Build the model before the visuals
Read what each row represents and create only the documented relationships. Check your totals before adding more visuals. A polished chart does not correct a duplicated amount or an ambiguous measure.
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Dataset collection
Free Datasets for Power BI Projects
Find free datasets for Power BI dashboards and data modeling. Compare sales, subscriptions, marketing, and inventory analysis projects.
Decide what the report should explain: order activity, customer retention, campaign spending, or inventory movement. Then choose the dataset whose fields and history support that question.
Compare your options
Choose a dataset for the work you want to complete
| Dataset | Model shape | Dashboard ideas | Useful measures |
|---|---|---|---|
| Ecommerce Sales & Returns | 6-table relational model | Order activity, repeat customers, payments, and refunds | Counts, rates, and value |
| SaaS Subscriptions & Churn | 5-table relational model | Current MRR, retention, billing, and payment outcomes | MRR, churn, retention |
| Marketing Campaigns & Conversions | 4-table relational model | Spend, conversion rate, CAC, ROAS, and channel mix | Counts, rates, and value |
| Inventory & Supply Chain | 7-table relational model | Stock position, receipts, supplier lead time, and adjustments | Closing units, receipts, lead time |
| Bike Sharing Demand | Time-series table | Hourly demand, seasonality, weather, and rider type | Counts, rates, and value |
Start here
Recommended relationship model
For the ecommerce source tables, begin with one-direction relationships from dimensions into business events.
- customers[customer_id] → orders[customer_id]: one to many
- orders[order_id] → order_items[order_id]: one to many
- orders[order_id] → payments[order_id]: one to many
- orders[order_id] → refunds[order_id]: one to many
- Keep order value, payment value, and refunds as separate base measures.
Practical guidance
Start with a useful result
Make the finished report understandable
Label the reporting period, units, and metric definitions. Include a short source note and explain any filters that change the measured population. A useful dashboard should make its assumptions visible.
Are Power BI report files included?
This collection helps you find data for your own reports. Check each download list for the actual included files; a Power BI project idea does not mean a finished report file is provided.
Understand the data behind the dashboard
Practice the joins, models, and definitions that turn source records into a report someone else can trust.