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Free Online Calculator & Scientific Calculator
History
Financial Calculators
Mortgage Calculator
Calculate monthly mortgage payments based on loan details
Loan Calculator
Determine loan payments and total interest for various loans
Interest Calculator
Calculate simple and compound interest on savings
Retirement Calculator
Plan for retirement and estimate savings needs
Investment Calculator
Calculate investment returns and portfolio growth
Sales Tax Calculator
Calculate sales tax and final purchase price instantly
Math Calculators
Scientific Calculator
Solve advanced math easily with trigonometric, logarithmic, power, and root functions
Fraction Calculator
Add, subtract, multiply, and divide fractions easily
Percentage Calculator
Calculate percentages, discounts, and percentage changes
Triangle Calculator
Calculate triangle properties, area, and sides
GPA Calculator
Calculate your Grade Point Average automatically
Random Number Generator
Generate random numbers within a specified range
Health & Fitness Calculators
BMI Calculator
Calculate your Body Mass Index and check health status
Calorie Calculator
Determine daily calorie needs based on activity level
Body Fat Calculator
Estimate your body fat percentage accurately
BMR Calculator
Calculate your Basal Metabolic Rate for weight management
Ideal Weight Calculator
Determine your ideal weight based on height and age
Pace Calculator
Calculate running or walking pace and distance
Other Calculators & Tools
Age Calculator
Calculate your exact age in years, months, and days
Date Calculator
Calculate days between dates and future dates
Love Calculator
Calculate love compatibility percentage with your partner
Time Calculator
Add, subtract, and convert time durations
Hours Calculator
Calculate work hours and overtime easily
Conversion Calculator
Convert between various units and measurements
Password Generator
Generate secure passwords with customizable options
Features of Our Free Online 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
Is this online scientific calculator completely free?
Yes! Our basic and scientific calculators are 100% free to use. 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.
How do I calculate percentages on a calculator?
To calculate a percentage, enter your base number, press the multiply (×) button, enter the percentage amount, and press the percentage (%) button followed by equals. For example: 50 × 20 % = 10.
How accurate are the scientific calculations?
Our online scientific calculator uses robust JavaScript math libraries, ensuring high precision (up to 15 decimal places) for trigonometry, logarithms, and exponential functions, adhering to standard mathematical order of operations (PEMDAS/BODMAS).