MayeleCalc Journal
Understand the numbers
behind your decisions.
Clear explanations, practical examples, and calculation guides written for everyday people.
Latest insights
Featured articles
What really determines your mortgage payment
Understand principal, interest, taxes, insurance, HOA costs, and the assumptions behind a housing estimate.
Debt avalanche or debt snowball: which method fits?
Compare two popular payoff strategies and the tradeoff between mathematical savings and motivation.
How to calculate an emergency-fund target
Turn monthly essential expenses, income stability, and personal risk into a practical savings range.
How to calculate percentage increase and decrease
Learn the correct denominator, interpret positive and negative change, and avoid common percentage mistakes.
Average versus median: choosing the useful center
Understand why the mean and median tell different stories about salaries, prices, grades, and datasets.
How weighted GPA calculations work
See how grade points and credit hours combine—and why a simple average of grades can be misleading.
How daily calorie needs are estimated
Understand BMR, activity multipliers, energy balance, and why estimates should be adjusted over time.
Hydration needs: why one number does not fit everyone
Learn how body size, climate, activity, diet, pregnancy, and health conditions influence fluid needs.
Understanding maximum heart rate and training zones
Learn what heart-rate zones estimate, how intensity changes, and when formulas need personal context.
Force, mass, and acceleration in everyday motion
Understand Newton’s second law, unit consistency, net force, and the difference between mass and weight.
Kinetic and potential energy through motion
See how height, mass, speed, and conservation of energy connect common physics problems.
Ohm’s law: voltage, current, and resistance explained
Use V = IR confidently and understand the assumptions behind basic electrical calculations.
Molarity and dilution: keeping concentration calculations clear
Understand moles per litre, the dilution equation, unit consistency, and safe laboratory reasoning.
The ideal gas law and when real gases differ
Learn how pressure, volume, temperature, and moles connect through PV = nRT.
Half-life and exponential decay made understandable
Follow how a quantity changes across half-lives and distinguish exponential decay from linear subtraction.
How loan payments really work
Understand principal, interest, term length, and why small rate changes can reshape a monthly payment.
Percentage, markup, and margin are not the same
A practical guide to three commonly confused calculations for pricing, sales, and business decisions.
What BMI can—and cannot—tell you
Learn how BMI is calculated, where it can be useful, and why personal health context still matters.
pH explained without the confusion
A clear introduction to the logarithmic pH scale and hydrogen-ion concentration.
The relationship between speed, distance, and time
Use one simple formula to solve three different motion questions with confidence.
Compound growth: why time matters most
See how rate, time, and contribution frequency combine to change long-term results.