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Free market sizing tool

Calculate your TAM, SAM & SOM

Size your total addressable market using bottom-up methodology. Get defensible numbers for investor decks, board presentations, and go-to-market planning.

1
Industry & Geo
2
Filtering
3
Deal Economics
4
Penetration
Step 1 of 4

Industry & Geography

What industry are you targeting?
What is your primary geography?
How many companies exist in your total target market?
This is the broadest count: every company that could theoretically buy your product, across all segments and regions.
Don't know this number? See guidance ↓
How to estimate total companies:
  • SaaS: ~30,000 SaaS companies globally. US only: ~15,000. UK: ~3,000.
  • Fintech: ~26,000 globally. US: ~10,000. UK: ~2,500. Europe: ~9,000.
  • Healthcare: ~800,000 healthcare orgs in the US. UK: ~50,000. Digital health startups globally: ~10,000.
  • Professional Services: ~1.2M firms in the US. UK: ~400,000. Consulting firms specifically: ~700,000 US.
  • Manufacturing: ~250,000 manufacturers in the US. UK: ~130,000. Germany: ~45,000.
Use LinkedIn Sales Navigator, Crunchbase, or government business registries to get a more precise count for your specific niche.
Step 2 of 4

Market Filtering

What company sizes do you sell to?
Select all that apply. This narrows your TAM to your SAM.
What annual revenue range do your target companies have?
Select all that apply.
Any specific technology requirements? (optional)
e.g. "Must use Salesforce" or "AWS infrastructure". Leave blank if not applicable.
Step 3 of 4

Deal Economics

What is your average annual contract value (ACV)?
The average amount a customer pays you per year.
$
Average sales cycle length (months)
From first touch to closed deal. This affects your year 1 projections.
Estimated close rate on qualified opportunities (%)
What percentage of qualified pipeline do you typically convert? B2B average is 20-30%.
%
Step 4 of 4

Market Penetration

Current market share estimate (%)
What percentage of your SAM do you currently own? Enter 0 if you are pre-revenue or just entering this market.
%
Realistic year 1 market penetration target (%)
What percentage of your SAM can you realistically win in the first 12 months? Most B2B companies target 1-5% in year one.
%

Your Market Size

Bottom-up TAM/SAM/SOM based on your inputs

TAM
Total Addressable Market
$0
SAM
Serviceable Addressable Market
$0
SOM
Serviceable Obtainable Market
$0

Market Funnel

TAM $0
SAM $0
SOM $0

How we calculated each number

Metric Calculation Result

What this means

Revenue Projections

Year 1
$0
0 deals
Year 2
$0
0 deals
Year 3
$0
0 deals

Want research-backed market sizing instead of estimates?

Our research team builds defensible TAM/SAM/SOM models using real firmographic data, competitive mapping, and validated assumptions. No guesswork.

See ORRJO Intelligence → Talk to our research team →
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Frequently Asked Questions

What is TAM (Total Addressable Market)?

TAM represents the total revenue opportunity available if your product or service achieved 100% market share. It is the broadest measure of market size, counting every potential customer across all geographies and segments without any practical constraints. TAM is useful for understanding the overall opportunity but should never be confused with realistic revenue targets.

What is the difference between SAM and SOM?

SAM (Serviceable Addressable Market) is the portion of TAM that your company can actually reach and serve, filtered by geography, company size, revenue, and product fit. SOM (Serviceable Obtainable Market) goes one step further: it is the share of SAM you can realistically capture in a given timeframe, factoring in your sales capacity, brand awareness, and competitive position. SAM tells you the size of your playing field. SOM tells you how much of it you can win.

Why use bottom-up instead of top-down market sizing?

Bottom-up market sizing starts with countable, verifiable data: the number of companies in your target segments and what they will pay. Top-down starts with total industry revenue and applies percentage-based assumptions to work backwards. Bottom-up produces more credible figures for investor presentations and internal planning because every number traces back to a real data point. Top-down is easier but often inflates the opportunity.

How accurate is this calculator?

This calculator gives you a structured framework and directional estimates based on the numbers you provide. The accuracy depends entirely on the quality of your inputs. For investor-grade market sizing, you need primary research, validated firmographic data, and competitive analysis to pressure-test each assumption. That is exactly what our research team delivers through ORRJO Intelligence.

What is a realistic SOM for a B2B startup?

Most B2B startups target 1-5% of their SAM in year one. Companies with strong brand recognition, existing customer bases, or differentiated products might push toward 5-10%. Anything above 10% in year one requires either a very small SAM or a truly dominant position. The key is being honest with yourself about sales capacity, competitive intensity, and how long your sales cycle actually takes.