Free Online Calculator - Basic & Scientific

Simple Online Calculator Uses Guide: Step by Step 

• Type numbers and operators (+, −, ×, ÷) using your keyboard or the on-screen keys.

• Press = or Enter to evaluate instantly.

• Use AC to clear everything, CE to delete the last input, and ± to switch sign.

• Click Copy to copy the current result in one click.

Example: Type 45 × 3 + 9, then press = to see the result immediately.

Basic Mode — Everyday Calculations

• Add, subtract, multiply, and divide

• Percent and decimal operations

• Switch signs (positive ⇄ negative)

• Clear an entry with a single click

Basic mode is clean, minimal, and distraction-free — ideal for budgeting, bills, or quick arithmetic in class or at work.

Scientific Mode — Advanced Functions

Turn on Scientific to unlock extra keys. If you prefer a dedicated page, try our standalone scientific calculator (link: /scientific-calculator).

What you can do:

• Trigonometry: sin, cos, tan (toggle DEG/RAD)

• Logarithms & powers: log, ln, x², x³, x^y

• Roots: √ (square root), ∛ (cube root)

• Constants: π, e

• Memory: MC, MR, M+, M−

Pro tip: Use keyboard shortcuts — “/” for ÷, “*” for ×, “^” for power, and Enter for =.

Why People Love This Calculator

• No download or login required

• Works beautifully on desktop, tablet, and mobile

• Switch between Basic ↔ Scientific instantly

• Privacy-friendly — nothing is saved or shared

• Copy results in a click

Features at a Glance

• Dual mode (Basic + Scientific)

• Lightweight and fast, with optional AMP support

• Accessible controls and a clear, large display

• Keyboard support and copy-to-clipboard

Pros and Cons

Pros

• Fast, accurate calculations

• Works on all modern browsers

• Mobile-friendly and responsive

• Scientific tools built in — no separate app

• Instant result copy

• Simple, modern interface

Cons

• No graph plotting

• No formula history (by design for privacy)

• Offline mode limited to the current session

Explore more tools like the online alarm clock or the time converter to boost productivity.

Conclusion

The Time of Info Free Online Calculator is more than a basic tool — it’s your go-to problem-solver. Whether you’re balancing a budget, preparing for exams, or checking engineering expressions, it adapts to your needs instantly. Try it now: switch between Basic and Scientific, explore the extra features, and make every calculation faster and easier.