Enter your mower's power draw, mowing time, and mows per season to see electricity cost versus a gas mower.
Electric mowers also avoid oil changes, spark plugs, and air filters that add to a gas mower's total cost of ownership beyond fuel alone.
An electric mower's running cost per season is typically a small fraction of an equivalent gas mower's fuel cost, since electricity is cheap per unit of energy compared to gasoline and electric motors convert more of that energy directly into cutting power. This doesn't include the mower's own purchase price or battery replacement over time, which are separate factors in a full cost-of-ownership comparison.
Running cost is essentially the same since both draw from the grid to charge — the difference is mainly convenience (no cord) versus battery replacement cost down the road.
Between fuel, oil changes, and occasional tune-ups, a typical gas mower can cost $30-80+ per season depending on lawn size and mow frequency, well above most electric mowers' electricity cost alone.