Free tools
Rock Tumbling Calculators & Tools
Simple tools built around repeatable rock-tumbling decisions that are easier to answer with inputs than with another generic article.
Rock Tumbler Grit Calculator
Estimate a practical starting amount from actual rock-and-media weight and tumbler type.
Rock Compatibility Checker
Compare two common materials using hardness, toughness and fracture behavior before building a mixed batch.
Why tools belong on this site
Rock tumbling has repeated decisions involving material load, abrasive quantities, stage timing and material compatibility. Interactive tools can reduce arithmetic and make a process easier to repeat. Each tool explains its assumptions and limitations instead of presenting an estimate as a universal rule.
Tools are paired with complete guides
A calculator or checker should shorten a decision, not replace the reasoning behind it. Use the Compatibility Chart for the full material framework and How Much Grit per Pound? for the assumptions behind the grit calculator.