Guides

The full explanations behind GetHubApps's calculators — formulas broken down term by term, worked examples with real numbers, and the caveats the calculators alone don't have room for.

• How EMI Is Actually Calculated, With a Worked Example

  The formula banks use, worked by hand on a real loan so every number is checked.

  Updated 12 September 2026

• BMI Explained: What the Number Means and When to Ignore It

  The formula, the categories, a worked example, and the well-documented cases where BMI gets it wrong.

  Updated 12 September 2026

• Simple vs Compound Interest: The Real Difference, With Numbers

  Same principal, same rate, same term — worked both ways so the gap is a real number, not just a rule of thumb.

  Updated 12 September 2026