Free Online Calculator & Scientific Calculator

Welcome to US Calculator Pro, your go-to destination for fast and reliable math solutions. Our primary tools—the Basic Calculator and Scientific Calculator—are designed to handle everything from everyday arithmetic to complex academic equations directly in your browser without requiring any downloads or registration.

Basic Math Solver: Instantly add, subtract, multiply, and divide. Perfect for quick budgeting and accounting.
Scientific Calculator Online: Equipped with advanced functions including Trigonometry (sin, cos, tan), Logarithms, Exponents, Fractions, and root calculations.
Memory Functions (MC, MR, M+, M-): Store values temporarily to solve multi-step equations easily.
Live Calculation History: Never lose track of your work. View, copy, or print your past calculations directly from the history panel.
Mobile-Optimized Design: Enjoy a fullscreen, native app-like experience on your smartphone or tablet.

Frequently Asked Questions (US Audience)

Is this online scientific calculator completely free in the US?

Yes! Our basic and scientific calculators are 100% free to use for all users across the United States and globally. There are no hidden fees, subscriptions, or registration required to access any of our advanced math tools.

How do I use the memory buttons (MC, MR, M+, M-, MS)?

MS (Memory Store) saves the current number. M+ (Memory Add) adds the current number to the saved value. M- (Memory Subtract) subtracts it. MR (Memory Recall) brings the saved number back to the screen, and MC (Memory Clear) deletes it.

Does the calculator keep a history of my equations?

Yes. Every time you press the equals (=) button, your complete equation and the result are saved in the built-in History Panel. You can clear or print this history at any time for your records or homework.

How do I calculate percentages for sales tax or tips?

To calculate a percentage (perfect for calculating US state sales tax or restaurant tips), enter your base amount, press the multiply (×) button, enter the percentage amount, and press the percentage (%) button followed by equals. For example, for a 20% tip on $50: 50 × 20 % = 10.

Are the scientific calculations using American math standards?

Yes. Our online scientific calculator uses standard mathematical order of operations (PEMDAS/BODMAS) commonly taught in US schools, ensuring high precision (up to 15 decimal places) for trigonometry, logarithms, and exponential functions.

Is my calculation data private?

Absolutely. US Calculator Pro runs entirely in your local browser window. None of your math equations, financial numbers, or health metrics are ever sent to our servers. Your data is 100% private and secure.