Guides

Short explainers that pair with CalcWell calculators—formulas, examples, and when to use each tool.

• How to Calculate Percentages

  Learn the percentage formulas for finding X% of Y, percent change, and reverse percentages with clear examples.

• Compound Interest Explained

  Understand how compound interest grows savings and debt, with formulas, examples, and when compounding frequency matters.

• Understanding GPA Scales

  Compare 4.0, weighted, and percentage GPA scales, and learn how letter grades convert to grade points.

• Metric vs Imperial Units

  A practical guide to converting between metric and imperial length, weight, volume, and temperature units.

• Time Zone Basics

  Learn how UTC offsets, daylight saving time, and common city time zones work when scheduling across regions.