An electric stove vs a gas stove
Reference:

^
Gas is almost always cheaper than electricity.
Natural gas is measured in Ccf or therms. For calculation purposes, they're essentially the same (1 ccf = 1 therm). There's no direct conversion because ccf measures the volume of gas, while therms measures the energy in the gas, and the amount of energy varies by the quality of gas. It's like trying to state how many calories are in a loaf of bread—it depends on the bread. In the U.S. in 2013, the average was 1 therm = 1.025 ccf. That's so close that for most purposes, therms and ccf are essentially interchangeable. Based on the above:

Ccf = hundred cubic feet. The "C" is roman for one hundred. Ccf ÷ 1.025 = therms.

One therm is 2.75 cubic meters, and 1 cubic meter is 0.36 therms.
 Mcf = thousand cubic feet. The "M" is roman for one thousand, not an abbreviation for million. Mcf ÷ 10 = Ccf. Mcf ÷ 10.25 = therms.

Therm = 100,000 Btu. therms x 1.025 = ccf. therms ÷ 100,000 = Btu.
 Btu = British thermal unit. Btus x 100,000 = therms.
 g/cf = "Typical" figures from Dept of Energy are (in mixed units) 22 g/ft³, so 1 kg is 45.5 ft³
Some gas bills measure the gas in cubic meters instead of therms. One therm is 2.75 cubic meters, and 1 cubic meter is 0.36 therms. 
Ccf = hundred cubic feet. The "C" is roman for one hundred. Ccf ÷ 1.025 = therms.