In California, executor and attorney fees are calculated as a percentage of the estate’s value. The formula for this calculation is set by law. In addition to these “statutory fees,” additional fees may be permitted by the court if extraordinary services are performed (“extraordinary fees”). The following calculator may help you determine how much probate will cost. Use the calculator below to estimate probate fees for estates worth over $166,250 up to $25,000,000. The Probate fee formula is set by California Probate Code Section 10810.