The equity percentage handed over during any of the business funding stages varies on both the business and investors. The following amounts indicate the ranges you should be looking at. Note that earlier stages will consist of a lower financial amount, usually at a higher than average equity. This is due to the risk that investors will need to take when making their decision to invest in your company.
Pre-seed - Usually no equity as the funds come from family and friends.
Seed - 10% - 20%, sometimes 25%
Series A - 15% - 35%, average 25%
Series B - 10% - 20%, average 15%
Series C - 10% - 20%, average 15%