Measure how much your bird eats in a whole day (amount given less the amount left at end of 24 hours)
Add up the amounts eaten every day for 7 days, then divide by 7 to get the average daily intake
The average daily intake determines the total amount of seeds and pellets (combined) to feed each day.During the switch you will gradually reduce the amount of seed fed, and make up the average daily intake with pellets.
Schedule for the Transition

Ideally, your bird will readily accept the new pellets, and you could make the switch quickly using a schedule such as this:

Week one: feed 75% of the calculated daily intake in seeds, and substitute pellets for the other 25%
Week two: feed 50% of the daily intake as seeds and 50% as pellets
Week three: feed 25% of the daily intake as seeds and 75% as pellets.
Week four: reduce the seed component even more for larger parrots.
For many birds, however, the switch may need to be much more gradual. For the average bird who is not used to eating pellets, you may need to try the following:

Offer a dish with pellets first thing in the morning
A couple of hours later, offer the seed mix, but substitute a formulated diet for only 10% of the seeds. Mix the pellets with the seed so your bird has to work around the pellets to get to the seed. You may want to grind some of the pellets and sprinkle them over the seed so the bird can get accustomed to the taste of the formulated diet.
Once you are sure your bird has at least tried the pellets, start to decrease the seed and increase the pellets in small increments until you get to the desired amount of seeds fed (see "Success!" below).
If your bird is still reluctant to try the pellets, you can offer the seed mix for only an hour or two a couple of times a day, with a dish of the pellets available all the time
Be patient - for really stubborn birds, the gradual shift may take months rather than weeks.
If your bird is in the stubborn category, keep a close eye on his or her weight (invest in a small scale and weigh regularly).
Success!
For smaller parrots such as budgies and cockatiels, once you achieve a diet that is just 25% seeds (25% seed, 50% pellets, and 25% fresh foods) you have succeeded! For larger parrots, continue to decrease the seeds a bit more so that the diet is only about 10% seeds overall (with about 50-60% pellets and the rest made up of fresh foods and treats). "New Foods and Picky Birds" offers more tips on introducing new foods to fussy eaters too.

Making the switch may be difficult, discouraging, and time consuming (not to mention the wasted pellets until your bird accepts them). Just remember, your effort is really worth it and you will be rewarded with a healthy bird on a well balanced and nutritious diet. Best wishes!

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