Historical Pricing Context
Bundled monthly history per commodity (BLS PPI / EIA / USDA NASS / FRED) with 25 / 50 / 75 / 90 percentile bands over a user-selected lookback. Reference only; no live fetch.
Formula and source
Bundled monthly time series per commodity from public BLS PPI / EIA / USDA NASS / FRED federal series. Percentile bands (p25 / p50 / p75 / p90) computed via linear-interpolation type-7 quantile over a user-selected lookback window.
Mixed federal series, build-fetched at the build date stamped on each shard. BLS PPI series WPU* (industrial commodities); EIA series PET.* / NG.* (retail fuel + city-gate gas); USDA NASS / FRED PWHEAMTUSDM / PMAIZMTUSDM / PSOYBUSDM (agricultural).
Audience
This tile is built for trades and the adjacent professions in the Historical Reference Data group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.
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Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.