Natural Gas Bill Calculator

How it is calculated

The bill is one line of arithmetic. subtotal = therms × rate + fixed charge, tax = subtotal × tax % ÷ 100 and total = subtotal + tax. Tax is applied to the whole subtotal, fixed charge included; if your utility taxes only the gas, or adds separate delivery riders, the result will differ. Therms must be above zero, the rate per therm above zero, and the fixed charge and tax rate may be 0 but cannot be blank. Tax must be between 0 and 100. The tool also shows the energy in kWh using therms × 29.3071 (one therm is 100,000 BTU). It expects therms: a meter reading in CCF or cubic metres must be converted first, using the heat-content factor printed on your bill. Money is shown with the site's default currency symbol.

Common mistakes

• Typing the meter reading in cubic feet or cubic metres into the therms field. Convert using the heat-content factor on your bill; 85 CCF is not 85 therms.
• Entering the tax as a decimal, like 0.06. The field is a percentage, so 6 means 6%.
• Entering the bill's total in the rate field. The rate is the price of one therm, not the amount you pay for the month.
• Leaving the fixed charge out because it feels small. The field cannot be left blank, and the charge is paid even in a month with almost no use.
• Assuming the tool knows your utility's rate tiers. It uses a single flat rate for all therms, so a tiered or seasonal tariff has to be entered as an average.