Firewall for 50 Users: 7 Proven Sizing Rules and the Best Models to Shortlist

November 5, 2026

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Last updated: November 5, 2026

The right firewall for 50 users is the model whose threat-protection and TLS inspection throughput exceed your internet speed with room to spare, not the one with the biggest firewall number. In practice, a 1 Gbps office should shortlist models rated above 1.3 Gbps with security services running.

Jazz Cyber Shield is a US-based reseller of networking and cybersecurity hardware, and “what fits 50 people?” is a sizing question that headcount alone cannot answer. This guide gives you the missing details, a repeatable formula for choosing a firewall for 50 users, and verified specifications for current business firewalls from Fortinet, SonicWall and WatchGuard.

Key takeaways

User count alone cannot size a firewall for 50 users; link speed and inspection settings matter more.
Use protected throughput: threat protection, UTM or TLS figures, not raw firewall speed.
Full TLS inspection on a 1 Gbps line rules out every Gen 8 SonicWall TZ model listed here.
WatchGuard rates the Firebox M295 for up to 100 users, but the Firebox T145 stops at 25 mobile VPN tunnels.
Ports matter: a FortiGate 70G has 1 GbE ports only, so it cannot carry a 2 Gbps line on one port.

What Size Firewall Do 50 Users Need?

A firewall for 50 users usually sits in the desktop or entry 1U class, but the exact model depends on four numbers: internet speed, share of traffic you decrypt, remote VPN users and growth. Two offices with identical headcounts can need very different hardware.

Consider a law office on a 300 Mbps line with light cloud use, then a design studio on 2 Gbps fiber syncing large files to the cloud all day. Both might be shopping for a firewall for 50 users, yet the first can run comfortably on an entry model and the second needs multi-gigabit ports and far more inspection capacity.

Manufacturers rarely publish a simple user rating, which surprises many buyers. The Gen 8 SonicWall TZ datasheet copy we reviewed gives no recommended user count, and the Firebox T145 and T185 datasheets send you to a sizing tool instead. That tool, WatchGuard’s Product Sizing Tool does accept a user count, but it also asks for link speed plus branch and mobile VPN tunnels. Treat any “firewall for 50 users” label as a starting point, then test it against your own numbers.

How Do You Calculate a Firewall for 50 Users?

Multiply your internet speed by 1.3 to get a threat-protection target, then multiply it by the share of traffic you will decrypt and by 1.3 again to get a TLS target. Any model that clears both figures, plus your VPN count, goes on the shortlist.

The 1.3 multiplier is our planning rule, not a vendor specification. It keeps the box near 77% load at a full link, which stays under a useful warning line: Cisco Meraki’s MX sizing guide (September 2018 edition) advises considering a larger model when utilization stays above 85% during normal operation.

Threat target: link speed x 1.3.
TLS target: link speed x share of traffic decrypted x 1.3.
VPN target: peak remote users plus 25% growth, plus site-to-site tunnels.
Connection check: devices x estimated connections per device.

Here is a worked example. A 1 Gbps office decrypting 60% of its traffic needs 1.3 Gbps of threat protection and 780 Mbps of TLS inspection. That single calculation filters a firewall for 50 users faster than any brochure. Our throughput guide explains why these figures differ, in firewall throughput vs bandwidth sizing rules.

What Are the 7 Sizing Rules?

The seven rules below move from the biggest performance factors to the practical checks that catch expensive surprises. Apply them in order and most shortlists for a firewall for 50 users shrink to two or three models.

Rule 1: Why is headcount a weak way to size a firewall for 50 users?

Headcount hides devices and behavior. Meraki’s 2018 guide, for example, rated its MX67 and MX68 for 50 client devices, not 50 people, and warned that real performance varies with traffic mix and enabled features.

If each person has a laptop, phone and one other device, 50 users become 150 clients. Printers, cameras, phones and guest Wi-Fi add more. Count devices before you trust any marketing label on a firewall for 50 users.

Rule 2: Which throughput number should you use?

Use the figure measured with security services enabled. Fortinet’s October 2026 product matrix defines Threat Protection as firewall, IPS, application control and malware protection running together on Enterprise Mix traffic.

The gap is large. A FortiGate 70G is rated at 10 Gbps firewall throughput but 1.3 Gbps threat protection. Sizing a firewall for 50 users against the first number would overstate its protected capacity more than seven times over.

Rule 3: How much does TLS inspection change a firewall for 50 users?

TLS inspection is often the tightest limit. The firewall must act as an intermediary, decrypt the session, inspect it and re-encrypt it with its own certificate, so ratings drop sharply.

A Fortinet technical tip says deep inspection can significantly raise CPU and memory use, and recommends a gradual rollout and exempting trusted traffic. Plan that exemption list before sizing a firewall for 50 users, because it sets your decrypted share.

Rule 4: How many VPN users should you plan for?

Plan for peak remote use plus growth, not an average day. A snow day or office closure can turn a handful of remote workers into all 50 users at once.

This limit varies widely by model. A Firebox T145 lists 25 mobile VPN tunnels, while a Firebox T185 lists 100 and a FortiGate 70G lists 500 client-to-gateway IPsec tunnels. On SonicWall TZ models, the datasheet shows included and maximum figures, such as 5 (200) IPsec clients, so check what is licensed out of the box. A firewall for 50 users that cannot hold a full remote day is undersized, however fast it looks on paper.

Rule 5: Do you need more than 1 GbE ports?

You do if your internet line or core link runs above 1 Gbps. A throughput rating cannot help if the physical port is slower than the traffic you need to pass.

The FortiGate 50G, 60F and 70G list GE RJ45 ports only. The FortiGate 90G adds two 10GE shared port pairs, and the Firebox T145 includes one 2.5 GbE port and one SFP/SFP+ port. The Firebox T185 offers four 2.5 GbE ports plus one SFP/SFP+.

Rule 6: Are connection limits a real risk?

Plain connection limits are rarely the problem at this size, but TLS connection limits deserve a check. Take 150 devices and an assumed 200 connections each, and you reach 30,000 connections.

That is tiny against the 1,100,000 SPI connections of a SonicWall TZ380, yet it uses 75% of the 40,000 TLS connections in the Gen 8 TZ datasheet copy if everything is decrypted. Replace our assumption with your own data when you size a firewall for 50 users: SonicWall’s dashboard shows maximum, peak and current connections on existing units.

Rule 7: What about uptime and growth?

Decide this before you compare prices, because uptime needs can change the model class. The FortiGate 70G and 90G are listed as desktop units with a single AC supply (the 90G has dual inputs), while the FortiGate 120G is a 1 RU unit with dual AC supplies.

If a single failure would stop revenue, compare a redundant pair with one larger unit. Our guide to firewall high availability and failover design covers that decision. For growth, size a firewall for 50 users to the headcount and link speed you expect through the hardware’s service life, not to the day it ships.

Which Models Fit a Firewall for 50 Users?

The current models below all deserve a look for a firewall for 50 users, but they differ most on protected throughput, TLS capacity and VPN limits. Use the table to eliminate models, then confirm the current datasheet before you order.

Model	Threat / UTM	TLS or HTTPS inspection	Client VPN limit	Ports (summary)
FortiGate 50G	1.1 Gbps	1.3 Gbps	250	5 x GE
FortiGate 60F	700 Mbps	630 Mbps	500	10 x GE
FortiGate 70G	1.3 Gbps	1.4 Gbps	500	10 x GE
FortiGate 90G	2.2 Gbps	2.6 Gbps	2,500	8 x GE, 2 x 10GE shared pairs
FortiGate 120G	2.8 Gbps	3 Gbps	16,000	18 x GE, 8 x GE SFP, 4 x 10GE SFP+
SonicWall TZ280	1 Gbps	430 Mbps	5 (200)	8 x 1 GbE, 2 x 1G SFP
SonicWall TZ380	1.5 Gbps	600 Mbps	5 (200)	8 x 1 GbE, 2 x 5G SFP+
SonicWall TZ480	2 Gbps	650 Mbps	5 (200)	8 x 1 GbE, 2 x 5G SFP+
SonicWall TZ680	2.5 Gbps	800 Mbps	10 (500)	8 x 1 GbE, 2 x 10G SFP
WatchGuard T145	710 Mbps	380 Mbps	25	1 x 2.5 GbE, 4 x 1 GbE, 1 x SFP/SFP+
WatchGuard T185	1.83 Gbps	1.00 Gbps	100	4 x 2.5 GbE, 4 x 1 GbE, 1 x SFP/SFP+
WatchGuard M295	1.85 Gbps	1.12 Gbps	100	4 x 2.5 GbE, 4 x 1 GbE, 2 x SFP+

Figures come from the Fortinet product matrix (October 2026), SonicWall’s entry-level firewall page and a reseller-hosted Gen 8 datasheet, plus reseller-hosted WatchGuard datasheets tested on Fireware 2025.1. Vendors test differently, so treat cross-brand gaps as a guide, not a benchmark. The SonicWall bracket shows included (maximum) clients.

Fortinet: which FortiGate suits 50 users?

The FortiGate 70G is the balanced choice for a firewall for 50 users. It carries 1.3 Gbps of threat protection, 1.4 Gbps of SSL inspection and 1.4 million sessions, while the older 60F now trails the smaller 50G on inspection. Browse the Fortinet firewall range, or read our FortiGate buying guide for wider context.

SonicWall: which TZ suits 50 users?

As a firewall for 50 users, the TZ380 and TZ480 suit offices that use selective decryption. Their threat figures are strong for the class, but TLS ratings of 600 and 650 Mbps need honest planning if you decrypt most traffic. See the SonicWall firewall lineup for available models.

WatchGuard: which Firebox is a firewall for 50 users?

The T185 and M295 are the stronger fits. The M295 datasheet says it supports up to 100 users, which leaves a clear growth margin, and our WatchGuard T125 vs T145 comparison covers the tabletop tier below it. Current options sit in our WatchGuard firewall category.

Which Firewall Fits Your Office Scenario?

Match your link speed and decryption plan to the closest row below. Each row applies the formula above to the verified figures in the comparison table, so you can see why a firewall for 50 users changes with the job.

Scenario	Targets	Models that clear it	Models that miss
300 Mbps, no TLS decryption	390 Mbps threat	FortiGate 50G, TZ280, T145	None in this table
1 Gbps, 60% decrypted	1.3 Gbps threat, 780 Mbps TLS	FortiGate 70G, TZ680, T185, M295	FortiGate 50G, TZ480, T145
1 Gbps, 100% decrypted	1.3 Gbps threat, 1.3 Gbps TLS	FortiGate 70G, FortiGate 90G	All TZ models listed, T185, M295
2 Gbps, no TLS decryption	2.6 Gbps threat	FortiGate 120G (2.8 Gbps)	FortiGate 90G (2.2 Gbps), TZ680 (2.5 Gbps), T185, M295

Two results stand out. First, full decryption on a 1 Gbps line pushes you well past the TZ range, so narrowing what you decrypt can save a model tier. Second, the 70G clears the 1 Gbps full-decryption row with little margin, so a firewall for 50 users in that row should be the 90G if you expect a faster line.

Scenario targets use the same 1.3 multiplier throughout. If your budget forces a tighter margin on a firewall for 50 users, shrink the decrypted share with exemptions rather than dropping security services.

What Mistakes Make Firewalls Undersized?

Most undersized firewalls come from comparing the wrong data, not from choosing a bad brand. These are the errors worth checking before you approve a firewall for 50 users.

Buying on the headline number. Raw firewall throughput ignores the security services you are paying for.
Ignoring decryption. Adding TLS inspection after deployment can cut usable capacity far below the threat figure.
Counting staff, not devices. Phones, cameras and guest Wi-Fi all create connections.
Using today’s link speed. A planned circuit upgrade can outrun a box bought for the old line.
Assuming VPN capacity is included. Check both the included and maximum licence figures.
Skipping port checks. SFP-based uplinks may also need the right transceivers, so confirm compatibility.
Forgetting managed access points. The TZ380 lists 16 supported access points, while the TZ480 lists 32.
Budgeting hardware only. Security services require a subscription term, so price renewals with the firewall.

What Should You Collect Before Requesting a Quote?

Gather six facts and a reseller can give you a precise recommendation in one pass. A short checklist also makes a firewall for 50 users easy to compare across brands.

Measure the link. Record current download and upload speeds, plus any upgrade planned in the next three years.
Count devices. List wired, wireless, guest and IoT devices, not only employees.
Set your inspection policy. Decide what you will decrypt and exempt, such as banking or health sites where your policy requires it.
Find your VPN peak. Note the largest number of remote users you must support at once, plus any branch tunnels.
Check existing data. Export peak throughput and peak connections from your current firewall if it reports them.
Define uptime needs. Decide whether one unit is enough, or whether you need dual power or a failover pair.

With those six inputs, the formula above takes minutes. It also keeps every vendor quote comparable, because each bid must meet the same stated targets.

How Do You Test a Firewall for 50 Users After Installation?

Test it under real load with every planned security service switched on. A firewall for 50 users that passes a quiet evening speed test can still struggle at 10 a.m. on a busy Monday.

Baseline first. Record a speed test from a wired client before you enable inspection.
Enable services in stages. Turn on IPS, application control and malware protection, then TLS inspection, and retest after each step.
Watch the peak. Review CPU, memory and connection counts during the busiest business hours for at least a week.
Test remote access. Connect your expected VPN peak, or as close to it as you can arrange, during a planned window.

Keep those results on file. If sustained load keeps climbing toward the 85% warning line mentioned earlier, you will have evidence for a larger firewall for 50 users or a tighter decryption policy before staff feel the slowdown.

Frequently Asked Questions

What is the best firewall for 50 users?

There is no single best model, because internet speed and TLS decryption decide the fit. For a 1 Gbps office decrypting part of its traffic, the FortiGate 70G, SonicWall TZ680, WatchGuard T185 and WatchGuard M295 all clear our sizing targets.

Is a FortiGate 60F enough for 50 users?

It can be on a line up to about 500 Mbps with limited decryption, since it is rated at 700 Mbps threat protection and 630 Mbps SSL inspection. On a 1 Gbps line, the FortiGate 70G is the safer choice.

How much throughput does a firewall for 50 users need?

Plan for about 1.3 times your internet speed with security services on. A 500 Mbps line therefore needs roughly 650 Mbps of threat-protection throughput, and you should apply the same logic to the decrypted share of traffic.

How many VPN tunnels should a 50-user office buy?

Size for the most people who could work remotely at once, plus about 25% growth. If all 50 people may work from home during a closure, avoid models with lower limits, such as the 25 mobile VPN tunnels on a Firebox T145.

Do I need a rack-mount firewall for 50 users?

Not necessarily, because many models at this level are desktop units. The FortiGate 70G and 90G and the Gen 8 TZ models are listed as desktop, while the FortiGate 120G is a 1 RU unit with dual AC supplies.

Does a firewall need a subscription to protect 50 users?

The throughput figures that matter assume security services are running, and those services generally depend on an active subscription. Include the bundle and its renewal term in your budget, and confirm exactly what each brand’s package covers.

Where Can You Buy the Right Firewall?

Start with your link speed, decrypted share and VPN peak, then shortlist from our firewalls category, which covers Fortinet, SonicWall and WatchGuard hardware. The right firewall for 50 users is the one that keeps security on at full speed.

Buying for a project or several sites? Jazz Cyber Shield can quote bulk and project orders. Send your six inputs through the Jazz Cyber Shield firewall store and request a quote for the shortlisted models.