This is a difficult thing to gauge. We have seen everything from USD 20 to USD 1000 per person for guides and porters. Tipping is not required, but a small gesture of thanks to your guides and local porters. The level of the tip should reflect the level of satisfaction from and personal involvement with your guide. However, we recommend you to spend minimum 10% of your total trip cost for tipping entire local staffs, the ratio of tipping guide and porter will be given to you at the pre-trip meeting in Kathmandu before starting the trek.