Free Online Tools & Calculators
Explore free online calculators and practical tools for math, finance, health and fitness, date and time, unit conversions and everyday tasks. Each tool is designed to provide clear results directly in your browser.
Math & Advanced Calculators
Percentage Calculator
Calculate percentages quickly and easily.
Average Calculator
Calculate average, sum, minimum and maximum.
Fraction Calculator
Add, subtract, multiply and divide fractions.
Ratio Calculator
Simplify and calculate ratios.
GCD & LCM Calculator
Find the greatest common divisor and least common multiple.
Prime Number Checker
Check whether a number is prime.
Random Number Generator
Generate random numbers within a selected range.
Percentage Increase & Decrease
Calculate percentage increases and decreases.
Number to Words
Convert numbers into English words.
Proportion Calculator
Solve proportions and find missing values.
Scientific Calculator
Perform advanced mathematical calculations.
Exponent Calculator
Calculate powers and exponents.
Square Root Calculator
Calculate square roots quickly.
Number Calculator
Perform useful calculations with numbers.
Finance Calculators
Simple Interest Calculator
Calculate simple interest and total amount.
Compound Interest Calculator
Calculate compound interest and investment growth.
Mortgage Calculator
Estimate mortgage payments and total interest.
Loan Calculator
Estimate loan payments and repayment costs.
Savings Calculator
Estimate savings growth over time.
Investment Calculator
Estimate investment growth and returns.
Sales Tax Calculator
Calculate sales tax and final purchase prices.
ROI Calculator
Calculate return on investment.
Inflation Calculator
Estimate the effect of inflation on money values.
Commission Calculator
Calculate commission amounts and earnings.
Break-Even Calculator
Calculate the sales level needed to break even.
Markup Calculator
Calculate markup percentage and selling price.
Profit Margin Calculator
Calculate profit margins and profit amounts.
Debt-to-Income Ratio Calculator
Calculate your debt-to-income ratio.
Credit Card Payoff Calculator
Estimate payoff time and interest costs.
Salary Calculator
Calculate salary and income amounts.
Hourly to Salary Calculator
Convert hourly pay into annual salary.
Salary to Hourly Calculator
Convert annual salary into hourly pay.
Percentage of Salary Calculator
Calculate percentages of your salary.
Tip Calculator
Calculate tips and split bills between people.
Discount Calculator
Calculate discounts, savings and final prices.
Health & Fitness Calculators
BMI Calculator
Calculate Body Mass Index using height and weight.
BMR Calculator
Estimate your Basal Metabolic Rate.
Calorie Calculator
Estimate daily calorie requirements.
Ideal Weight Calculator
Estimate ideal body weight based on height.
Water Intake Calculator
Estimate daily water intake.
Body Fat Calculator
Estimate body fat percentage.
Macro Calculator
Estimate daily macronutrient requirements.
Protein Calculator
Estimate daily protein requirements.
Pace Calculator
Calculate running and walking pace.
Pregnancy Calculator
Estimate pregnancy dates and due date.
Date & Time Calculators
Age Calculator
Calculate your exact age from your date of birth.
Date Calculator
Calculate dates and date differences.
Days Between Dates Calculator
Calculate the number of days between two dates.
Date Add/Subtract Calculator
Add or subtract days, weeks, months and years.
Time Zone Converter
Convert times between different time zones.
Time Calculator
Add, subtract, multiply and divide time values.
Unit & Conversion Tools
Unit Converter
Convert common measurement units.
Length Converter
Convert meters, kilometers, miles, feet, inches and more.
Weight Converter
Convert kilograms, grams, pounds, ounces and more.
Temperature Converter
Convert Celsius, Fahrenheit and Kelvin.
Area Converter
Convert square meters, acres, hectares and more.
Volume Converter
Convert liters, gallons, cups and other volume units.
Speed Converter
Convert km/h, mph, m/s, knots and more.
Pressure Converter
Convert Pa, kPa, bar, psi, atm and other pressure units.
Energy Converter
Convert joules, calories, kWh, BTU and more.
Data Storage Converter
Convert bits, bytes, KB, MB, GB, TB and binary units.
Other Useful Tools
Password Generator
Create strong random passwords.
Word Counter
Count words, characters and text length.
About Our Online Calculators
Easy Online Tool provides a collection of free calculators and utilities designed for everyday use. Our tools cover mathematics, finance, health and fitness, dates and time, unit conversions and other common tasks.
Each calculator is designed to work directly in a modern web browser without requiring additional software. Depending on the tool, results are calculated using standard mathematical formulas or commonly used calculation methods.
Calculator results are provided for general informational purposes. For important financial, health or other decisions, users should verify results with an appropriate qualified professional.