TAM SAM SOM Calculator
Size your market from the bottom up.
Enter your values
Enter the total potential customers you are working with.
Enter the annual revenue per customer in $.
Enter the serviceable share in %.
Enter the obtainable share of sam in %.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- SOM (realistic)
- $1,200,000.00
- TAM
- $120,000,000.00
- SAM
- $30,000,000.00
- Customers in SOM
- 2,500
Quick answer
TAM is the whole market, SAM the part you can serve, SOM the share you can realistically win.
TAM = customers × annual revenue per customer
At a glance
| What it does | Size your market from the bottom up. |
|---|---|
| Category | Business |
| Inputs needed | Total potential customers, Annual revenue per customer, Serviceable share, Obtainable share of SAM |
| Main output | SOM (realistic) |
| Formula | TAM = customers × annual revenue per customer |
| Cost | Free — no sign-up, no download |
How to use the TAM SAM SOM Calculator
- 1Estimate total potential customers.
- 2Enter annual revenue per customer.
- 3Set the shares you can serve and win.
Inputs explained
- Total potential customers
- Enter the total potential customers you are working with.
- Annual revenue per customer($)
- Enter the annual revenue per customer in $.
- Serviceable share(%)
- Enter the serviceable share in %.
- Obtainable share of SAM(%)
- Enter the obtainable share of sam in %.
Worked example
Using the values the calculator loads with:
Inputs
- Total potential customers250000
- Annual revenue per customer480 $
- Serviceable share25 %
- Obtainable share of SAM4 %
Results
- SOM (realistic)$1,200,000.00
- TAM$120,000,000.00
- SAM$30,000,000.00
- Customers in SOM2,500
Frequently asked questions
Why bottom-up?
Investors distrust top-down 'if we get 1% of a billion' claims.
What SOM is credible?
1–5% of SAM within three years for a new entrant.
What do I need to enter into the TAM SAM SOM Calculator?
Just 4 values: total potential customers, annual revenue per customer, serviceable share, obtainable share of sam. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the TAM SAM SOM Calculator work out the answer?
TAM is the whole market, SAM the part you can serve, SOM the share you can realistically win. It applies the formula TAM = customers × annual revenue per customer and shows the working so you can check each step by hand.
Is the TAM SAM SOM Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.