Free Online Calculators — Mortgage, BMI, Tax & 99+ Tools
Instantly calculate mortgage payments, BMI, compound interest, salary, tax, and more. 99+ free online calculators for finance, health & math — no signup, no download, works on any device.
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Works Everywhere
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Results Explained
Every answer comes with a plain-English breakdown so you understand the numbers.
📐 Math Calculators
Percentage Calculator
Calculate percentages, increases, and decreases
Area Calculator
Calculate area of geometric shapes
Volume Calculator
Calculate volume of 3D shapes
Triangle Calculator
Calculate triangle properties and measurements
Scientific Calculator
Advanced calculator with scientific functions
Average Calculator
Calculate mean, median, and mode of numbers
Standard Deviation Calculator
Calculate standard deviation and variance
Fraction Calculator
Add, subtract, multiply, and divide fractions
Unit Converter
Convert between different units of measurement
Binary Converter
Convert between binary, decimal, hex, and octal
Ratio Calculator
Simplify and compare ratios
Proportion Calculator
Solve for unknown values in proportions
Probability Calculator
Calculate likelihood of single and multiple events
Quadratic Equation Solver
Solve ax² + bx + c = 0 instantly
Variance Calculator
Find variance for any set of numbers
🎓 Education Calculators
GPA Calculator
Calculate your Grade Point Average
CGPA Calculator
Calculate your Cumulative Grade Point Average
Grade Calculator
Calculate grades and letter grades
Study Time Calculator
Estimate how many hours to study for any exam
Reading Time Calculator
Find out how long it takes to read any text
Attendance Calculator
Check if you meet minimum attendance requirements
🏥 Health & Fitness Calculators
BMI Calculator
Calculate your Body Mass Index
BMR Calculator
Calculate your Basal Metabolic Rate
TDEE Calculator
Total Daily Energy Expenditure based on activity level
Calorie Calculator
Calculate your daily calorie needs
Macro Calculator
Calculate daily protein, carbs, and fat targets
Protein Calculator
Find your daily protein intake recommendation
Water Intake Calculator
Calculate your daily water needs
Body Fat Calculator
Estimate body fat percentage using measurements
Ideal Weight Calculator
Calculate your ideal body weight
Lean Body Mass Calculator
Estimate fat-free body mass
Heart Rate Zone Calculator
Find your target heart rate zones for exercise
Sleep Calculator
Find the best time to wake up based on sleep cycles
Running Pace Calculator
Calculate running pace and race times
Due Date Calculator
Estimate your baby's due date
Pregnancy Calculator
Calculate due date and pregnancy milestones
Ovulation Calculator
Predict your most fertile days and ovulation date
💰 Financial Calculators
Mortgage Calculator
Calculate mortgage payments and amortization
Compound Interest Calculator
Calculate compound interest and investment growth
Simple Interest Calculator
Calculate simple interest on loans and investments
EMI Calculator
Calculate Equated Monthly Installments
Car Loan Calculator
Calculate car loan payments and total cost
Personal Loan Calculator
Calculate payments for any personal loan
Student Loan Calculator
Plan your student loan repayment
Credit Card Payoff Calculator
Find out how long to pay off credit card debt
Debt Snowball Calculator
Build a plan to eliminate multiple debts
Savings Calculator
Plan how to reach any savings goal
APY Calculator
Find the true annual yield on savings accounts
APR Calculator
Find the true annual cost of any loan
FIRE Calculator
Calculate your Financial Independence number
Investment ROI Calculator
Calculate return on investment percentage
Retirement Calculator
Plan for retirement savings and goals
Amortization Calculator
Calculate loan amortization schedules
Payment Calculator
Calculate loan payments and terms
Inflation Calculator
Calculate inflation impact on money
Tax Calculator
Estimate your tax liability
Salary After Tax Calculator
Calculate take-home salary after taxes
Sales Tax Calculator
Calculate sales tax and total prices
Discount Calculator
Calculate discounts and final prices
Tip Calculator
Calculate tips and split bills
Fuel Cost Calculator
Calculate fuel costs and trip expenses
Currency Converter
Convert between different currencies
🔧 Utility & Conversion Tools
Age Calculator
Calculate your exact age in years, months, and days
Date Difference Calculator
Calculate days between any two dates
Time Calculator
Add, subtract, and convert time values
Hours Calculator
Calculate hours worked and time differences
Cooking Converter
Convert cups, tablespoons, grams, oz, and more
Electricity Bill Calculator
Estimate monthly electricity cost by appliance
Trip Cost Calculator
Estimate total fuel and travel costs for any journey
QR Code Generator
Generate QR codes for URLs, text, WiFi, and more
Password Generator
Generate secure passwords with custom options
Random Number Generator
Generate random numbers and sequences
Subnet Calculator
Calculate IP subnets and network addresses
Love Calculator
Test your romantic compatibility percentage
💼 Business Calculators
Profit Margin Calculator
Calculate gross, operating, and net profit margins
Markup Calculator
Find selling price from cost and markup percentage
Break-Even Calculator
Find the sales volume needed to cover all costs
Gross Profit Calculator
Calculate gross profit and margin
Payroll Calculator
Calculate gross-to-net pay and employer costs
Pricing Calculator
Set prices based on cost, margin, or markup goals
Inventory Calculator
Calculate EOQ, reorder points, and inventory value
🏗️ Construction Calculators
Paint Calculator
How many gallons of paint to cover any room or surface
Tile Calculator
Calculate tile quantity and cost including waste
Flooring Calculator
Estimate flooring materials needed for any room
Brick Calculator
Calculate bricks needed for any wall or project
Gravel Calculator
Estimate gravel, sand, and aggregate quantities
Roofing Calculator
Estimate roofing shingles and materials needed
Drywall Calculator
Calculate drywall sheets for walls and ceilings
Concrete Calculator
Calculate concrete volume for slabs and footings
Square Footage Calculator
Calculate area of rooms and spaces
🆕 Recently Added
New tools added July 2026 — expanding our collection to 99+ calculators.
Browse All 99+ Calculators
Our complete collection of free online calculators — organized alphabetically for quick access.
🌍 Calculators by Country
Calculators tailored for your local currency, taxes, and conventions.