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Custom summary formulas support calculations on custom formula fields Apply calculations only to summary rows can be used to calculate the summaries on numerical fields of summary and matrix reports 3900 chars per formula 5 per report Applies calc to only summary rows Custom formula fields are - Read only on record detail pages Not visible on edit pages - Are supported on std and custom objects Do not update last modified field Can reference custom/std / other formula fields Cannot reference themselves - Cannot be deleted if they are referred in formulas Not searchable via sidebar / advanced search Not included in data export - Not available for lead conversion Not available in Offline edition / connect for outlook Are automatically calculated - Cross object formula up to 5 levels