The appropriate engine size for a chainsaw depends on the type of work you will be doing. For lighter work such as pruning and light firewood cutting, a smaller chainsaw in the range of 20 to 40 volts for electric saws or 32 to 40cc for gas is recommended. For heavier work such as felling small trees, consider getting something in the range of 40 to 60 volts for electric saws or 40 to 62cc for gas.