Fuel pump meter reading calculator

Checks before signing

1. Record the station, period, nozzle, fuel grade and supplying tank on the sheet.
2. Copy both readings and check the unit, decimal places and digits before the decimal point.
3. If the closing reading is lower, check for a typing error or meter replacement first. Confirm a rollover only with evidence.
4. Keep the readings and have exceptions approved before reconciling sales and receipts.

Explanation / evidence / signatures

Formula and example (not your data)

Volume = closing reading − opening reading

For a litre meter with 2 decimal places: 12,845.92 − 12,345.67 = 500.25 litres. For a 5 whole-digit counter wrapping once: 100,000 − 99,990 + 15 = 25 litres.

Only one evidenced rollover with a lower closing reading is supported. Replacements, manual resets and multiple wraps require separate segments. US liquid and imperial gallons are distinct units. Results are rounded to 4 decimal places in litres, without temperature compensation or tax calculations.

NIST Handbook 44, Appendix C (2024): units of measurement
https://www.nist.gov/system/files/documents/2024/01/14/NIST%20HB%2044%202024%20Appendix%20C%20General%20Tables%20of%20Units%20of%20Measurement.pdf