Gravel Calculator — Tons, Cubic Yards & Weight

SOURCES — New Mexico Energy, Minerals and Natural Resources Department, Mining and Minerals Division, Conversion Factors for Construction Materials and Common Minerals (lists gravel sized 1/4 in to 2 in at 1.42 short tons per cubic yard, in a table the document says is adapted from BLM publication H-3890-1, Handbook for Mineral Examiners; the 1682 kg/m³ used here works out to 1.418 short tons/yd³, and 1.42 back-solves to 1685 kg/m³.) · Design and Control of Concrete Mixtures, EB001, 15th edition 2011, chapter 6 (Aggregates for Concrete), Portland Cement Association, now the American Cement Association (gives the approximate bulk density of aggregate commonly used in normal-weight concrete as 1200 kg/m³ to 1750 kg/m³ (75 lb/ft³ to 110 lb/ft³), determined by ASTM C29 (AASHTO T 19); the 1682 kg/m³ (105 lb/ft³) used here sits near the top of that range.) · NIST Guide to the SI (Special Publication 811), Appendix B.8 (short ton (2000 lb) to kilogram 9.071 847 E+02 and cubic yard to cubic meter 7.645 549 E-01, with foot to meter 3.048 E-01 and inch to meter 2.54 E-02 printed in bold as exact: the conversions behind the tons and cubic-yard outputs.) · FHWA and the South Dakota Local Technical Assistance Program, Gravel Roads Construction & Maintenance Guide, FHWA-OTS-15-0002, August 2015 (Appendix A places new road-surface material in horizontal layers "generally not exceeding a loose depth of 4 inches" (up to 8 inches where larger compaction equipment is available) and sets the surface gravel layer at "three inches minimum depth in order to have enough material for blade maintenance", the basis for the layer-depth and two-lift guidance.)