Help Center

About Universal Calculators

Our Calculator Categories

Math & Numbers

• Percentage Calculator — Find percentages quickly
• Plus/Minus Percentage — Add or subtract percentages
• Percentage Change — Calculate increase or decrease
• Scientific Calculator — Advanced math operations
• Fraction Calculator — Add, subtract, multiply fractions
• Average Calculator — Mean, median, mode calculations
• Random Number Generator — Generate random numbers
• Factorial Calculator — Calculate factorials

Finance & Money

• Compound Interest Calculator — See your money grow
• Simple Interest Calculator — Basic interest calculations
• Investment Calculator — Plan your investments
• Loan Calculator — Monthly payment estimates
• CAGR Calculator — Compound Annual Growth Rate
• Discount Calculator — Find sale prices
• Tip Calculator — Split bills easily
• GST/VAT Calculator — Tax calculations
• Margin Calculator — Profit margin analysis
• And more...

Date & Time

• Age Calculator — Calculate exact age
• Date Difference Calculator — Days between dates
• Birthday Calculator — Days until birthday
• Time Zone Converter — Convert between time zones
• Pregnancy Due Date Calculator — Estimate due dates

Health & Fitness

• BMI Calculator — Body Mass Index
• Calorie Calculator — Daily calorie needs
• Body Fat Calculator — Estimate body fat percentage

Home & Lifestyle

• Fuel Cost Calculator — Trip fuel expenses
• Electricity Bill Calculator — Estimate power costs
• Recipe Scaler — Adjust recipe servings
• Shoe Size Converter — International size conversion
• Ring Size Calculator — Find your ring size

Converters & Tools

• Unit Converter — Length, weight, area, volume, and more
• Image Converter — Convert between image formats
• Aspect Ratio Calculator — For images and videos

How to Use Our Calculators

Using our calculators is simple and straightforward:

1. Enter your values — Type your numbers into the input fields provided.

2. Get instant results — Most calculators update in real-time as you type.

3. Copy results — Click the icon to copy results to your clipboard.

4. Rearrange calculators — On pages with multiple calculators, drag the handle to reorder them as you prefer.

5. Reset anytime — Click the button to clear inputs and start fresh.

Key Features

• 100% Free — All calculators are completely free to use, forever.
• No Registration — Start calculating immediately without creating an account.
• Privacy Focused — Your calculations stay on your device. We don't store your data.
• Mobile Friendly — Works perfectly on phones, tablets, and desktops.
• Real-Time Results — See results instantly as you type.
• Customizable Layout — Drag and drop to arrange calculators your way.

Tips for Best Results

• Double-check your inputs for accuracy before using results.
• For financial calculators, results are estimates — consult a professional for important decisions.
• Use decimal points for precise calculations (e.g., 10.5 instead of "10 and a half").
• Bookmark your favorite calculators for quick access.
• Your calculator arrangement preferences are saved in your browser.

Frequently Asked Questions

Is this website free to use?

Yes! All calculators on Universal Calculators are 100% free with no hidden costs.

Do I need to create an account?

No account is needed. Simply visit the site and start calculating immediately.

Is my data secure?

Absolutely. All calculations happen locally in your browser. We don't collect or store your calculation data on our servers.

Why did my calculator arrangement reset?

Your preferences are stored in your browser's cookies. Clearing your browser data or switching browsers/devices will reset your preferences.

Can I suggest a new calculator?

Yes! We love hearing from our users. Send your suggestions to our email below.

Contact Us

We're always working to improve Universal Calculators. Your feedback helps us make better tools for everyone!