Online Calculator Tools
Professional-grade calculators for everyday math, percentages, and business calculations. Fast, accurate results with step-by-step explanations. All tools are free and work instantly in your browser.
Available Calculators (21)
Percentage Calculator
Calculate percentages, percentage increase/decrease, and percentage of total.
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes from birth date.
BMI Calculator
Calculate your Body Mass Index (BMI) and check your health category instantly.
Loan Calculator
Calculate monthly loan payments, total interest, and amortization schedules.
Mortgage Calculator
Calculate mortgage payments with taxes, insurance, and PMI included.
Tip Calculator
Calculate tips and split bills among friends quickly and accurately.
Discount Calculator
Calculate discounts, final prices, and savings on sale items.
Calorie Calculator
Calculate daily calorie needs based on age, weight, height, and activity level.
ROI Calculator
Calculate return on investment for business and personal investments.
Compound Interest Calculator
Calculate compound interest and see your investment growth over time.
Date Calculator
Calculate days between dates, add or subtract days, and find future dates.
Fuel Cost Calculator
Calculate fuel costs for trips based on distance, fuel price, and efficiency.
Grade Calculator
Calculate final grades based on assignments, tests, and weighted categories.
Time Calculator
Add, subtract, and calculate time durations in hours, minutes, and seconds.
Square Footage Calculator
Calculate square footage for rooms, properties, and construction projects.
VAT Calculator
Calculate VAT (Value Added Tax) including or excluding VAT from prices.
Percent Off Calculator
Calculate final price after percentage discount and savings amount.
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions.
Area Calculator
Calculate area for rectangles, circles, triangles, and other shapes.
Volume Calculator
Calculate volume for cubes, cylinders, spheres, and other 3D shapes.
Pace Calculator
Calculate running pace, speed, and time for distances like 5K, 10K, marathon.
Why Use Our Calculators?
Instant Calculations
All calculations happen instantly in your browser. No page reloads, no delays, just immediate accurate results.
Step-by-Step Solutions
See how calculations are performed with detailed explanations. Perfect for learning and verifying results.
Multiple Calculation Modes
Each calculator offers multiple modes to solve different types of problems. Find what you need quickly.
Real-World Applications
Designed for practical use in business, finance, shopping, education, and everyday calculations.
Common Use Cases
🛍️ Shopping & Discounts
Calculate sale prices, discounts, and savings. Figure out the final price after percentage-off deals.
💼 Business & Finance
Calculate profit margins, growth rates, ROI, and financial metrics for business decisions.
🎓 School & Homework
Solve math problems, verify homework answers, and understand percentage calculations step-by-step.
💰 Tips & Gratuity
Quickly calculate restaurant tips, service charges, and split bills among friends.
📊 Statistics & Data
Calculate percentage changes, growth rates, and statistical proportions for reports and analysis.
🏦 Loans & Interest
Figure out interest rates, loan amounts, and percentage-based financial calculations.
Percentage Calculator Guide
What is X% of Y?
Example: What is 20% of 150?
Solution: (20 ÷ 100) × 150 = 30
Use for: Calculating discounts, tips, commission
X is what % of Y?
Example: 30 is what % of 150?
Solution: (30 ÷ 150) × 100 = 20%
Use for: Finding percentage proportions
X is Y% of what?
Example: 30 is 20% of what?
Solution: 30 ÷ (20 ÷ 100) = 150
Use for: Finding the original amount
Percentage Increase
Example: Increase 100 by 20%
Solution: 100 + (100 × 20 ÷ 100) = 120
Use for: Price increases, growth calculations
Percentage Decrease
Example: Decrease 100 by 20%
Solution: 100 - (100 × 20 ÷ 100) = 80
Use for: Discounts, price reductions
Percentage Change
Example: From 100 to 120
Solution: ((120 - 100) ÷ 100) × 100 = 20%
Use for: Growth rate, change over time
Frequently Asked Questions
How do I calculate percentage?
To calculate percentage, divide the part by the whole and multiply by 100. For example: (25 ÷ 100) × 100 = 25%. Our calculator does this instantly for you.
What's the difference between percentage and percentile?
A percentage is a proportion out of 100, while a percentile indicates a value's position relative to a dataset. Our percentage calculator handles percentage calculations.
How do I calculate a discount?
To find the sale price, calculate the discount amount (original price × discount percentage ÷ 100) and subtract it from the original price. Use our "decrease by percentage" mode.
Can I calculate multiple percentages?
Yes! You can use the calculator as many times as needed. Each calculation is independent and instant.
Are the calculator results accurate?
Yes, our calculators use precise mathematical formulas and JavaScript's built-in math functions for accurate results every time.
Do you store my calculations?
No. All calculations happen locally in your browser. We don't collect, store, or transmit any of your calculation data.