To read a natural gas bill, start with the billing period, meter reading and gas usage. Then separate the cost of the natural gas itself from delivery/distribution charges, fixed customer charges, taxes, adjustments and any previous balance. Finally, check whether the amount due represents only current charges or also includes money carried forward from an earlier bill.
Example of a Natural Gas Bill
The following is a fictional example. Your utility’s terminology, rates and bill design may be different.
| Bill Item | Example | What It Means |
|---|---|---|
| Billing period | 30 days | Length of the service period |
| Gas usage | 82 therms | Natural gas consumed during the period |
| Gas supply | $49.20 | Illustrative commodity cost |
| Delivery/distribution | $41.00 | Illustrative cost associated with delivering gas |
| Customer charge | $14.00 | Illustrative fixed service charge |
| Taxes/other charges | $5.80 | Illustrative additional charges |
| Current charges | $110.00 | Total fictional current-period charges |
1. What Is the Billing Period?
Start With the Dates
The billing period tells you which days are represented by the bill. EIA defines the billing period for natural gas as the period between bills; consumption is usually calculated from meter readings, although consumption can sometimes be estimated.
This matters because two monthly bills do not necessarily cover the same number of days.
For example:
- Bill A: 28 days
- Bill B: 34 days
Bill B includes six additional days of possible gas consumption.
When billing periods differ, compare average daily usage as well as total usage.
2. What Does the Gas Meter Reading Mean?
A natural gas meter records the volume of gas passing through it.
For a typical billing-period calculation, the previous meter reading is compared with the current reading.
Conceptually:
Current meter reading − previous meter reading = volume used
Utilities may then apply billing or conversion factors depending on how gas is measured and billed.
3. What Is a Therm on a Gas Bill?
A therm is a unit of heat energy.
EIA defines:
1 therm = 100,000 British thermal units (Btu).
This is different from a cubic foot, which measures physical volume.
Natural gas has heat content, so utilities can convert a measured volume of gas into an energy quantity.
4. What Are CCF and Mcf?
Natural gas can also be described using volume units.
| Unit | Meaning |
|---|---|
| cf | Cubic foot |
| CCF / Ccf | 100 cubic feet |
| Mcf | 1,000 cubic feet |
| Therm | 100,000 Btu of heat energy |
Do not assume that one CCF always equals exactly one therm.
EIA’s current conversion example uses the 2025 U.S. average heat content of gas delivered to end-use sectors and estimates 100 cubic feet at about 1.037 therms. EIA also cautions that natural-gas heat content varies by location, consumer type and time. :contentReference[oaicite:1]{index=1}
5. What Is the Gas Supply or Commodity Charge?
The supply or commodity portion generally represents the cost of the natural gas itself.
EIA describes the commodity cost as one of the two major components of consumer natural-gas prices. The other broad component is transmission and distribution. :contentReference[oaicite:2]{index=2}
Your bill might use wording such as:
- Gas supply
- Commodity charge
- Gas cost
- Natural gas charge
- Purchased gas cost
The exact terminology and calculation vary by utility, supplier and jurisdiction.
6. What Is the Delivery or Distribution Charge?
Natural gas must travel through infrastructure before reaching a home.
EIA says transmission and distribution costs include moving gas by pipeline from production or storage areas to local distribution utilities and delivering it to consumers. :contentReference[oaicite:3]{index=3}
Your bill might call this:
- Delivery charge
- Distribution charge
- Transportation charge
- Distribution service
Do not assume that every utility calculates these charges in the same way.
7. What Is the Customer or Service Charge?
Some gas bills include a fixed charge associated with maintaining service or the account.
Possible descriptions include:
- Customer charge
- Basic service charge
- Monthly service charge
- Fixed charge
A fixed charge can remain even when gas consumption is relatively low.
This is one reason dividing the entire bill by the number of therms can produce a misleading estimate of the actual commodity rate.
8. What Are Riders and Adjustments?
Depending on the utility and jurisdiction, a gas bill may contain additional rate adjustments or riders.
Names can include:
- Purchased gas adjustment
- Gas cost adjustment
- Rate adjustment
- Infrastructure-related rider
- Other utility-specific adjustments
The label alone does not tell you exactly what the charge means.
Check the utility’s current tariff, rate explanation or bill glossary if an adjustment is unfamiliar.
9. What If I Have a Separate Gas Supplier?
Some U.S. consumers live in areas with natural-gas customer-choice programs.
EIA explains that in such programs, a marketer may sell the natural gas while the local distribution company still delivers it to the home. Supply costs can therefore appear separately from distribution-related costs. :contentReference[oaicite:4]{index=4}
If a separate supplier appears on your bill, check:
- Supplier name
- Supplier rate
- Fixed or variable pricing
- Contract terms
- Introductory-rate expiration
Customer-choice availability varies by state and service territory.
10. What Are Taxes and Other Fees?
Depending on location, a gas bill can include taxes, government-related charges and other utility-specific amounts.
EIA notes that consumer natural-gas prices can include various taxes and fees. :contentReference[oaicite:5]{index=5}
Because these charges are highly location-specific, check the bill’s explanation rather than assuming that a line item applies nationwide.
11. What Are Current Charges vs. Amount Due?
These figures can be different.
For example:
| Account Summary | Fictional Amount |
|---|---|
| Current gas/service charges | $110 |
| Previous balance | $45 |
| Payment received | -$20 |
| Amount due | $135 |
In this example, the current billing period did not cost $135 by itself.
The $135 amount due includes account activity from outside the current period.
Gas Bill Charge Calculator
Enter the main charge categories from your gas bill. The calculator will total them and compare the result with the amount due shown on the bill.
Add Up Your Gas Bill Charges
Use the dollar amounts printed on your own bill.
How Do You Compare Two Gas Bills Correctly?
Compare These Items in Order
- Billing period dates
- Number of billing days
- Meter reading status
- Gas consumption
- Usage unit
- Average daily usage
- Commodity/supply rate
- Delivery/distribution charge
- Customer/fixed charge
- Adjustments and riders
- Taxes and fees
- Credits and payments
- Previous balance
- Total amount due
Why Can the Price per Therm Look Different?
Be careful when dividing your entire bill by the number of therms.
Your total bill may include fixed customer charges, distribution costs, taxes and other amounts in addition to the commodity cost.
Therefore:
Total bill ÷ therms ≠ necessarily the gas commodity rate.
Read the individual charge lines instead.
What If My Gas Bill Suddenly Increased?
Once you understand the bill structure, determine whether the increase came from consumption or pricing/account charges.
If therms increased sharply, start with our guide: Why Is My Gas Bill So High? 10 Things to Check.
If usage remained nearly unchanged but the bill increased, use: Gas Bill High but Usage Is the Same? What to Check.
What Should I Ask the Gas Utility?
If something still does not make sense, ask:
- What unit is my gas measured and billed in?
- How did you calculate the therms on this bill?
- Was my meter reading actual or estimated?
- What is my current gas commodity rate?
- What does the delivery charge cover?
- What is the customer charge?
- What does this rider or adjustment mean?
- Is a separate gas supplier involved?
- Does the amount due include a previous balance?
Bottom Line
Learning how to read a gas bill becomes much easier when you separate it into three parts:
1. How much gas did you use?
Check meter readings, therms or other usage units and billing days.
2. What did the gas and service cost?
Check supply/commodity, delivery/distribution, fixed charges, adjustments, taxes and fees.
3. Why is this the amount due?
Check current charges, previous balances, payments, credits and adjustments.
Once those three questions are answered, most unfamiliar gas-bill changes become much easier to investigate.
Authoritative Sources
U.S. Energy Information Administration — Natural Gas Prices:
Natural Gas Prices
U.S. Energy Information Administration — Natural Gas Units:
Natural Gas Price and Therm Conversion
U.S. Energy Information Administration:
Energy Units and Calculators
U.S. Energy Information Administration:
Natural Gas Customer Choice Programs