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The elCalculador Blog

Practical guides on finance, health, science and lifestyle — with free calculators for every topic.

Finance
How to Calculate Your Monthly Mortgage Payment (And What Banks Don't Tell You)
Amortization formula, interest front-loading, LTV ratio, and when to use a calculator vs. broker.
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Health
BMI Calculator: What Your Score Actually Means for Your Health
The BMI formula, 4 weight categories, muscle mass limitations, and using BMI with calorie tracking.
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Finance
How to Calculate Fuel Consumption and Cut Your Driving Costs
L/100km vs MPG explained, manual efficiency test, cost-per-km formula, and fuel-saving strategies.
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Science
Scientific Calculator: Functions Explained for Students and Professionals
Sin, cos, log, exponents, and factorials explained with real-world applications.
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Business
Gross Margin vs. Markup: What's the Difference and Why It Matters
Formulas, the critical confusion between the two, and how to calculate your break-even point.
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Lifestyle
International Clothing Size Guide: US, UK, EU and Asian Sizes Explained
Why sizes vary globally, how to convert between regions, and how to measure yourself correctly.
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Health
How Many Calories Do You Actually Need Per Day?
BMR, TDEE, Mifflin-St Jeor vs Harris-Benedict, activity multipliers, and goal-setting.
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Finance
How to Estimate Your Income Tax Before Filing (Without an Accountant)
Gross vs net income, deductions, marginal vs effective tax rates, and pre-filing estimation.
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Finance
Percentage Calculator: The 5 Most Common Calculations Everyone Should Know
X% of Y, percentage change, difference, reverse percentage, and tip calculation with examples.
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Finance
Personal Loan Calculator: How to Know If You Can Really Afford That Loan
Monthly payment formula, total cost of borrowing, DTI ratio, fixed vs variable, red flags.
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Lifestyle
Why Unit Conversion Still Matters in a Global World (And How to Get It Right)
Metric vs imperial, everyday conversion errors, and NASA's USD 125M lesson.
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Global
Why a Multilingual Calculator Matters for Global Users
Decimal format conflicts, localization beyond translation, and EN/ES/FR/AR/HI global coverage.
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