Market data
The crude chart shows EIA monthly spot price averages from January 2025 through September 2026. Brent minus WTI is calculated from matching months. Market Watch uses the EIA daily spot series and the weekly U.S. on-highway diesel series. Dates on the dashboard are observation dates. The monthly chart remains a historical snapshot.
Calculator inputs
Calculations run in your browser. Results use the prices, costs and quantities you enter, with rounding for display. Every tool explains its formula and assumptions on its page.
Editorial links
Worked examples explain a calculation or market measure. Where present, sponsored links are labeled and appear separately from editorial references.