ianwelkins

ianwelkins created Gravel Calculators and maintains every part of it: the calculators, the guides, and the methodology behind them.

What ianwelkins is responsible for

• Building and maintaining every calculator on this site.
• Checking each calculator's formulas and density figures against hand calculations before publication, and whenever an error is reported.
• Writing and reviewing the guides.
• Handling error reports sent via the report-an-error page and ianwelkins@gmail.com, and publishing corrections when a confirmed error is fixed.
• Reviewing the site's pages at least every 6 months — each page shows the date of its last review.

Guides by ianwelkins

• How Much Gravel Do I Need? — the formula, depth guidance, and worked examples.
• Gravel Types and Sizes Explained — what grading codes mean and where each grade belongs.
• Gravel Driveway Guide — layers, depths, materials, and maintenance.
• Are Online Gravel Calculators Accurate? — what an estimate can and cannot tell you.

Key tools by ianwelkins

• Gravel Calculator — the main all-in-one tool.
• Gravel Cost Calculator — single-layer and two-layer driveway pricing.
• Gravel Weight Calculator — volume-to-weight conversion with a density table.
• Cubic Yards to Tons Calculator — bidirectional conversion.

All tools are listed on the calculators hub and the applications hub. The formulas and testing behind them are documented in the methodology.

Contact

Corrections, feedback, and questions are welcome at ianwelkins@gmail.com, or through the error report form.