What do you mean? In Bitcoin? It depends on the liquidity of the exchange you are using. Movements and price of each exchange are different. If you look at the depth charts, you can see the sum of all orders until certain prices. You can calculate the price + 5% and put the mouse cursor over that price and it usually gives you the sum volume needed until that price. This interface may depend on the exchange, but most exchanges have similar features. However keep in mind that the orders are constantly changing and specially those close to the price.