Gumroad Excel Tool : Profit Engine
Validated against a real UK giftware retailer dataset, where the tool flagged underpriced products and concentration risk automatically.
1M+
transactions tested
67%
profit from top 3 products
£6,600
monthly upside surfaced
Built & Published | A profitability analysis tool for product-based businesses, sold on Gumroad.
Overview
An Excel-based profitability engine for product businesses, especially those running drops and limited releases. It breaks a product catalogue into three things: profit per product, where that profit concentrates, and where pricing is leaving money on the table. Everything outputs in plain language, no financial background needed.
What It Does
- Inputs tab — enter products, costs, prices, units
- Insights tab — auto-generated plain-language analysis
- Logic tab — underlying calculations and Business Health Score
- Flags low-margin products, pricing gaps, and concentration risk automatically
Validation
Tested against a real UK giftware retailer dataset (1M+ transactions):
- Top 3 products drove 67% of total profit
- Two top-10 revenue products had sub-20% margins
- A £1 price increase on two underpriced products = ~£6,600/month in added profit with zero cost changes
Tools & Skills
- Python (openpyxl), advanced Excel formula architecture
- Business analysis, unit economics, pricing strategy
- Product design, building tools non-technical users can actually use
What This Demonstrates
- Ability to turn financial analysis into a usable product
- End-to-end execution, concept, build, validation, publish
- Commercial thinking beyond pure analysis
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