SUMIFS

Why this lesson matters: SUMIFS

Summarise values using multiple text, number, and date conditions. In this module, the skill supports a larger goal: Answer focused business questions with criteria-based totals, averages, and counts. The practical application is to build a region-by-month management summary.

=SUMIFS(Revenue,Region,H2,Month,H3)

Build it step by step

Work from the business question toward the formula or tool. Keep the source data separate from the output and make every important assumption visible to the reviewer.

• Separate the measure range from the criteria ranges.
• Make every criteria range the same size.
• Reconcile detailed results to an unconditional control total.

Check the result and common failure points

A conditional report should add back to a known total when its categories are mutually exclusive and complete. Also test a known record, a missing or blank value, and a boundary case. Confirm that ranges are the same size, units are consistent, and copied references move only where intended.

• Compare at least one result with a manual calculation or filtered source record.
• Test blanks, zeros, duplicates, errors, and the exact rule boundary.
• Reconcile row counts or totals before relying on the output.

Use the result in a decision

Build a region-by-month management summary. Label the output clearly, state its period and unit, and explain the action it supports. A technically correct result is only complete when another person can understand, refresh, and review it.