Free TAM calculator for B2B companies selling to US small businesses
By Ryan Doyle, co-founder of Sales.co. Published November 14, 2026.
Your TAM (total addressable market) is the number of businesses that could buy from you times what one pays you a year. At $3,000 a year, the 135,665 US dental offices are a $407.0 million market. If you sell to US small businesses, pick an industry and a state below and enter your contract value.
The calculator takes the Census count of every location with paid staff, then shows the part you can reach by email and what one cold email sequence to all of them would return at Sales.co's all-client reply rate.
0.195% is Sales.co's measured rate across 1,160,878 recipients. The close rate is your own guess.
TAM: $407.0 million a year = 135,665 Census establishments in the US (offices of dentists, NAICS 621210, 2023) x $3,000 a year per customer. A floor: businesses with no paid staff are not in the Census count.
Reachable by email: 44,420 with an address on file at Sales.co ($133.3 million a year at the same price), 33 per 100 Census establishments. Median across the 29 industries here: 22 per 100.
One full sequence (first email plus follow-ups) to all 44,420: about 87 interested replies and 299 replies of any kind at Sales.co's all-client average (not a rate for this industry), then 8.7 customers and about $26,000 in first-year revenue if 10% of interested replies buy.
Cite this: Sales.co, "B2B TAM calculator", https://sales.co/tam-calculator, Census County Business Patterns 2023, Sales.co list counts of November 12, 2026 and reply rates across 1,160,878 recipients (October 6, 2025 to October 25, 2026).
What the numbers show
- The 33 industries here hold 3,154,492 US establishments with paid staff (Census 2023; plumbers and HVAC contractors share one Census code, so that count appears twice). Restaurants are the largest at 618,476.
- Sales.co has a median 22 contacts on file per 100 Census establishments across 29 industries, from 6 for auto repair shops to 97 for roofers. The two counts measure different things (the Census leaves out businesses with no payroll, the lists include them), so in some states the email count is higher than the Census count.
- A full sequence to every dental office on file (44,420 contacts) would bring about 87 interested replies at 0.195% per contact, Sales.co's average across all clients and industries. The largest market here, 54,435 restaurants on file, would bring about 106. Even a big TAM turns into about a hundred interested conversations per pass.
- Across 1,160,878 recipients, 0.673% replied at all and 0.195% replied with interest, counting the first email and every follow-up.
Dental office TAM at four contract values
US totals, all states; customers and revenue assume 10% of interested replies buy.
| Contract value a year | TAM (135,665 establishments) | Reachable by email (44,420) | Customers from one sequence | First-year revenue |
|---|---|---|---|---|
| $1,000 | $135.7 million | $44.4 million | 8.7 | about $8,700 |
| $3,000 | $407.0 million | $133.3 million | 8.7 | about $26,000 |
| $10,000 | $1.4 billion | $444.2 million | 8.7 | about $87,000 |
| $25,000 | $3.4 billion | $1.1 billion | 8.7 | about $217,000 |
Every industry at $3,000 a year
| Industry | Census establishments, 2023 | TAM at $3,000 | Contacts on file | Interested replies, one sequence |
|---|---|---|---|---|
| Restaurants | 618,476 | $1.9 billion | 54,435 | 106 |
| General Contractors | 254,630 | $763.9 million | 40,849 | 80 |
| Churches | 186,801 | $560.4 million | 33,298 | 65 |
| Trucking Companies | 170,286 | $510.9 million | not published | |
| Auto Repair Shops | 169,572 | $508.7 million | 10,688 | 21 |
| Realtors | 163,894 | $491.7 million | 52,468 | 102 |
| Accountants | 137,069 | $411.2 million | 22,932 | 45 |
| Dentists | 135,665 | $407.0 million | 44,420 | 87 |
| Insurance Agents | 133,728 | $401.2 million | 32,019 | 62 |
| Landscapers | 117,969 | $353.9 million | 26,006 | 51 |
| Plumbers | 111,207 | $333.6 million | 23,832 | 46 |
| HVAC Contractors | 111,207 | $333.6 million | 35,374 | 69 |
| Hair Salons | 84,176 | $252.5 million | 39,163 | 76 |
| Electricians | 83,342 | $250.0 million | 12,310 | 24 |
| Preschools and Day Care Centers | 82,162 | $246.5 million | 5,692 | 11 |
| Cleaning Companies | 67,799 | $203.4 million | 6,234 | 12 |
| Property Managers | 60,818 | $182.5 million | 6,931 | 14 |
| Hotels | 55,895 | $167.7 million | 6,133 | 12 |
| Physical Therapists | 52,058 | $156.2 million | not published | |
| Car Dealerships | 47,057 | $141.2 million | 8,618 | 17 |
| Gyms | 41,556 | $124.7 million | 6,291 | 12 |
| Chiropractors | 39,913 | $119.7 million | 14,977 | 29 |
| Marketing Agencies | 38,864 | $116.6 million | 6,049 | 12 |
| Veterinarians | 34,296 | $102.9 million | not published | |
| Roofers | 25,519 | $76.6 million | 24,758 | 48 |
| Financial Advisors | 23,359 | $70.1 million | 21,133 | 41 |
| Architects | 22,805 | $68.4 million | 9,521 | 19 |
| Optometrists | 22,501 | $67.5 million | 8,349 | 16 |
| Interior Designers | 16,797 | $50.4 million | 12,080 | 24 |
| Pest Control Companies | 16,535 | $49.6 million | 7,060 | 14 |
| Mortgage Brokers | 9,792 | $29.4 million | not published | |
| Moving Companies | 9,436 | $28.3 million | 8,424 | 16 |
| Travel Agents | 9,308 | $27.9 million | 7,939 | 15 |
Census: establishments with paid employees, sum of the 50 states and DC. Contacts: businesses with an email address on file at Sales.co, counted November 12, 2026; lists under 5,000 records publish no count. Interested replies: contacts x 0.195%.
Worked example: software for dental offices
Say you sell scheduling software to dental offices at $3,000 a year. The Census counts 135,665 dental offices with paid staff, so the TAM is 135,665 x $3,000 = $407.0 million a year. Sales.co has 44,420 of them with an email address, $133.3 million of that market. One full sequence to all of them at 0.195% gives about 87 interested replies; if 10% buy, that is 8.7 customers and about $26,000 in the first year. The same math works for any industry in the list: change the inputs above.
Method
- TAM = Census establishments x your yearly contract value. Establishments come from the 2023 County Business Patterns state file (cbp23st.txt, 2025-05-29, column est, all legal forms), matched to each list by the narrowest NAICS code that covers it. One-person businesses with no payroll are not counted, so the TAM is a floor for trades with many sole owners.
- Reachable by email = businesses in the list's categories with an email address on file in Sales.co's business database, per state, counted November 12, 2026.
- Replies = reachable contacts x a rate per recipient. Sales.co's rates count each recipient once across the whole sequence: 0.673% sent a human reply (not an auto-reply, bounce or out-of-office) and 0.195% sent one the sending tool labeled interested, 1,160,878 recipients in 58 sending workspaces, emails from October 6, 2025 to October 25, 2026, replies counted for 14 days, no single workspace over 45% of a figure.
- Customers = interested replies x the share you enter. First-year revenue = customers x contract value. The reply rate is an average over many offers and industries; yours will be higher or lower. Contacts on file are not all verified, so some addresses will bounce, which the per-recipient rate partly reflects.
- Every one of the 33 industries has a Census count in all 50 states and DC, so no state is blank.
What to do with the result
If the reachable part is large and one sequence returns enough customers to matter, cold email can carry the market: buy the list once (every Sales.co email list is $295, no subscription) or have Sales.co run the campaign ($2,000 a month for up to 10,000 emails). If one sequence returns too few customers, raise the contract value with a bigger offer, add channels, or pick a larger industry. For the reply side of the math, see the lead generation calculator; for counts alone, the business count lookup.
Sources
- US Census Bureau, 2023 County Business Patterns, state file: www2.census.gov/programs-surveys/cbp/datasets/2023/cbp23st.zip, downloaded October 30, 2026.
- US Census Bureau, About County Business Patterns (establishments with paid employees), read October 30, 2026.
- Sales.co sending database: reply rates per recipient across the sequence, computed November 9, 2026 (see the cold email response rate study).
- Sales.co list counts, counted November 12, 2026; prices from sales.co/email-lists and sales.co/pricing, read November 14, 2026.
FAQ
What is TAM?
Total addressable market: what you would earn in a year if every business that could buy from you did. Bottom up, it is the number of possible customers times what one pays you a year. 135,665 dental offices at $3,000 a year is a $407.0 million TAM.
How do you calculate TAM for a B2B product?
Count the businesses that fit, then multiply by your average contract value. This calculator takes the count from the Census Bureau's County Business Patterns (every US location with a payroll, by industry and state) so you do not have to estimate it, and you enter the contract value.
What is the difference between TAM, SAM and SOM?
TAM is every possible customer. SAM (serviceable available market) is the part you can actually serve or reach; here it is the businesses with an email address on file, since that is who a cold email campaign can contact. SOM (serviceable obtainable market) is what you can realistically win soon; here it is the customers one full email sequence would produce at the close rate you enter.
Where do the reply rates come from?
From Sales.co's sending data: 1,160,878 recipients emailed between October 6, 2025 and October 25, 2026 across 58 sending workspaces. 0.673% replied (a person, not an auto-reply) and 0.195% sent a reply the sending tool labeled interested, counting the first email and every follow-up. Your rate depends on your offer and copy, so the field can be changed.
Why do the Census count and the contacts on file differ?
They count different things. The Census counts every location with paid employees, published email address or not, and leaves out businesses with no payroll, so the TAM here is a floor. Sales.co counts businesses with a public listing and an email address, sole owners included, so in some states (roofers in Texas, for one) the email count is the higher of the two. Across the 29 industries with both numbers, the median is 22 contacts per 100 establishments, from 6 for auto repair shops to 97 for roofers.
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