The Best Free Calculator Hub
98+ free calculators covering finance, math, health, fitness, and everyday life. No sign-up, no ads, no nonsense.
💰 Finance & Money
24 calculatorsMortgages, investments, retirement, budgeting, and more
Compound Interest
Calculate exponential investment growth with monthly contributions.
Rule of 72
Estimate how long it takes to double your money.
Real Rate of Return
Adjust returns for inflation using the Fisher Equation.
Savings Goal
Find out how much to save monthly to reach your goal.
Inflation Calculator
See how inflation erodes purchasing power over time.
Retirement Calculator
Plan your retirement with the 4% withdrawal rule.
Net Worth Calculator
Calculate your total net worth from assets and liabilities.
Budget Planner
Build a monthly budget and track your savings rate.
50/30/20 Rule
Allocate income across needs, wants, and savings.
Emergency Fund
Calculate how much you need in your emergency fund.
Mortgage Calculator
Monthly payments, total interest, and amortization.
Loan Calculator
Monthly payments for any installment loan.
APR to APY
Convert APR to APY to see the true cost of borrowing.
Debt-to-Income Ratio
Calculate your DTI ratio for loan approval.
Investment Fee Calculator
See how fees erode long-term investment returns.
Mortgage Payment
Full mortgage calculator with PMI, taxes, and insurance.
Retirement Savings
Project savings growth and find your nest egg target.
Inflation Impact
Calculate purchasing power loss across any time period.
Investment Return
Year-by-year investment growth with contributions.
Currency Converter
Convert between 20+ currencies with live rates.
Loan Payoff
See how extra payments reduce your loan term.
Sales Tax
Calculate sales tax for any state or custom rate.
Discount Calculator
Find the final price after any percentage discount.
Compound Interest (Advanced)
Compare compounding frequencies with contributions.
🔢 Math & Numbers
11 calculatorsPercentage, fractions, unit conversion, scientific, and more
Percentage Calculator
Calculate percentages, increases, decreases, and differences.
Scientific Calculator
Full scientific calculator with trig, log, and memory.
Fraction Calculator
Add, subtract, multiply, and divide fractions with steps.
Age Calculator
Calculate exact age in years, months, days, and hours.
Date Calculator
Find the difference between dates or add/subtract days.
Unit Converter
Convert length, weight, temperature, volume, and more.
Tip Calculator
Calculate tip and split the bill among any number of people.
GPA Calculator
Calculate weighted or unweighted GPA from any grades.
Grade Calculator
Calculate weighted or simple average grade for any course.
Speed / Distance / Time
Solve for any variable in the speed, distance, time formula.
Area Calculator
Calculate area for rectangles, circles, triangles, and more.
❤️ Health & Fitness
12 calculatorsBMI, calories, pregnancy, fitness tracking, and more
BMI Calculator
Calculate Body Mass Index with health category and chart.
Calorie Calculator
Calculate daily calorie needs based on your goals.
BMR Calculator
Find your Basal Metabolic Rate and daily energy needs.
Sleep Calculator
Find the best bedtime or wake time based on sleep cycles.
Body Fat Calculator
Estimate body fat percentage using the Navy method.
Pregnancy Due Date
Calculate due date from LMP, conception, IVF, or ultrasound.
Ideal Weight
Find ideal weight using 4 medical formulas.
Ovulation Calculator
Calculate fertile window and ovulation date.
Running Pace Calculator
Calculate pace, finish time, or distance for any race.
Calorie Burn Calculator
Calories burned for 30+ exercises based on your weight.
Macro Calculator
Daily protein, carb, and fat targets for your goals.
Blood Pressure
Check your BP category and track readings over time.
🛠️ Everyday & Utility
10 calculatorsPassword generator, time zones, random numbers, and more
Password Generator
Generate strong, secure passwords with custom settings.
Random Number Generator
Generate random numbers, dice rolls, lottery picks.
Time Zone Converter
Convert times between 20+ world time zones.
Fuel Cost Calculator
Calculate trip fuel cost based on MPG and gas price.
Square Footage
Calculate area of rooms and spaces in square feet.
Concrete Calculator
Calculate concrete needed for slabs, columns, and footings.
Numerology Calculator
Calculate Life Path, Destiny, Soul Urge numbers.
Love Calculator
Calculate love compatibility between two names for fun.
Electricity Cost
Calculate your monthly electricity bill by appliance.
Zodiac Sign Calculator
Find your zodiac sign, element, and compatibility.
📐 Math & Science
3 calculatorsStatistics, triangles, number bases, and advanced math tools
💪 Nutrition & Wellness
2 calculatorsWater intake, protein, macros, and daily wellness calculators
📊 Business & Investing
12 calculatorsStock returns, break-even, profit margins, paycheck, and more
Stock Return Calculator
Calculate ROI and annualized return on any stock investment.
Break-Even Calculator
Find how many units to sell to cover all costs.
Rent vs. Buy Calculator
Compare true cost of renting vs buying over any time period.
Profit Margin Calculator
Gross, operating, and net profit margins for any business.
Paycheck Calculator
Take-home pay after federal, state taxes, and deductions.
Auto Loan Calculator
Monthly car payment, total interest, and amortization.
Savings Interest Calculator
Calculate how much interest your savings will earn.
Credit Card Payoff
See how long to pay off your credit card and total interest.
Business Loan Calculator
Monthly payments and total cost for a business loan.
ROI Calculator
Calculate return on investment and annualized CAGR.
Tax Bracket Calculator
2024 federal income tax breakdown by bracket.
College Savings Calculator
Plan how much to save for your child's college education.
🔣 Advanced Math
8 calculatorsAlgebra, geometry, logarithms, and more
Algebra Calculator
Solve linear and quadratic equations step by step.
Geometry Calculator
Area, perimeter, and volume for all common shapes.
Roman Numeral Converter
Convert between Roman numerals and standard numbers.
Average Calculator
Mean, median, mode, and range for any set of numbers.
Ratio Calculator
Simplify ratios and solve proportion problems.
Factor Calculator
Find all factors, prime factors, GCF, and LCM.
Exponent Calculator
Calculate powers, roots, and scientific notation.
Log Calculator
Logarithm, natural log, and log base calculations.
🏠 Home & Construction
5 calculatorsRoofing, flooring, paint, tile, and more
Roofing Calculator
Estimate roofing materials and cost for any roof.
Flooring Calculator
Calculate flooring materials needed for any room.
Paint Calculator
How many gallons of paint you need for any room.
Gravel Calculator
Calculate gravel, sand, or mulch volume and weight.
Tile Calculator
Estimate tiles needed for floors, walls, or backsplash.
🐾 Fun & Lifestyle
5 calculatorsPet age, cooking, clothing, color tools, and more
Dog Age Calculator
Convert your dog's age to human years by breed size.
Cat Age Calculator
Convert your cat's age to human years.
Cooking Converter
Convert cups, tablespoons, ounces, grams and more.
Clothing Size Converter
Convert clothing sizes between US, UK, EU, and Asia.
Color Converter
Convert between HEX, RGB, HSL, and CMYK color formats.
👶 Child & Family Health
6 calculatorsGrowth, development, and family planning tools
Target Heart Rate
Find your ideal heart rate zones for cardio exercise.
Lean Body Mass
Calculate your lean muscle mass and fat mass.
Period Tracker
Track your menstrual cycle and predict future periods.
Height Percentile
Find height percentile for children by age and gender.
Weight Percentile
Find weight percentile for children by age and gender.
Child Height Predictor
Predict your child's adult height based on parent heights.
Want to Understand the Math?
Our in-depth guides explain the formulas, concepts, and strategies behind each calculator.