40+ Free Calculators for Math & Life

Process your numbers 100% Client-Side. Fast, Secure, Mobile-Friendly, and completely Free. Part of iLoveTools platform.

Financial Calculators

Mortgage

Calculate monthly payments with tax & insurance

Loan / Auto

Estimate personal or car loan monthly costs

Simple Interest

Calculate accumulated simple interest over time

Compound Interest

Visualize investment growth with compounding

ROI Calculator

Calculate percentage Return on Investment

Salary Converter

Convert Hourly wage to Yearly salary

Inflation

Estimate future value of money based on rates

Sales Tax

Calculate final total with sales tax included

Discount

Calculate savings from sale prices

Tip Calculator

Split bills and calculate tips easily

Health & Fitness

BMI Calculator

Check your Body Mass Index score

Calorie (TDEE)

Find your daily energy expenditure needs

Body Fat %

Estimate body fat using US Navy method

Ideal Weight

Find your healthy weight range

Water Intake

Calculate daily hydration goals

Due Date

Pregnancy due date estimator

Age Calculator

Calculate your precise age from DOB

Math & Utilities

Scientific Calc

Advanced math operations and square roots

Percentage

Find percentages of numbers easily

Circle Calc

Calculate Area & Circumference from Radius

Right Triangle

Find the Hypotenuse length

Number Gen

Random number picker within a range

Password Gen

Create strong, secure random strings

Concrete Volume

Calculate Cubic Yards for construction

Fuel Cost

Estimate trip cost based on MPG

Converters

Length

Meters, Feet, Inches conversion

Weight

Kilograms to Pounds converter

Temperature

Celsius & Fahrenheit switch

Speed

MPH and KPH conversion

Free Online Calculators for Every Need

Financial Calculators

Our financial calculators help with mortgage payments, loan calculations, interest rates, ROI analysis, salary conversions, and investment planning. Whether you're buying a home, planning investments, or managing personal finances, these tools provide accurate calculations without sharing your data.

Health & Fitness Calculators

Track your health with our BMI calculator, calorie needs estimator, body fat percentage, ideal weight range, water intake requirements, pregnancy due dates, and age calculator. All health calculations are performed locally for complete privacy.

Math & Utility Calculators

From scientific calculations and percentage problems to geometry, random number generation, password creation, construction estimates, and fuel cost calculations. Essential tools for students, professionals, and everyday use.

Unit Converters

Quickly convert between length units (meters, feet, inches), weight measurements (kg, lbs), temperature scales (Celsius, Fahrenheit), and speed units (MPH, KPH). Perfect for international users and unit conversions.

Frequently Asked Questions

Are these calculators really free?

Yes, all 40+ calculators are completely free with no hidden charges, registration requirements, or usage limits. We believe in providing accessible tools for everyone.

Is my data secure with these calculators?

Absolutely. All calculations happen 100% in your browser. Your financial data, health information, and personal inputs never leave your device. No server processing means complete privacy.

Do these calculators work on mobile devices?

Yes, all calculators are fully responsive and work perfectly on smartphones, tablets, and desktop computers. The interface adapts to your screen size for optimal usability.

Can I use these calculators offline?

Once loaded in your browser, most calculators will work offline since they use client-side JavaScript. However, initial page load requires internet connection.

Looking for Document Tools?

Check out our PDF Tools section featuring 12 essential document utilities including PDF merging, splitting, compression, conversion, watermarking, and encryption. All tools work 100% client-side for maximum security.