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Practical explanations for the numbers you meet in a budget, a classroom or everyday life. Start with a worked scenario, try the linked tool, or explore the formula in our Knowledge library.
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Featured article · Everyday
How to Calculate a Discount
Find the saving and sale price, compare stacked coupons, recover an original price and avoid misleading percentage comparisons.
CalcOcean Editorial TeamPublished 5 min read
Latest articles
Health
Health
BMI vs BMR: What Is the Difference?
Understand why BMI is a height-and-weight screening ratio while BMR estimates resting energy needs, with examples and important limitations.
CalcOcean Editorial TeamPublished 5 min read
Read article: BMI vs BMR: What Is the Difference?
Health
How Many Calories Do You Need Per Day?
Follow a resting-energy estimate through activity adjustment, understand uncertainty, and use calorie calculations without treating them as prescriptions.
CalcOcean Editorial TeamPublished 5 min read
Read article: How Many Calories Do You Need Per Day?Conversions
Conversions
Celsius vs Fahrenheit Explained
Convert everyday temperatures in both directions, distinguish temperature readings from changes, and avoid common weather and recipe mistakes.
CalcOcean Editorial TeamPublished 5 min read
Read article: Celsius vs Fahrenheit ExplainedFinance
Finance
How Monthly Loan Payments Are Calculated
Work through a fixed-rate monthly payment, see how principal and interest change, and compare a payment estimate with the actual loan cost.
CalcOcean Editorial TeamPublished 5 min read
Read article: How Monthly Loan Payments Are Calculated
Finance
Simple Interest vs Compound Interest
Compare two interest models with the same principal, rate and term, and learn why payment timing and quoted rates affect the result.
CalcOcean Editorial TeamPublished 5 min read
Read article: Simple Interest vs Compound Interest
Finance
How Compound Interest Works
Understand compound interest, compounding periods and recurring contributions with a clear investment example.
CalcOcean Editorial TeamPublished 5 min read
Read article: How Compound Interest WorksEveryday
Everyday
How to Calculate a Discount
Find the saving and sale price, compare stacked coupons, recover an original price and avoid misleading percentage comparisons.
CalcOcean Editorial TeamPublished 5 min read
Read article: How to Calculate a DiscountDate & Time
Date & Time
How to Calculate Days Between Two Dates
Count elapsed dates or inclusive calendar days, handle leap years, and distinguish weekdays from hours and deadline rules.
CalcOcean Editorial TeamPublished 5 min read
Read article: How to Calculate Days Between Two DatesEducation
Education
How to Calculate GPA
Calculate equal-weight and credit-weighted grade averages, combine terms correctly, and check your school’s grading and rounding rules.
CalcOcean Editorial TeamPublished 5 min read
Read article: How to Calculate GPAMath
Math
How to Calculate Percentage Increase
Compare an old value with a new one, distinguish growth from percentage points, and check changes in prices, sales and budgets.
CalcOcean Editorial TeamPublished 5 min read
Read article: How to Calculate Percentage Increase
Math
How to Calculate a Percentage
Learn the basic percentage formula with worked examples for discounts, increases and everyday comparisons.
CalcOcean Editorial TeamPublished 5 min read
Read article: How to Calculate a PercentageBusiness
Business
How to Calculate ROI
Calculate return on investment, understand net gain and compare opportunities using the standard ROI formula.
CalcOcean Editorial TeamPublished 5 min read
Read article: How to Calculate ROI