Understanding Compound Interest: The Eighth Wonder of the World
April 15, 2025
Learn how compound interest works and why Einstein called it the eighth wonder of the world. Discover strategies to maximize your investments.
Accurate calculations and educational insights to help you answer everyday questions
Mortgage, loan, investment, retirement, and budgeting calculators
Basic math, algebra, geometry, statistics, and calculus calculators
BMI, calories, nutrition, fitness, and medical calculators
Currency, length, weight, volume, and temperature converters
Date difference, time zone, countdown, and age calculators
ROI, profit margin, payroll, and inventory calculators
Real estate, recipes, travel, and everyday calculators
Calculate monthly payments, interest, and amortization
See how your investments grow over time
Check your body mass index and health range
Convert between different currencies with up-to-date rates
Calculate percentages, increases, decreases, and more
Calculate exact age in years, months, and days
Calculate return on investment for business decisions
Calculate tips and split bills among multiple people
All calculators are completely free with no hidden fees or subscriptions required.
Access our calculators on any device with a responsive design that works everywhere.
Learn while you calculate with explanations, formulas, and helpful tips.
Your data stays on your device. We don't store or track your calculations.
Get instant results with precise calculations you can trust.
Many calculators include charts and graphs to help visualize your results.
Last Updated: September 2025
CalcHub was created to provide free, accurate calculators built with industry-standard formulas and validated methodologies. Since launch, the platform has served over 10,000 users with reliable calculation tools for finance, education, and everyday decisions.
Every calculator is built using professionally-recognized formulas and methodologies including CFPB guidelines for financial tools, current IRS tax tables, and standard amortization formulas validated against major financial institutions.
Each tool undergoes rigorous testing against edge cases and is cross-referenced with authoritative sources including government publications, academic standards, and professional financial guidelines to ensure 99.999% calculation accuracy.
Learn More About UsYou can easily calculate your BMI by inputting your height and weight into a BMI calculator. BMI is a useful screening tool that helps determine if you're in a healthy weight range for your height.
A 15-year mortgage has a higher monthly payment but saves you a significant amount in total interest compared to a 30-year mortgage. You can see the difference using our Mortgage Calculator to compare payment scenarios.
You can estimate a comfortable mortgage payment range by using an affordability calculator that factors in your income and existing debts to determine what you can safely afford.
Our date difference calculator can quickly tell you the exact number of days, weeks, months, or years between any two dates.
Your BMR is the number of calories your body burns at rest. You can calculate it to understand your daily energy needs, which is a key step in creating a nutrition plan.
You can use a cryptocurrency profit/loss calculator to easily determine your gain or loss by entering your buy and sell prices and any associated fees.
Our savings goal calculator helps you determine the required savings amount to reach a specific financial target by a certain date.
You can calculate the total interest paid on a loan by using our extra payment calculator to analyze how your payments affect the loan's overall cost and duration.
You can find percentages, calculate percentage changes, and more using our dedicated percentage calculator.
The standard BMI formula does not apply to children. You need a specialized Child & Teen BMI Calculator that uses age and sex-specific growth charts for an accurate assessment.
Our business day calculator can help you determine the number of business days between two dates, which is useful for deadlines and project planning.
Yes, you can set a countdown to any important event, like a wedding or vacation, using our countdown calculator.
While we don't have a specific credit score calculator, you can estimate your potential mortgage eligibility by using our mortgage affordability calculator.
You can calculate your academic performance and GPA using our GPA calculator.
You can estimate your daily caloric needs based on your age, gender, height, weight, and activity level using a calorie calculator.
Our currency conversion tools can help you convert between major fiat currencies as well as popular cryptocurrencies.
Our age calculator will give you your exact age in years, months, and days based on your birth date.
By making extra payments, you can shorten the life of your loan. Our mortgage payoff calculator shows you how early you can become debt-free.
You can find the mean, median, and mode for a set of data using our statistics calculators.
A debt-to-income (DTI) ratio below 36% is generally considered good. You can calculate your DTI using an affordability calculator to understand your financial health before applying for a mortgage.
April 15, 2025
Learn how compound interest works and why Einstein called it the eighth wonder of the world. Discover strategies to maximize your investments.
April 10, 2025
Explore the limitations and benefits of BMI as a health metric. Learn when it's useful and when other measurements might be more appropriate.
April 5, 2025
Discover practical budgeting strategies that fit modern lifestyles. Learn how to use our calculators to create and maintain a successful budget.