How to Read Your Gas Bill

Quick Answer

Read a gas bill by finding the metered usage first, converting it to the billed unit with the factor your utility prints on the statement, and checking each line item against the utility’s current published rate before questioning any charge.[6][7]

Then set expectations before you worry about the total. Natural gas bills are seasonal: heating dominates home gas use, and nationwide, residential gas consumption in January runs about 19% of the annual total versus about 2.4% in July — so a January total several times the July total is the data, not an error.[1]

Start With the Account Details

Record these items before comparing a bill:

1. Service address, account class, and rate-schedule name.
2. Billing-period start and end dates and total billed days.
3. Current and prior meter readings, read status, and unit shown.
4. Total billed usage and any conversion factor shown by the utility.
5. Each itemized charge, credit, tax, rider, or one-time item.

Utilities can bill gas use in different units and may apply account-specific conversion or rate rules. Use the unit and calculation shown in the provider’s own materials rather than assuming CCF, MCF, and therms are interchangeable in every circumstance.

Line-Item Walkthrough: What Each Charge on Your Gas Bill Means

A typical regulated gas bill has two main parts — the gas itself and its delivery — plus fixed fees, riders, and taxes. National Grid describes the split directly: “National Grid separates your bill into two services: supply and delivery,” with supply being the portion “for which you can shop for your gas supply from a supplier other than National Grid."[7] NIPSCO’s bill guide matches: “Your natural gas bill has two main parts: Gas Supply Charges and Delivery Charges."[8]

Utilities structure these differently. Columbia Gas of Ohio sets its default supply price through a PUCO-supervised auction and adjusts it monthly; the delivery side is a regulated rate.[6] Check which side each rate on your bill sits in before comparing or disputing it — see How to Compare Delivery and Supply Charges on a Utility Bill.

Verify Which Side Each Rate Sits On

The most common mistake in gas-bill explainers is filing a supply mechanism under delivery. Check what each named rate actually is before you use it:

A correction this guide carries from its earlier version: it previously used Columbia Gas of Ohio’s “$3.25 per Mcf added to NYMEX” figure as a delivery example. That mechanism is Ohio’s SCO — the state’s default supply rate, set by auction [6]. The $3.25 figure no longer appears on the utility’s current rate page, so both the category and the number were corrected. The lesson stands: an SCO is not an infrastructure charge; do not cite default-service rates as delivery costs.

Worked Check: Verify a Bill Against Its Own Numbers

Take your statement and run the arithmetic line by line — the sample below is illustrative:

Check it in this order:

1. Usage: compare meter readings and billed therms against the conversion factor on the bill (see below).
2. Rates: multiply usage by each per-unit rate yourself and confirm the line totals.
3. Fixed items: confirm the customer charge and riders match the utility’s current tariff.
4. Taxes: apply the printed percentage to the correct base.
5. Total: add the lines and compare against the amount due.
6. Rates against the utility’s published pages. Columbia Gas of Ohio publishes its monthly SCO calculation openly, so you can rebuild your supply line step by step [6]: start with the NYMEX month-end settlement price ($2.7250/Mcf for August 2026); add the retail price adjustment set by the annual PUCO auction ($2.25/Mcf from January 2026); total them ($4.975/Mcf, billed as $0.4975/Ccf); then multiply your therms by the per-therm equivalent (≈$0.48, at 1 Mcf ≈ 10.37 therms). The SCO price resets monthly with the market even though the formula stays fixed [6].

If a line no longer matches the current published rate or tariff, that is the number to question with the utility.

Therm/CCF Conversion: A Worked Example

Gas is measured by volume (cubic feet) but billed by energy content (therms). EIA’s conversion factors put natural gas at about 1,036 Btu per cubic foot, with 1 therm equal to 100,000 Btu — so 1 Ccf (100 cubic feet) carries about 103,600 Btu, or roughly 1.03–1.04 therms.[4] The exact factor varies by gas quality and is shown on your bill.

Worked example:

1. Meter reading shows you used 60 Ccf this month.
2. Your bill states a conversion factor of 1.037 therms/Ccf.
3. Billed therms = 60 Ccf × 1.037 = 62.2 therms.
4. If your supply rate is $1.40/therm, the supply charge = 62.2 × $1.40 = $87.08.

If your utility bills directly in therms (from an energy-reading meter), no conversion is needed — the meter already reads in therms.

Seasonal Usage Context

Natural gas consumption is highly seasonal because space heating is the dominant load. EIA’s RECS 2020 data put the annual end-use split for gas-heated homes in very cold and cold climates at about 607 Ccf per year for space heating, 184 Ccf for water heating, and about 41 Ccf combined for cooking and clothes drying — space heating is about 73% of it. RECS reports annual consumption, not monthly figures.[5]

The monthly shape comes from EIA’s consumption series: averaged over 2020–2024, national residential gas use in January ran about 19% of the annual total, with July around 2.4% — a roughly 8-to-1 winter-to-summer swing in monthly volume.[1]

What that means for your own bill: gas-heated homes in cold climates typically peak near 100–200 therms in the deepest winter months and fall to roughly 10–40 therms in summer — consistent with EIA’s January and July consumption shares[1] and with cold-climate annual use around 860 therms[5]. Compare your own bill to the same month last year, not to last summer. A January-to-January comparison across similar weather isolates rate changes from usage changes.

National Residential Gas Prices (2024–2026)

According to EIA data, the average U.S. residential natural gas price was:

Early 2026 prices sit near or below 2025’s average — but note the seasonal trap: residential $/Mcf runs higher in the off-season (May 2026 averaged $19.83/Mcf) because fixed costs spread over low summer volumes, so always compare like months.[4]

Source: EIA Natural Gas Residential Price (retrieved 2026-08-29).[2][9] Prices vary widely by state — California ($22.01/Mcf in 2025), Florida ($25.48), and Hawaii ($52.38) sit well above the national average, while Colorado ($11.17), Idaho ($7.69), and Michigan ($10.92) sit below; New York ran $17.58 in 2025.[3]

Can You Shop the Supply Side?

Supply — often, yes. In choice markets you can buy gas from a competitive supplier while the utility keeps delivering it. National Grid frames it directly: supply is the portion “for which you can shop for your gas supply from a supplier other than National Grid,” delivered “regardless of your choice of supplier” — and the utility passes through cost: “National Grid does not mark up the price of natural gas sold to our customers; you pay what we pay."[7] Compare any supplier offer against your utility’s posted default rate (in Ohio, the monthly SCO price [6]) on a total-cost-per-therm basis before switching.

Delivery — no. The pipes serving your street are a monopoly; delivery charges stay with the local utility regardless of who sells you the gas [7]. The only lever is regulatory: rate cases are filed with your state public utility commission, which posts them for public review.

A supplier offer is supply-only. Before switching, put the offer’s per-therm price next to your full current bill — delivery, riders, and taxes included — not just next to the supply line.

Compare Like With Like

When a total changes, compare a similar billing period and record:

• the number of billing days;
• billed gas use and read status;
• weather and occupancy changes;
• rate-schedule or tariff changes; and
• credits, past-due amounts, or one-time items.

The total amount due alone cannot identify whether a change came from usage, a rate, or a non-usage charge.

When to Contact the Utility

Contact the provider if a meter reading, usage unit, rate schedule, or line item does not match the statement or current tariff. Ask for the account-specific explanation, the tariff version, and the provider’s review or dispute process. Keep copies of the bill and your contact record.

Reconciling Related Guides

Comparing guides on this site: Why Is My Gas Bill So High? uses a worked winter example reaching about 200 therms for a well-heated home in a cold month — the upper part of the range above — and keeps heating separate from water heating. MCF vs CCF vs Therms quotes winter volume in Ccf (100–150 Ccf), which is the same ballpark expressed in volume units: 100–150 Ccf ≈ 104–156 therms at the 1.037 factor. All three pages describe the same seasonal reality: deep-winter peaks in the low-to-mid hundreds of therms for homes that heat with gas, a 10–40 therm summer baseline, and month-to-month comparisons made within the same season.

Sources

1. EIA — U.S. Natural Gas Residential Consumption (monthly) — monthly residential consumption, 2020–2024 seasonal shares (retrieved 2026-08-29).
2. EIA — Price of Natural Gas Delivered to Residential Consumers — annual U.S. residential price (retrieved 2026-08-29).
3. EIA — Natural Gas Residential Price Summary, by state — 2025 state prices (retrieved 2026-08-29).
4. EIA — British Thermal Units (Btu) — natural gas heat content and therm conversion (retrieved 2026-08-29).
5. EIA — RECS 2020, Consumption & Expenditures Tables (CE5.4) — annual household natural-gas end-use consumption by climate region (retrieved 2026-08-29).
6. Columbia Gas of Ohio — Standard Choice Offer — posted SCO calculation (retrieved 2026-08-29).
7. National Grid — Gas Supply Costs — supply vs. delivery structure and Gas Adjustment Factor (retrieved 2026-08-29).
8. NIPSCO — Understanding Your Gas Bill — supply/delivery breakdown and fee structure (retrieved 2026-08-29).
9. EIA — Natural Gas Residential Price, monthly series — Jan 2026 $13.96/Mcf, Feb 2026 $15.06, May 2026 $19.83 (retrieved 2026-08-29).