How to DIY: Financial Modeler
A financial model that shows investors my startup makes sense financially — revenue projections, unit economics, and a clear path to profitability
Tools used in this guide
4How to DIY: Financial Modeler
A step-by-step guide to doing this yourself — honestly.
What you're really trying to do
A financial model that shows investors my startup makes sense financially — revenue projections, unit economics, and a clear path to profitability
DIY Cost
$0
15-40 hours to learn
Hire Cost
$500-$10,000+
Done for you
You could save $500-$10,000+ by doing it yourself
Step-by-Step Guide
Follow along at your own pace. Most people finish in 15-40 hours.
Learn the fundamentals with free courses
~5hCorporate Finance Institute (CFI) at corporatefinanceinstitute.com has free courses on financial modeling basics and Excel for finance. Their 3-statement model tutorial is the gold standard. If you're building a startup model specifically, watch Y Combinator's 'Startup School' finance lectures on YouTube — they're more practical than MBA courses.
Download a template for your business type
~6hDon't build from scratch. Search for 'SaaS financial model template' or 'marketplace financial model template' — CFI, Slidebean, and Taylor Davidson (foresight.is) all have excellent ones. Taylor Davidson's models are free and specifically designed for startups. Download, open in Google Sheets or Excel, and start filling in your assumptions.
Focus on assumptions, not formulas
~7.5hThe formulas in a template are already built. Your job is getting the assumptions right: customer acquisition cost, monthly churn rate, average revenue per user, gross margin. Research benchmarks for your industry — search 'SaaS benchmarks 2026' or look at public company filings. An unrealistic growth assumption is worse than a typo in a formula.
Build scenarios and stress-test
~9hCreate three scenarios: base case, upside, and downside. Vary your key assumptions (growth rate, churn, pricing) and see what breaks. Investors will ask 'what happens if growth is 50% slower?' — have the answer ready. Add a sensitivity table showing how revenue changes with different assumption combinations. This is what separates amateur models from impressive ones.
When to hire instead
You're raising $1M+ and need a model that can withstand due diligence from a VC analyst. Also hire for complex businesses with multiple revenue streams, marketplace dynamics, or regulated industries where the model needs to account for compliance costs. If an investor asks for a DCF valuation, that's when you call a professional.
No time? Skip to hiringReal talk
Most startup financial models are fiction — everyone knows this, including investors. What they really want to see is that you understand your unit economics and have thought critically about your assumptions. A DIY model built in Google Sheets with realistic, well-researched numbers beats a fancy Excel model with made-up hockey-stick projections. The math isn't hard. The thinking is.
Tools You'll Need
Hand-picked for this project. We only recommend tools we'd actually use.
Essential Tools
You need these to get started.
Claude Pro
$20/mo
Build financial model formulas, validate assumptions, and create sensitivity analyses. Claude catches formula errors.
Why we recommend it
Claude catches formula errors and validates financial assumptions — like having a CFO review your model for $20/mo.
Nice-to-Have Tools
Not required, but they make the job easier.
Notion
Free
Document your financial model assumptions, data sources, and methodology. Investors will ask why you chose specific numbers.
Why we recommend it
Document every assumption in your model — when an investor asks why 5 percent churn, you need to show reasoning.
Some links are affiliate links — we may earn a commission at no extra cost to you.
Our Verdict
Difficulty
hard
Learning time
15-40 hours
DIY cost
$0
Hire cost
$500-$10,000+
Choose DIY if...
- 2 of 2 tools are free
- You want to learn a new skill
- Budget matters more than time
Choose Hire if...
- The learning curve is steep
- You need professional-quality results
- Your time is worth more than the cost
- You have a tight deadline
Learn from video tutorials
Sometimes watching is easier than reading. Search for tutorials:
Join the conversation
See what other people are saying about doing this yourself:
Frequently Asked Questions
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Find a Financial Modeler pro on Fiverr
Skip the learning curve. Top-rated Financial Modeler freelancers start at $500-$10,000+.