Private in-browser planning
Natural Gas Rate Comparison Calculator
Starting values are hypothetical. Replace them with your own figures. Inputs stay in this browser and are not included in the energy inquiry.
- Both quotes must be converted to $/therm before entry.
- Fees multiply by months; usage is the total for the whole comparison period.
Normalize the units before comparing prices
A therm represents 100,000 Btu, while an MMBtu represents one million Btu. Therefore one MMBtu is ten therms. A $6.00 per MMBtu commodity quote is $0.60 per therm before other charges. Ccf and Mcf measure volume, so their conversion also needs the actual heat-content factor rather than a universal assumption that one Ccf always equals one therm.
When a quote is priced per Mcf, first determine therms per Mcf using the utility’s billing factor, then divide dollars per Mcf by therms per Mcf. The linked gas converter helps with that step. Check whether the bill’s printed factor already includes pressure or other corrections so you do not apply an adjustment twice.
Calculate the complete stated supply scope
Offer cost equals period therms multiplied by the entered rate, plus months multiplied by the monthly supplier fee. Effective supply rate includes those fees and divides by period therms. Zero consumption produces fee totals but no meaningful effective rate. The tool reports A minus B; a positive difference means B is cheaper for the entered usage and term.
As a hypothetical example, 10,000 therms at $0.65 with no fee cost $6,500. A second offer at $0.60 with a $30 monthly fee over twelve months costs $6,360. The difference is $140, and the second effective rate is $0.636 per therm. A lower commodity price does not produce its full headline difference once recurring charges are included.
Understand what a gas quote leaves variable
Commodity, transportation, distribution, balancing and other charges can be presented differently by different suppliers. A fixed commodity component does not automatically fix the entire delivered bill. Match the included services and billing scope before interpreting a small rate difference. Where applicable, inspect how the contract treats daily requirements, nominated quantities, excess use and unused commitments.
Gas consumption may concentrate in cold months or around production schedules. A comparison based on flat monthly averages can conceal seasonal exposure. For annual purchasing, use an actual monthly history and confirm that both quoted structures cover the same delivery months. A winter-heavy account should not substitute an unrelated summer price simply because it is easy to obtain.
Turn the result into an actionable review
Keep the unit conversion, heat-content source, quote dates and monthly usage assumptions with the comparison. Ask for a breakdown when one proposal seems materially cheaper but does not describe transportation or balancing. An account’s eligibility, utility rules and existing contractual obligations still determine whether an offer can be used.
This tool makes no market prediction and does not recommend a fixed or floating strategy. If a proposal includes an index-linked portion, model explicit high and low prices and examine the open volume. Use the hedge-ratio tool for that allocation, and include exit costs in the break-even tool before considering a change from an existing contract.
Sources & scope
Primary references reviewed October 15, 2026. These sources support the stated concepts; actual tariffs, program rules and signed agreements govern the account. Decision examples and operational worksheets are original educational analysis.
- EIA: Energy units and calculators explained
Rounded energy conventions: 1 kWh = 3,412 Btu and 1 therm = 100,000 Btu. Natural gas heat content varies. - EIA: Heat content of fossil fuels
Natural gas volume-to-energy conversion depends on heat content, which reflects fuel composition. No national average is represented as a customer billing factor. - EIA: Factors affecting natural gas prices
Natural gas supply, demand, weather, storage and infrastructure can affect prices. No forecast or recommended hedge allocation is taken from this source.