MarginDeckGuides & tools
Understand what each product really costs and contributes.
Practical methods for running several software products, written by the maker of MarginDeck. Every guide works with a spreadsheet; the calculators run in your browser.
Guides
Methods you can apply in a spreadsheet today.
- Product Finance
Contribution Profit for Indie Apps: A Practical Guide
Learn how to calculate product-level contribution profit, choose useful cost boundaries, and turn the result into better indie app decisions.
Read the guide → - Product Operations
How to Allocate Shared SaaS Costs Across Multiple Products
Compare equal, revenue-weighted, usage-based, and custom cost allocation, with a worked example and effective dates.
Read the guide → - Indie Operations
The Real Cost of Running Multiple Software Products
A practical way to uncover direct expenses, shared subscriptions, owner time, and hidden obligations across a portfolio of software products.
Read the guide → - Product Planning
What Will a New Software Product Cost Over the Next 12 Months?
Build a practical 12-month cost plan for a new app by separating existing resources, new scheduled costs, one-time expenses, and currencies.
Read the guide → - Product Operations
How to Change a Subscription Cost Without Rewriting History
A practical method for recording subscription price, cadence, and billing-date changes while preserving the terms that applied to earlier periods.
Read the guide →
Free tools
Quick scenarios in your browser. Nothing is uploaded.
- Free tool
Shared cost allocation calculator
Split one monthly cost pool across 2–5 products by equal share, revenue or custom percentages, and see estimated contribution profit.
Open the tool → - Free tool
Runway calculator
See how many months the cash you set aside covers your products at their current monthly revenue and costs.
Open the tool →