Why This Site Exists
Most calculator sites reuse the same handful of generic formulas across hundreds of pages with different labels stuck on top. That approach breaks down for anything involving real statutory data: a state's actual corporate tax rate, this year's IRS bracket thresholds, or the difference between a sales tax and a state's separate vehicle excise tax. Bedrock Calculator was built to do the opposite. Every calculator is backed by a shared library of tested mathematical primitives, and every statutory figure is sourced from the actual government publication it comes from, not copied from another aggregator.
How It's Built
The full mathematical approach (exact decimal arithmetic instead of floating-point math, closed-form time-value-of-money solvers, day-count conventions, and the primary-source hierarchy used for every statutory table) is documented in detail on the Methodology page. Every calculator ships with a written test suite that checks its output against hand-verified reference values before it goes live, and every statutory data table records the specific government source and date it was last checked.
Found an Error?
If a calculator's math, a statutory rate, or a source citation looks wrong, that's exactly the kind of report this project wants. Reach out via the Contact page with the calculator name and what looks off, and it will get checked against the primary source directly.