El Generador de Formulas Excel: Convierte un Calculo en Ingles Sencillo en una Formula Funcional
Por qué importa este prompt
Hand-built spreadsheet formulas for board and finance decks fail quietly far more often than people expect. A SUM that drops a text-formatted cell, an AVERAGE that includes a header row, or a blank cell silently treated as zero can shift a reported KPI enough to trigger a strategic conversation based on a wrong number. Once a bad figure has been presented to finance or the board, correcting it afterward costs far more in credibility than the two minutes it takes to get the formula right and understand exactly why it works before you present it.
Para qué lo usamos
You're a sales operations analyst at a mid-size SaaS company, working in a Google Sheets pipeline tracker with roughly 3,000 rows. Finance needs the weighted average discount percentage across all deals marked "Closed Won" in Q3, weighted by deal value, and a few rows have a blank discount field because a rep forgot to fill it in. The number is due in the quarterly business review deck in two hours, and you need a formula that handles the blanks correctly instead of silently including them as zero and skewing the average down.
Prompt
Act as a senior data analyst who has spent years cleaning up broken finance and sales spreadsheets and knows exactly how formulas silently fail. Context: I need a formula for the following calculation, described in plain English: [DESCRIBE THE CALCULATION YOU NEED, e.g. "weighted average discount percentage for all deals marked Closed Won, weighted by deal value"] Tool: [SPECIFY Excel (and version, e.g. Excel 365) OR Google Sheets] Relevant data: [DESCRIBE YOUR COLUMNS/RANGES OR PASTE A SAMPLE ROW, e.g. "Column G = deal stage, Column H = close date, Column I = discount %, Column J = deal value, data starts row 2, ends row 3000"] Edge cases to handle: [LIST ANYTHING THAT COULD BREAK A NAIVE FORMULA, e.g. "some rows in the discount column are blank," "some deal values are stored as text," "I only want deals closed within a specific date range"] Task: 1. Write the working formula, ready to copy and paste directly into the cell. 2. Break down what each part of the formula does, in plain English, step by step. 3. Flag anything in my data description that is likely to break this formula (mismatched data types, absolute vs. relative references, off-by-one range errors). 4. If the tool I specified has a simpler function available in a recent version that could replace an older-style formula, mention it as an alternative. 5. If there's a meaningful syntax difference between Excel and Google Sheets for this formula, note it even if I only asked about one. Constraints: Avoid volatile functions (OFFSET, INDIRECT, NOW, TODAY) unless the calculation specifically requires them. The formula must be copy-paste-ready with no placeholder text left inside it — resolve every range and condition using the data description I gave you. Assume I am an intermediate spreadsheet user: I understand basic functions like SUM and IF but don't regularly write nested array formulas. Output Format: - The Formula (in a code block, copy-paste ready) - Step-by-Step Breakdown (numbered, plain English) - What Could Break It (bulleted) - Excel vs. Google Sheets Note (only if relevant) - Simpler Alternative (only if one exists)
Resultado
The Formula (Google Sheets, weighted average discount for Closed Won deals in Q3, ignoring blank discount rows):
=SUMPRODUCT((G2:G3000="Closed Won")*(H2:H3000>=DATE(2026,7,1))*(H2:H3000<=DATE(2026,9,30))*(I2:I3000<>"")*I2:I3000*J2:J3000)/SUMPRODUCT((G2:G3000="Closed Won")*(H2:H3000>=DATE(2026,7,1))*(H2:H3000<=DATE(2026,9,30))*(I2:I3000<>"")*J2:J3000)Step-by-Step Breakdown
- The formula is built from two SUMPRODUCT calls: the top one calculates the sum of (discount × deal value) for qualifying rows, and the bottom one calculates the sum of deal value alone for the same rows. Dividing the first by the second gives a value-weighted average rather than a simple average.
- Each condition inside the parentheses — (G2:G3000="Closed Won"), the date range check, and (I2:I3000<>"") — evaluates to TRUE (1) or FALSE (0) for every row. Multiplying these conditions together means a row only contributes to the total if ALL conditions are true simultaneously.
- The (I2:I3000<>"") condition is what solves your blank-discount problem: any row where the discount cell is empty evaluates to FALSE, zeroing out that row's contribution entirely instead of treating a blank as a 0% discount, which would have dragged your average down incorrectly.
- The date range conditions (H2:H3000>=DATE(2026,7,1)) and (H2:H3000<=DATE(2026,9,30)) restrict the calculation to close dates within Q3 2026 specifically.
What Could Break It
- If the discount column (I) is formatted as text instead of a number (common when values are pasted from another system with a % sign as text), SUMPRODUCT will treat those cells as zero rather than throwing an error — check for left-aligned numbers in that column, which usually signals text formatting.
- If deal value (Column J) contains any blank or text cells within qualifying rows, the multiplication will silently zero out that row's contribution to both sums, which is usually fine but worth confirming isn't hiding missing data.
- The range G2:G3000 assumes your data never exceeds row 3000 — if new deals get added below that row, this formula will silently exclude them. Consider converting your range to a Table (Ctrl+T in Excel, or an equivalent structured range in Sheets) so the formula auto-expands.
Excel vs. Google Sheets Note: This exact formula works identically in Excel 365 and Google Sheets — SUMPRODUCT syntax is consistent across both. In older Excel versions (pre-2007), you may need to enter it as an array formula with Ctrl+Shift+Enter, but modern Excel and Sheets both evaluate it as a normal formula.
Simpler Alternative: If you only needed a straight sum-based condition without the weighting, SUMIFS would be simpler and faster to read — but because this calculation requires weighting by deal value, SUMPRODUCT is the correct tool here rather than a simplification.
La mayoria de las personas que necesitan una formula de hoja de calculo en realidad no quieren aprender la sintaxis de hojas de calculo — quieren el numero correcto en la celda, una explicacion en la que puedan confiar, y la seguridad de que no se rompera silenciosamente la proxima vez que alguien anada una fila. Este prompt esta disenado para ofrecer exactamente eso, y su estructura esta deliberadamente pensada para los puntos donde las solicitudes de formulas suelen fallar.
Por que este prompt esta estructurado de esta manera
El encuadre del Rol — un analista de datos senior que ha pasado anos arreglando hojas de calculo financieras y de ventas rotas — importa porque orienta al modelo hacia una escritura de formulas defensiva en lugar de la respuesta tecnicamente correcta mas corta. Un modelo al que simplemente se le pide escribeme una formula para X a menudo devolvera algo que funciona con datos limpios y se rompe en el momento en que aparece una celda en blanco o un numero con formato de texto. Enmarcar al modelo como alguien que ha depurado personalmente esos fallos hace que los senale de forma proactiva en lugar de esperar a que se le pregunte.
La seccion de Contexto separa explicitamente la descripcion del calculo, la herramienta (Excel o Sheets), el diseno de los datos y los casos limite en cuatro entradas distintas en lugar de un solo parrafo. Esto importa porque las solicitudes de formulas fallan con mas frecuencia cuando falta uno de estos elementos — alguien describe el calculo con claridad pero olvida mencionar un caso limite de celda en blanco, y recibe una formula que es correcta en teoria pero incorrecta con sus datos reales.
La lista de cinco tareas termina deliberadamente con una solicitud de una alternativa mas simple y una nota de sintaxis entre herramientas. Los analistas a menudo no saben que una funcion que estan usando ha sido reemplazada por algo mas limpio en una version reciente, o que la formula que estan a punto de pegar en Google Sheets usa sintaxis exclusiva de Excel. Pedir ambas cosas de antemano detecta esto antes de que se convierta en un error de copiar y pegar descubierto en medio de una presentacion.
Como adaptarlo
Para un calculo mucho mas simple — una SUMA directa o un CONTAR.SI sin complejidad de ponderacion o manejo de blancos — el modelo devolvera correctamente una funcion corta en lugar de fabricar complejidad innecesaria con SUMAPRODUCTO o formulas matriciales. La estructura se ajusta tanto hacia abajo como hacia arriba.
Para calculos recurrentes que tu equipo ejecuta en cada ciclo de reportes, vale la pena guardar la formula final junto con su explicacion paso a paso en algun lugar al que todo tu equipo pueda hacer referencia — eso convierte un prompt puntual en conocimiento institucional que sobrevive incluso cuando el analista original se muda a otro proyecto.