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Free Online Calculators: BMI, Mortgage, Loan, Currency, Age & More
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42+ Free Calculators · No Signup · Instant Results

Online Calculators — Health, Finance, Math & Everyday Tools

Complete collection of free online calculators. Calculate BMI, mortgage payments, loan interest, currency conversion, age, date differences, tip amounts, fuel costs, GPA, retirement savings, and more. All calculators work instantly in your browser.

42+
Calculators
12
Categories
∞
Free Forever
All Calculators Health Finance Math Time & Age Conversion Lifestyle Construction

Basic Calculator

Simple arithmetic operations: add, subtract, multiply, divide. Perfect for everyday calculations.

Arithmetic
567K+ uses

Scientific Calculator

Advanced functions: trigonometry, logarithms, exponents, and more for complex calculations.

Advanced
234K+ uses

Percentage Calculator

Calculate percentages, discounts, tips, and more. Find percentage increases and decreases.

Percent
345K+ uses

BMI Calculator

Calculate Body Mass Index and ideal weight range. Get health insights based on your measurements.

Health
789K+ uses

Loan Calculator

Calculate monthly payments, total interest, and loan terms. Compare different loan options.

Finance
456K+ uses

Mortgage Calculator

Estimate monthly mortgage payments with interest, taxes, and insurance included.

Real Estate
567K+ uses

Currency Converter

Convert between world currencies with live exchange rates. Supports 150+ currencies.

Exchange
678K+ uses

Unit Converter

Convert length, weight, volume, temperature, area, speed, and more. 50+ unit types.

Measurement
345K+ uses

Age Calculator

Calculate exact age in years, months, weeks, days, hours, and minutes.

Birthday
456K+ uses

Date Calculator

Add or subtract days from a date. Calculate duration between two dates.

Calendar
234K+ uses

Time Calculator

Add, subtract, and convert time units. Calculate hours worked and time durations.

Hours
123K+ uses

Tip Calculator

Calculate tip amount and split bill among friends. Choose tip percentage and round options.

Dining
345K+ uses

Fuel Cost Calculator

Estimate fuel cost for trips and commute. Calculate based on distance, fuel efficiency, and price.

Travel
123K+ uses

GPA Calculator

Calculate grade point average for semesters. Supports weighted and unweighted GPA.

Education
89K+ uses

Discount Calculator

Calculate sale prices and savings percentage. Find final price after discounts.

Shopping
234K+ uses

Sales Tax Calculator

Calculate sales tax, VAT, and total price. Supports different tax rates.

Tax
167K+ uses

Retirement Calculator

Plan retirement savings and future income. Estimate how much you need to save.

Planning
98K+ uses

Investment Calculator

Calculate returns on investments and compound interest. Project future value.

Growth
134K+ uses

Calorie Calculator

Calculate daily calorie needs for weight goals. Based on age, height, weight, and activity.

Fitness
156K+ uses

Pregnancy Calculator

Estimate due date and pregnancy timeline. Track trimester progress.

Parenting
87K+ uses

Ovulation Calculator

Track fertile window and ovulation dates. Plan for pregnancy or contraception.

Health
76K+ uses

Concrete Calculator

Calculate concrete volume for slabs, columns, footings, and stairs.

Construction
65K+ uses

Roofing Calculator

Estimate roofing materials and costs. Calculate shingles, underlayment, and labor.

Home
43K+ uses

Paint Calculator

Estimate paint needed for rooms and walls. Calculate gallons based on wall area.

DIY
54K+ uses

Salary Calculator

Convert hourly wage to annual salary. Calculate overtime and take-home pay.

Income
89K+ uses

Time Card Calculator

Calculate work hours, overtime, and breaks. Track employee time cards.

Work
67K+ uses

Overtime Calculator

Calculate overtime pay based on regular rate and overtime hours.

Payroll
45K+ uses

VAT Calculator

Add or remove VAT from prices. Calculate net and gross amounts.

Tax
78K+ uses

GST Calculator

Calculate Goods and Services Tax. Add or remove GST from prices.

Tax
56K+ uses

Simple Interest Calculator

Calculate simple interest on loans and investments.

Interest
67K+ uses

Compound Interest Calculator

Calculate compound interest with regular contributions.

Investment
89K+ uses

Auto Loan Calculator

Calculate car loan payments, interest, and total cost.

Vehicle
123K+ uses

Credit Card Calculator

Calculate credit card payments, interest, and payoff time.

Debt
98K+ uses

Budget Calculator

Create a personal budget. Track income and expenses.

Planning
76K+ uses

Savings Calculator

Project savings growth over time with regular deposits.

Goals
65K+ uses

Inflation Calculator

Calculate the effects of inflation on purchasing power.

Economy
34K+ uses

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin.

Weather
145K+ uses

Weight Converter

Convert between kg, lbs, ounces, grams, and more.

Mass
134K+ uses

Length Converter

Convert between meters, feet, inches, miles, kilometers, and more.

Distance
112K+ uses

Volume Converter

Convert between liters, gallons, cups, ounces, and more.

Liquid
98K+ uses

Speed Converter

Convert between mph, km/h, knots, m/s, and more.

Velocity
67K+ uses

Area Converter

Convert between square meters, acres, hectares, square feet, and more.

Land
56K+ uses

Power Converter

Convert between watts, kilowatts, horsepower, BTU/hour, and more.

Energy
34K+ uses

Pressure Converter

Convert between psi, bar, pascal, atm, torr, and more.

Force
23K+ uses

Most Popular Calculators

BMI Calculator Mortgage Loan Currency Age Percentage

Frequently Asked Questions

Are these calculators really free?
Yes, all 42+ calculators are completely free with no hidden fees, no signup required, and no usage limits. Use them as much as you want.
How accurate are the financial calculators?
Our financial calculators use standard formulas and provide accurate estimates. Currency converters use live exchange rates updated regularly.
Can I use these calculators on mobile?
Yes, all calculators are fully mobile-responsive and work perfectly on smartphones and tablets. No app download needed.
Do I need to create an account?
No account or signup required. You can start using any calculator immediately without registration.
How often are currency rates updated?
Currency exchange rates are updated multiple times daily from reliable financial data sources.
Can I save my calculations?
You can bookmark any calculator or print the results. We don't store your data to protect your privacy.

Complete Collection of Free Online Calculators

Our comprehensive suite of online calculators provides everything you need for health, finance, mathematics, conversions, and everyday calculations. Whether you're planning a mortgage, tracking your fitness, converting currencies, or calculating tips, we have the perfect calculator for your needs. All calculators work instantly in your browser with no downloads or signups required.

Health & Fitness Calculators

  • BMI Calculator: Body Mass Index and ideal weight
  • Calorie Calculator: Daily calorie needs for weight goals
  • Pregnancy Calculator: Due date and pregnancy timeline
  • Ovulation Calculator: Fertile window tracking

Financial Calculators

  • Mortgage Calculator: Monthly payment estimates
  • Loan Calculator: Payments, interest, and loan terms
  • Retirement Calculator: Plan your retirement savings
  • Investment Calculator: Returns and compound interest
  • Auto Loan Calculator: Car payment estimates
  • Credit Card Calculator: Payoff time and interest
  • Salary Calculator: Hourly to annual conversion
  • Sales Tax Calculator: VAT, GST, and sales tax

Math & Basic Calculators

  • Basic Calculator: Simple arithmetic operations
  • Scientific Calculator: Advanced math functions
  • Percentage Calculator: Discounts, tips, and percentages
  • GPA Calculator: Grade point average

Time & Age Calculators

  • Age Calculator: Exact age in years, months, days
  • Date Calculator: Add/subtract days, date duration
  • Time Calculator: Add/subtract time units
  • Time Card Calculator: Work hours and overtime

Conversion Calculators

  • Currency Converter: Live exchange rates
  • Unit Converter: Length, weight, volume, temperature
  • Temperature Converter: Celsius, Fahrenheit, Kelvin
  • Weight Converter: kg, lbs, ounces, grams
  • Length Converter: meters, feet, inches, miles

Lifestyle & Construction

  • Tip Calculator: Split bills and calculate tips
  • Fuel Cost Calculator: Trip fuel expenses
  • Concrete Calculator: Volume for slabs and columns
  • Roofing Calculator: Material estimates
  • Paint Calculator: Paint needed for rooms

All calculators work directly in your browser — no downloads, no installations, and no data collection. Your privacy is guaranteed because all calculations happen locally on your device. Start calculating now, completely free!

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