Total addressable market (TAM) is the yearly revenue you would earn if every company that could use your product bought it at your real price. Calculate it bottom-up: count the units your pricing charges for (companies, locations or users) from a primary source, then multiply by what one unit pays you a year.
Below you get the TAM formula for each pricing model, a six-step method, and a worked example on US staffing agencies where the choice of unit moves the answer from 33.6 million to 5.1 billion USD.
What is total addressable market?
Total addressable market (TAM) is the total annual revenue available to your product if you won every customer that has the problem it solves, at the price you charge today. It is a ceiling, not a forecast: nobody wins 100% of a market.
TAM is the outer of three nested numbers. SAM is the part you can serve today and SOM is what your team can win in a year; our TAM, SAM and SOM guide covers all three with formulas. This page goes deep on the first number, because every other number is cut from it.
The total addressable market formula
The total addressable market formula is units × annual price per unit, where the unit is whatever your pricing charges for. Pick the wrong unit and the result can be off by a factor of 25 or more.
| You charge per | Unit to count | TAM formula | Where to count it (US) |
|---|---|---|---|
| Company | Firms | firms × ACV | Census SUSB, firms |
| Location | Offices, sites, plants | locations × yearly price per location | Census SUSB, establishments |
| Seat | Users with the job title | users × yearly seat price | A people count for the title |
| Usage | Firms × yearly volume | firms × units per year × unit price | Census firms + your usage data |
ACV is annual contract value: what one customer pays you per year. If your price changes with company size, run the formula once per size band and add the bands.
Top-down, bottom-up or value theory: which TAM method to use
Use bottom-up to calculate TAM, top-down to check its order of magnitude, and value theory to test your price. Each method answers a different question.
| Method | Starts from | Use it for | Weak spot |
|---|---|---|---|
| Top-down | An analyst’s market size | A sanity check | The report’s category rarely matches your buyer |
| Bottom-up | A count of units × your price | The number you plan with | Only as good as the unit and the source |
| Value theory | The value you create per customer | Setting and defending price | Still needs a unit count underneath |
Bottom-up is the only one of the three that ends with a list of real companies and people. That list is what your team works from on Monday.
How to calculate total addressable market bottom-up
Calculating total addressable market bottom-up takes six steps and one spreadsheet. Most of the work is in steps 1 and 4, where the unit and the size measure get decided.
1. Pick the unit your pricing charges for
Write down what one invoice line is: a company, a site, a seat or a volume (placements, endpoints, calls). Then write the buyer in one sentence. If you do not have that sentence yet, start from an ideal customer profile template.
2. Find the industry codes that hold your buyers
US government data groups companies by NAICS code (North American Industry Classification System). Include every code whose companies have the problem. Leave out look-alike codes whose companies do not buy what you sell, and write down why.
3. Pull firm and location counts from Census SUSB
The Census Bureau’s Statistics of U.S. Businesses (SUSB) counts employer firms and their establishments by NAICS code, state and employee size. The 2022 tables, released in April 2025, are the latest.
Use the Firms column if you sell per company and the Establishments column if you sell per location. The SUSB glossary defines an establishment as a single physical location.
4. Check that “employees” measures what you think
SUSB sizes a firm by everyone on its payroll across all locations. In most industries that tracks the buyer’s size. In some it does not: staffing agencies carry their placed workers on payroll, so a 12-recruiter agency can show up as a 300-employee firm.
If you price per seat, skip employee counts entirely and count the users by job title.
5. Set a price you can defend
Use the price customers sign today, or the price your pilots agreed to. If your price rises with company size, set one price per size band.
6. Multiply, add the bands, then cross-check
Multiply units by price and add the bands. Then compare your unit count with a second source, such as an industry association. Within about 10% is a good sign. Off by 3x means the unit or the codes are wrong.
Total addressable market example: software for US staffing agencies
Here is the method on a real market. Shiftbridge is a fictional Denver, Colorado startup selling an interview-scheduling and candidate-texting tool to staffing agencies at 100 USD per recruiter seat per month (1,200 USD a year, an example input). The counts are real.
The codes: three staffing industries in, one left out
| NAICS code | Industry | US firms (2022) | Offices (2022) |
|---|---|---|---|
| 561311 | Employment placement agencies | 6,277 | 7,030 |
| 561312 | Executive search services | 5,945 | 6,242 |
| 561320 | Temporary help services | 15,768 | 39,366 |
| Total | 27,990 | 52,638 |
Source: US Census Bureau, SUSB 2022.
Shiftbridge leaves out code 561330, professional employer organizations (2,959 firms): they run payroll and HR for clients, they do not recruit. A firm with offices in two codes is counted in both, so the true total is slightly under 28,000.
The cross-check holds. The American Staffing Association counts around 27,000 staffing and recruiting companies running close to 54,000 offices (2021 data). Two sources, two methods, within 4% of each other.
The trap: Census employees include the temps
Temporary help firms average 249 employees each. The NAICS definition explains why: the workers placed with clients are “employees of the temporary help service establishment” (NAICS 2022, 561320). Executive search firms, which place people but do not employ them, average 8.
Across the three codes, 4.2 million people are on the payroll. Almost all of them are placed workers, not recruiters, and none of them will ever log in to Shiftbridge.
The seats: count the recruiters
On 27 September 2026, a Scalelist people count for six recruiter titles at US staffing and recruiting companies returned 161,092 profiles: over 161,000 recruiters, about 6 per firm. That is the unit Shiftbridge charges for.
Three TAMs from one price
| Unit counted | Count | × 1,200 USD a year | Right for Shiftbridge? |
|---|---|---|---|
| Firms (one seat each) | 27,990 | 33.6 million USD | No: most agencies have several recruiters |
| Recruiters (seats) | 161,092 | 193.3 million USD | Yes: it matches the pricing |
| Census employees | 4,247,983 | 5.1 billion USD | No: it counts the temps |
Shiftbridge’s total addressable market is about 193 million USD a year. The Census-employee version is 26 times bigger and would not survive the first question from an investor who knows staffing.
Where the seats sit
Split by company size, 41% of the seats (66,758 recruiters, 80.1 million USD of TAM) sit at companies listed with more than 200 employees. Those agencies buy after longer evaluations, so the split matters more for SAM than for TAM. Our guide to B2B market segmentation shows how to rank those groups.
Calculate your own TAM
Copy these eight lines into a spreadsheet. Lines 6 and 8 are formulas; every other line needs a source and a date.
2. NAICS codes included, and codes left out with the reason: ____
3. Units counted: ____ Source and date: ____
4. Does the size measure count your real users? (yes / no, why): ____
5. Yearly price per unit (signed, quoted or piloted): ____ USD
6. TAM = line 3 x line 5 = ____ USD a year
7. Second source for the unit count (association, registry, analyst): ____
8. Gap between line 3 and line 7: ____ % (over 20%: recheck lines 1 to 3)
Count the users or buyers in your market for free: describe them in one sentence and see how many match before you spend a credit.
Describe your buyer in one sentenceCommon TAM mistakes (and the fix)
Four mistakes inflate most TAM slides. Each one has a fix you can apply in minutes.
Counting every business in the US
The SBA counts 36.2 million US small businesses, but 82.3% of them have no employees (SBA Office of Advocacy, 2026). Fix: start from the 6,395,635 employer firms in SUSB 2022, then narrow by industry and size.
Counting locations as companies
SUSB 2022 shows 8,298,562 establishments but 6,395,635 firms. Fix: count establishments only if you price per location; otherwise count firms.
Using an analyst’s market size as your TAM
For 2026, Mordor Intelligence puts the global sales intelligence market at 4.99 billion USD and Fortune Business Insights at 5.37 billion USD. Same market, same year, 380 million USD apart. Fix: build TAM bottom-up and quote analysts only as a cross-check, with the firm’s name and year.
Pricing the TAM at a price nobody has paid
A TAM at your target price is a wish. Fix: use signed or quoted prices, and if you have none, show the TAM at your pilot price and at your list price side by side.
How to present TAM in a pitch deck or plan
A TAM slide is credible when a reader can redo the math: the unit, the count with its source, the price and the result on one line each.
- Put the unit in the headline (“161,000 recruiters”), not only the dollar figure.
- Show the formula with the real numbers, not just the result.
- Put a source and a date under every count.
- Add one cross-check from a second source.
- Follow with the SAM and SOM on the next slide, so the reader sees where you start.
What to look for in a tool to count your market
A market count needs two kinds of source: one for companies and one for people. When you pick them, check that:
- Company counts come from a primary source you can cite, such as Census SUSB, not a vendor’s “companies in our database”.
- The people count is shown at no cost, before you pay for any contact.
- The tool understands title, industry, company size and location from a plain description and shows what it understood.
- The same tool returns verified work emails and mobile numbers when you move from TAM to a target account list.
Company size and industry are firmographic data, so any market you can describe that way can be counted.
How Scalelist helps you count TAM in users and buyers
Scalelist, an AI Lead Finder, gives you the seat and buyer counts that Census tables cannot, at no cost, then turns the part of the market you pick into named contacts with verified work emails and mobile numbers.
You describe the people in one sentence. Scalelist’s Lead Finder shows what it understood and how many people match before you spend a credit. Writing that sentence well is the whole skill.
For Shiftbridge, the buyer is the agency owner, not the recruiter. On 27 September 2026, owners and C-level leaders at US staffing and recruiting companies with 11 to 50 employees matched 9,724 people.
A first campaign to 400 of them costs at most 8,800 credits: 1 per lead, 1 per email and 20 per mobile found, 0 for a miss. That fits the Scaler 10K plan at 349 USD a month (see Scalelist pricing).
Scalelist finds and verifies contact details on demand rather than serving a pre-compiled list. For ready-made examples of this buyer, see our ICP examples for staffing and three other industries.
Size your market for free, then reveal verified emails and mobiles only for the buyers you keep.
Get 20 credits to test itFAQ
What is total addressable market in simple terms?
Total addressable market is the most revenue your product could earn in a year if every company with the problem bought it at your current price. It is a ceiling, not a forecast. In B2B, write it as a count of units (companies, locations or users) and as dollars, so anyone can check the math.
How do you calculate total addressable market?
Multiply the number of units you charge for by the yearly price of one unit. Count companies or locations from a primary source such as the US Census Statistics of U.S. Businesses, or count users by job title if you price per seat. Use your real price, add the size bands, and cross-check the count against a second source.
What is the difference between TAM and SAM?
TAM is every account or user that has the problem you solve. SAM, the serviceable addressable market, is the part your product, price and sales channel can serve today. SAM is always a subset of TAM. In the staffing example, the TAM counts all 161,000+ recruiters; a SAM might keep only agencies with 11 to 200 employees.
Should TAM include companies you cannot sell to yet?
Yes. TAM includes every company or user that has the problem, even if your product cannot serve them today. The ones you cannot serve yet fall outside your SAM, not your TAM. Keeping them in TAM shows how much room the product has to grow as you add features or channels.
Is TAM measured in revenue or in number of customers?
Both. The dollar figure is units times price, but the unit count is what makes it checkable and useful. A slide that says “161,000 recruiters at 27,990 agencies, 1,200 USD per seat, 193 million USD a year” can be verified line by line. “A 193 million USD market” alone cannot.
Where can I find how many companies are in an industry?
For US companies, use the Census Bureau’s Statistics of U.S. Businesses (SUSB). It counts employer firms and establishments by NAICS industry code, state and employee size, and the 2022 tables are the latest. Industry associations publish their own counts, which make a good cross-check. For people inside those companies, use a people count by job title.
How often should you update your TAM?
Once a year, and every time your pricing model changes, because a new unit means a new count. A switch from per-company to per-seat pricing can move TAM several times over, as the staffing example shows. Census business counts lag by about two to three years; people counts move monthly, so date each one.
Does Scalelist charge to count a total addressable market?
No. Sizing a search in Scalelist is free: you see how many people match before you spend a credit. Credits are charged only when something is found: 1 per lead, 1 per email and 20 per mobile number. A miss costs 0, and new accounts get 20 free credits with no credit card required.
Sources
- US Census Bureau: 2022 SUSB annual data tables
- US Census Bureau: SUSB 2022, US and states by detailed employment size (xlsx)
- US Census Bureau: SUSB glossary
- Statistics Canada: NAICS 2022, 561320 Temporary help services
- American Staffing Association: staffing industry statistics
- SBA Office of Advocacy: Frequently Asked Questions About Small Business 2026
- Mordor Intelligence: sales intelligence market
- Fortune Business Insights: sales intelligence market
- Scalelist people count (POST /api/v1/people/count), queried 27 September 2026, 0 credits.
