i have done alot of research on this… its one quarter of a teaspoon (1.25 mls) just for the face. trust me, its alot more then you think if you measure it out!! This is the amount required to get the protection that the product actually states, so if you use an 8th of a tsp instead, your spf 30 sunscreen will only give you an spf of 15. So yea, when they say apply generously, they really do mean that! So given you have to literally soak your face in the stuff to get the protection you need, it is so important to choose the right facial sunscreen. The only ones I have found that are actually usable and dont leave you with a horrible sticky mess, are the asian sunscreens. The formulas are far superior then western ones and they protect against UVA rays better too (they even have a system to measure UVA protection, SPF only measures UVB protection. UVA rays tan you and age your skin. UVB rays only burn your skin. It seems this info isnt known about by many people). The best asian susncreen i have found is Kao biore aqua rich. if you google it you will find thousands and thousands of 4 and 5 star reviews and people raving about it. it really is that good a sunscreen. You can put so much of the stuff on with out it leaving any greasiness at all, and it leaves a perfect finish, make up or BB cream goes on top no problem. Also dont forget that the instruction to reapply your sunscreen regularly is also important. Non mineral/zinc based sunscreen actually break down as they are exposed to sunlight. It takes at most, two hours of direct UV exposure to completely break down the sunscreen. So if you apply it in the morning and are out and about for a few hours mainly outdoors, you will be wearing no sun protection at all by lunch time- when the UV rays happen to be the strongest. This is an important fact to remember. If you apply the sunscreen in the morning and head straight to a windowless office space however until lunch, the sunscreen will remain in tact (yes UV rays do penetrate glass so thats important to remember too, your still getting exposure when indoors if you are close to a window) Hope this info helps.