ExaCalc Blog

Learn the ins and outs of compound interest, the formula behind it, and how to use it to grow your wealth over time.

Everything you need to know about BMI, how it is calculated, what the numbers mean, and its limitations as a health metric.

Master the art of unit conversion with practical tips, common conversion factors, and strategies to avoid mistakes.

Discover the most important financial calculators that help you budget, invest, plan for retirement, and make smarter money decisions.

Explore how scientific calculators work, from basic arithmetic to trigonometry, logarithms, and complex number operations.

Master the EMI calculation formula, understand how interest rates affect your payments, and learn strategies to reduce your loan burden.

Understand how exchange rates work, factors that influence them, and tips for getting the best rates when converting money.

A clear guide to the three measures of central tendency, when to use each one, and how they reveal different aspects of your data.

Learn quick mental math tricks for percentages, common percentage formulas, and practical applications in shopping, finance, and academics.

Everything you need to know about mortgage math: monthly payments, amortization, refinancing analysis, and how to save thousands on your home loan.

Total Daily Energy Expenditure is the single most important number for weight management. Here's how to calculate yours, and what to do with it.

An amortization schedule shows exactly where every dollar of your loan payment goes. Understanding it can save you tens of thousands over the life of a loan.

Standard deviation is the most useful, and most misunderstood, statistic in data analysis. Here's how to read it, compute it, and use it correctly.

Systematic Investment Plans use rupee-cost averaging to reduce timing risk. Here's the math behind why regular investing usually wins.

Every country except the US, Liberia, and Myanmar uses metric. Here's how to move between both systems without mental gymnastics.

The classic advice is "3-6 months of expenses." Here's how to think about it more carefully based on your real risk profile.

Protein, carbs, and fats drive almost every diet outcome. Here's a no-nonsense guide to setting, and actually hitting, your macro targets.

The exact method for working out age from a date of birth, why month lengths make it tricky, how leap-day birthdays are handled, and how to count the days between any two dates.

Step-by-step GPA math: grade points, credit weighting, why you cannot just average semester GPAs, and how to work out the GPA you need to reach a target.

Tipping percentages, mental-math shortcuts, how to split a bill evenly, and whether to tip before or after tax, with worked examples.

What CAGR is, the formula, why it beats a simple average of yearly returns, and the situations where it misleads you.

How inflation erodes the value of money, how to calculate what an amount will be worth in the future, and why real returns matter more than headline returns.

The formulas for sale price and savings, how to find the original price from a sale price, and why two discounts of 20% and 10% do not add up to 30%.

What basal metabolic rate is, the Mifflin-St Jeor formula with worked examples for men and women, and how to turn BMR into a daily calorie estimate.

Margin and markup both describe profit, but they use different bases. Learn the formulas, how to convert between them, and how to price for a target margin.