PRICING TOOLS / 01
Fuel surcharge calculator
Turn diesel prices into a clear, consistent surcharge.
Calculation settings
Latest observation: Sep 7, 2026.
The reference price included in your freight rate.
20 means 20 surcharge percentage points for a 100% rise above base.
Leave a cap blank for no limit. Caps apply after rounding.
CALCULATED SURCHARGE
Workbook snapshotof your base freight charge
Fuel surcharge
$755.00Total with fuel
$1,755.0075.4720% before rounding and caps
THE MARKET
Diesel price history
U.S. average · dollars per gallon
View chart data
Range ends at the latest source observation. Monthly means use available weeks; boundary months may be partial.
| Date | U.S. diesel / gallon |
|---|---|
| Mar 9, 2026 | $4.859 |
| Mar 16, 2026 | $5.071 |
| Mar 23, 2026 | $5.375 |
| Mar 30, 2026 | $5.401 |
| Apr 6, 2026 | $5.643 |
| Apr 13, 2026 | $5.608 |
| Apr 20, 2026 | $5.403 |
| Apr 27, 2026 | $5.351 |
| May 4, 2026 | $5.640 |
| May 11, 2026 | $5.639 |
| May 18, 2026 | $5.596 |
| May 25, 2026 | $5.523 |
| Jun 1, 2026 | $5.350 |
| Jun 8, 2026 | $5.210 |
| Jun 15, 2026 | $5.059 |
| Jun 22, 2026 | $4.832 |
| Jun 29, 2026 | $4.668 |
| Jul 6, 2026 | $4.578 |
| Jul 13, 2026 | $4.796 |
| Jul 20, 2026 | $5.134 |
| Jul 27, 2026 | $5.313 |
| Aug 3, 2026 | $5.348 |
| Aug 10, 2026 | $5.257 |
| Aug 17, 2026 | $5.454 |
| Aug 24, 2026 | $5.652 |
| Aug 31, 2026 | $5.599 |
| Sep 7, 2026 | $5.967 |
Price data & updates
Choose a source or bring your own EIA file.
Observation: Sep 7, 2026 · Workbook released Sep 9, 2026. Automatic checks run while this page is open; EIA observations are weekly.
Starting with the supplied EIA workbook, released September 9, 2026.
Latest observation is older than the expected update window. Refresh or import recent data before quoting.
EIA workbooks use the U.S. price column automatically. CSV: date,price; ISO dates or M/D/YYYY; prices in $/gallon. Max 5 MB. Files are processed in this browser and are not uploaded.
Understand your surcharge
Base price: enter a fixed amount or choose a moving average and its length in months. Weekly data uses the simple mean of observations after the date that many calendar months before the latest observation, through the latest observation. Monthly imports use the latest N calendar months, including the latest reported month, with one price per month. Each observation has equal weight. The source, dates, and calculated base are shown above; insufficient history blocks calculation. Switching back to a fixed base restores your entered amount. A manually entered current price does not change the average window.
Miles driven: surcharge per mile = max(0, diesel price − base price) ÷ fuel efficiency in miles per gallon. Multiply by miles driven and round the trip surcharge to cents. For example, $4 diesel, a $3 base, and 5 MPG gives $0.20 per mile and a $100 fuel surcharge for 500 miles. No base freight charge is required. The fixed or moving-average base works with either pricing option. The illustrative 6 MPG default should be replaced with your vehicle’s average.
Proportional multiplier (freight pricing): ((diesel price − base price) ÷ base price) × multiplier = surcharge percentage. Enter the multiplier in percentage points: 20 produces a 20% surcharge when diesel doubles from the base.
Price increment: ((diesel price − base price) ÷ price increment) × percentage points. For example, $1.25 base and +1% per $0.06 produces 25% at $2.75. Partial increments count proportionally.
Rounding & caps (freight pricing): round to the nearest selected step, then apply the minimum and maximum. Positive half-steps round up. Blank caps are unlimited. The default 0% minimum prevents negative surcharges. Fuel charge = base freight × surcharge ÷ 100, rounded to cents; total adds that charge to the base freight. “No rounding” retains precision for the calculation; the displayed rate uses up to six decimals.
Data: EIA U.S. On-Highway Diesel Fuel Prices, weekly U.S. No. 2 diesel retail series. The fallback is extracted from the supplied workbook, released September 9, 2026. Live lookup uses EIA’s shared demo access and can be rate limited; manual entry and file import remain available. Defaults are illustrative and are not a carrier rate agreement.