Scientific Calculator
Trigonometry, logs, powers, roots, and memory — built for real work, free forever.
What This Scientific Calculator Can Do
This is a full scientific calculator built for the browser — trigonometric functions, logarithms, exponents, roots, factorials, and memory storage, all without installing anything or creating an account. It works the same way on a laptop and on a phone, and every keypress is also mapped to your keyboard.
Degrees vs Radians: Which Should You Use?
- Degrees (DEG): The everyday unit for angles — a full circle is 360°. Use this for geometry, navigation, and most school-level trigonometry.
- Radians (RAD): The unit calculus and physics are built on — a full circle is 2ฯ. Use this when working with derivatives, integrals, or wave functions.
Key Features
- ✓ Trigonometric functions with inverse mode (sin, cos, tan, sin⁻¹, cos⁻¹, tan⁻¹).
- ✓ Logarithms in base 10 and natural log (ln).
- ✓ Powers and roots: x², x³, xสธ, √x, ³√x, eหฃ.
- ✓ Memory functions (M+, M−, MR, MC) that persist across calculations.
- ✓ A running history tape so you can see your last few calculations at a glance.
Understanding the 2ND Key
Many scientific functions come in pairs — sin and arcsine, square and cube, square root and cube root. Rather than doubling the number of buttons, this calculator follows the same convention as a physical scientific calculator: press 2ND to temporarily swap a button to its paired function.
2ND + sin → sin⁻¹ (arcsine)
2ND + x² → x³ (cube)
2ND + √x → ³√x (cube root)
How to Use This Calculator
- Set the angle mode with DEG or RAD if you're using trig functions.
- Type your expression using the on-screen keys or your physical keyboard.
- Press Enter or = to evaluate.
- Use M+ to store a result, and MR to bring it back anytime.
- Scroll the history tape above the display to revisit earlier results.
ThinkForU Privacy Guarantee
We believe in keeping tools simple and private. This calculator offers:
- No Login: Start calculating immediately.
- No Data Saved: History lives only in your browser tab and disappears when you close it.
- 100% Free: No limits, no premium tier.
Frequently Asked Questions
Is this scientific calculator free to use?
Yes, completely free with no login, no signup, and no usage limits.
Does it support keyboard input?
Yes. Number keys, operators, Enter for equals, Backspace, and Escape for clear all work directly from your keyboard.
Can I switch between degrees and radians?
Yes, use the Deg/Rad toggle above the display to switch the angle mode used by sin, cos, and tan.
Does the calculator save my calculation history?
History is kept only in your browser tab for the current session and is never saved to a server or sent anywhere.
Conclusion
Whether you're checking homework, working through an engineering problem, or just need a quick logarithm, the ThinkForU Scientific Calculator is built to feel as fast as a physical calculator while living entirely in your browser.