Finance
Compound Interest Calculator
Project investment growth with compounding and regular contributions.
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Every calculation, made clearer.
Calculate Smarter. Make Better Decisions.
Free, practical calculators with the formula, an example, and the context you need to use the result well.
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01 / Quick access
Quick access
Jump straight to the tools people reach for most.
02 / Popular calculators
View all 50Popular calculators
Useful answers for everyday money, health, study, and planning questions.
Finance
Loan Calculator
Estimate periodic loan payments, total repayment, and interest.
Open calculatorFinance
Mortgage Calculator
Estimate monthly mortgage payments and optional housing costs.
Open calculatorFinance
Salary Calculator
Convert hourly, weekly, monthly, and annual gross pay.
Open calculatorFinance
Currency Converter
Convert currencies with optional daily rates or your own rate.
Open calculatorShopping & Daily Life
Discount Calculator
Calculate savings and final price with one or two discounts.
Open calculatorAge, Date & Time
Age Calculator
Find an exact age in years, months, days, and total days.
Open calculatorAge, Date & Time
Date Difference Calculator
Count days, weeks, months, and years between two dates.
Open calculator03 / Categories
Browse by category
Eight focused collections, fifty working calculators.
Finance
Plan loans, savings, investments, income, and long-term goals.
9 calculatorsAge, Date & Time
Measure ages, date intervals, durations, countdowns, and time zones.
5 calculatorsHealth & Fitness
Estimate everyday health and fitness metrics with clear limitations.
7 calculatorsMathematics
Solve percentages, equations, fractions, geometry, and statistics.
8 calculatorsEducation
Calculate grades, GPA, attendance, and practical study plans.
4 calculatorsShopping & Daily Life
Compare prices, discounts, tips, tax, units, and travel costs.
7 calculatorsBusiness & Home
Estimate pricing, break-even, materials, paint, and energy costs.
5 calculatorsSpecialized Tools
Handle inflation, EV charging, zakat, freelance income, and unit prices.
5 calculatorsCalcora / 50
All calculators
Search, filter, and sort the complete Calcora directory.
Finance
Compound Interest Calculator
Project investment growth with compounding and regular contributions.
Open calculatorFinance
Loan Calculator
Estimate periodic loan payments, total repayment, and interest.
Open calculatorFinance
Mortgage Calculator
Estimate monthly mortgage payments and optional housing costs.
Open calculatorFinance
Savings Calculator
Forecast savings with recurring deposits and a fixed return.
Open calculatorFinance
Salary Calculator
Convert hourly, weekly, monthly, and annual gross pay.
Open calculatorFinance
ROI Calculator
Measure investment return in money and percentage terms.
Open calculatorFinance
Currency Converter
Convert currencies with optional daily rates or your own rate.
Open calculatorShopping & Daily Life
Discount Calculator
Calculate savings and final price with one or two discounts.
Open calculatorFinance
Profit Margin Calculator
Calculate profit, margin, and markup from cost and price.
Open calculatorFinance
Retirement Calculator
Project retirement savings from age, contributions, and return.
Open calculatorAge, Date & Time
Age Calculator
Find an exact age in years, months, days, and total days.
Open calculatorAge, Date & Time
Date Difference Calculator
Count days, weeks, months, and years between two dates.
Open calculatorAge, Date & Time
Countdown Calculator
Count down days, hours, minutes, and seconds to a date.
Open calculatorAge, Date & Time
Time Duration Calculator
Calculate hours and minutes between two times, even overnight.
Open calculatorAge, Date & Time
Time Zone Converter
Convert a date and time between IANA time zones.
Open calculatorHealth & Fitness
BMI Calculator
Calculate adult body mass index and its standard category.
Open calculatorHealth & Fitness
Calorie Calculator
Estimate daily calorie needs using Mifflin-St Jeor.
Open calculatorHealth & Fitness
Body Fat Calculator
Estimate body fat with the U.S. Navy circumference method.
Open calculatorHealth & Fitness
Water Intake Calculator
Estimate a general daily fluid guideline from weight and activity.
Open calculatorHealth & Fitness
Sleep Calculator
Suggest bedtimes or wake times around approximate sleep cycles.
Open calculatorHealth & Fitness
Pregnancy Due Date Calculator
Estimate a due date from the last menstrual period.
Open calculatorHealth & Fitness
Heart Rate Calculator
Estimate maximum heart rate and exercise target ranges.
Open calculatorMathematics
Percentage Calculator
Calculate percentages, changes, and percentage differences.
Open calculatorMathematics
Scientific Calculator
Evaluate arithmetic, powers, roots, logs, and trigonometry safely.
Open calculatorMathematics
Fraction Calculator
Add, subtract, multiply, divide, and simplify fractions.
Open calculatorMathematics
Area Calculator
Calculate areas of squares, rectangles, triangles, circles, and trapezoids.
Open calculatorMathematics
Volume Calculator
Calculate volumes of cubes, prisms, cylinders, cones, and spheres.
Open calculatorMathematics
Quadratic Equation Calculator
Solve quadratic and linear equations, including complex roots.
Open calculatorMathematics
Statistics Calculator
Calculate mean, median, mode, range, and standard deviation.
Open calculatorMathematics
Ratio Calculator
Simplify ratios, find equivalents, and solve missing values.
Open calculatorEducation
GPA Calculator
Calculate weighted GPA from courses, grades, and credits.
Open calculatorEducation
Final Grade Calculator
Find the score needed on remaining assessments.
Open calculatorEducation
Attendance Calculator
Calculate attendance percentage and remaining allowed absences.
Open calculatorEducation
Study Time Calculator
Turn workload and available days into a simple study schedule.
Open calculatorShopping & Daily Life
Tip Calculator
Calculate tip, total bill, and each person's share.
Open calculatorShopping & Daily Life
Sales Tax and VAT Calculator
Add tax to a net price or extract it from a gross price.
Open calculatorShopping & Daily Life
Length Converter
Convert metric and imperial length units accurately.
Open calculatorShopping & Daily Life
Weight Converter
Convert milligrams, grams, kilograms, tonnes, ounces, and pounds.
Open calculatorShopping & Daily Life
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin, including negatives.
Open calculatorShopping & Daily Life
Fuel Cost Calculator
Estimate fuel needed and trip cost in metric or imperial units.
Open calculatorBusiness & Home
Break-Even Calculator
Find the sales volume and revenue needed to cover costs.
Open calculatorBusiness & Home
Selling Price Calculator
Set a price from cost and a target margin or markup.
Open calculatorBusiness & Home
Paint Calculator
Estimate paint needed for walls, openings, and multiple coats.
Open calculatorBusiness & Home
Concrete Calculator
Estimate concrete volume for slabs, columns, and cylindrical forms.
Open calculatorBusiness & Home
Electricity Cost Calculator
Estimate appliance energy use and electricity cost.
Open calculatorSpecialized Tools
Inflation Calculator
Project future prices or compare purchasing power using your rate.
Open calculatorSpecialized Tools
EV Charging Cost Calculator
Estimate charging energy and cost including efficiency losses.
Open calculatorSpecialized Tools
Zakat Calculator
Estimate zakat from net eligible assets and a provided nisab.
Open calculatorSpecialized Tools
Freelance Income Calculator
Estimate freelance gross income, expenses, and net income.
Open calculatorSpecialized Tools
Unit Price Calculator
Compare two products by price per unit of quantity.
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04 / Guides
Understand the number, not just the answer
Our concise guides explain assumptions, formulas, and common mistakes so a result becomes a better decision.
Explore all guides6 min read
Compound interest: why time changes the result
See how rate, frequency, contributions, and time interact — and why a projection is not a promise.
Read guide5 min read
Four percentage questions people often mix up
Find a percentage, reverse it, compare change, and avoid the margin-versus-markup trap.
Read guide6 min read
How to read health calculator estimates
Understand screening metrics, energy estimates, and when an individual assessment matters.
Read guide05 / FAQ
Questions, answered
A few useful details about how Calcora works.
Are Calcora calculators really free?
Yes. All 50 calculators are free to use, with no account, subscription, or usage limit.
Where are my calculator inputs processed?
Calculations run locally in your browser. Calculator form values are not submitted to a Calcora server. The optional live currency mode requests only the selected currency pair from Frankfurter.
Can I use Calcora in Arabic?
Yes. Every calculator, guide, navigation item, and legal page has an Arabic version with a right-to-left layout. Use the language control in the header.
Are the results professional advice?
No. Results are estimates for education and planning. Financial, medical, legal, construction, and academic decisions may require a qualified professional or an official source.
Does Calcora work on mobile devices?
Yes. Forms, results, search, and articles are designed for phones, tablets, and desktop screens, with keyboard-accessible controls.