
- Percentage — direct percentage calculations
- Memory — M+, M−, MR, MC for storing intermediate values
Step-by-Step: Use the Online Scientific Calculator
Go to webtoolsz.com/scientific-calculator. No sign-up needed, works on mobile.
For everyday trigonometry problems, use DEG (degrees). For calculus and engineering, switch to RAD (radians).
Click the function buttons in the order you would write the expression. Use parentheses for grouping.
The result appears immediately. You can continue using the result in further calculations.
Quick Reference: Common Calculations
- Hypotenuse of a right triangle: √(a² + b²)
- Area of a circle: π × r²
- Compound interest: P × (1 + r/n)^(nt) — use xⁿ for the power
- Permutations: n! / (n−r)!
- Convert degrees to radians: degrees × π / 180
- pH calculation: −log([H⁺]) — use the log button
Open Scientific Calculator — Free
Full trig, log, powers, and roots. No app, no sign-up, works on mobile.
Open Scientific CalculatorFrequently Asked Questions
What functions does the online scientific calculator include?
The calculator includes: basic arithmetic (+, -, ×, ÷), trigonometric functions (sin, cos, tan, and their inverses), logarithms (log base 10 and natural log ln), powers and roots (x², √, xⁿ, ⁿ√), factorial (!), constants (π, e), percentage, and memory functions (M+, M-, MR, MC).
Does the calculator work in degrees or radians?
Both. You can switch between degree (DEG) and radian (RAD) mode. Trigonometric functions (sin, cos, tan) produce different results depending on which mode is active. For most school maths, use degree mode. For calculus and engineering, radian mode is standard.
Can I use this calculator on my phone?
Yes. The online scientific calculator is fully responsive and works on smartphones and tablets. Touch input works naturally — tap buttons just as you would on a physical calculator.
Is calculation history saved?
Calculations run in the browser only. There is no account, no history stored on a server. If you close the tab, your calculation history is cleared. If you need to keep a record, copy your results manually.