UTILITY BILL LAB

UPDATED JUL 26, 2026 · FORMULA AND REFERENCES REVIEWED

GAS · GAS-07

Natural Gas Bill Calculator

Estimate a gas bill from therms, price per therm and the monthly customer charge.

INPUTSEDIT ANY VALUE
ESTIMATELIVE RESULT
Estimated monthly bill$78.75
Variable gas charge$60.75
Projected annual bill$945.00

Planning estimate. Your utility’s tariff, taxes, tiers and adjustments control the actual bill.

FORMULABill = therms × price per therm + fixed charge
IMPORTANT LIMIT

Some utilities bill in Ccf or Mcf and apply heat-content conversions. Use the therm total when your statement provides it.

HOW TO USE IT

Copy the bill’s units first.

Match every field to the unit printed on your statement. Use the current billing period, preserve fixed charges, and compare a similar number of service days.

For a stronger estimate

  1. Use the exact rate from your bill instead of a reference average.
  2. Keep taxes, credits and past-due balances separate.
  3. Check tiers or time-of-use windows in the utility tariff.