This guide is reviewed by the SureTel Network Engineering Team, with over 15 years of experience designing business connectivity solutions across South Africa. Bandwidth recommendations are based on real-world deployments and application testing.
Last Updated: March 2026
What Uses Internet Bandwidth in a Business?
Before choosing an internet speed, you need to understand what actually consumes bandwidth in a typical business environment. Most organisations underestimate how many applications compete for the same connection simultaneously.
Email & Basic Browsing
Email, web browsing, and basic online research are the lightest bandwidth consumers. Each user typically requires only 1–2 Mbps for these activities. However, emails with large attachments or image-heavy websites can temporarily spike usage.
Cloud Applications (CRM, Accounting, Microsoft 365, Google Workspace)
Cloud-based business applications have become the standard for most organisations. These platforms require 1–3 Mbps per user for smooth operation. When multiple employees access cloud systems simultaneously — particularly during peak hours — bandwidth demand accumulates quickly.
VoIP Calls
VoIP phone systems use relatively little bandwidth — approximately 100 Kbps per call with the G.729 codec or 256 Kbps per call with G.711. However, VoIP is extremely sensitive to latency and jitter. A business running 20 concurrent calls needs only ~2–5 Mbps of bandwidth, but that bandwidth must be stable, low-latency, and ideally prioritised using Quality of Service (QoS) configuration.
Video Conferencing (Zoom, Microsoft Teams, Google Meet)
Video conferencing is one of the largest bandwidth consumers in modern offices. Each participant in an HD video call requires 2–5 Mbps (both upload and download). A conference room with 10 participants on video can consume 20–50 Mbps on its own. This is often the application that exposes insufficient bandwidth.
File Uploads & Downloads
Large file transfers — design files, engineering documents, databases, software updates — can temporarily consume the full available bandwidth. Businesses that regularly transfer large files need higher speeds and symmetrical upload/download capabilities.
CCTV & Cloud Backups
CCTV cameras streaming to cloud storage use 2–8 Mbps per camera continuously. Cloud backup systems can consume significant upload bandwidth, especially during scheduled backup windows. These are often the most underestimated bandwidth consumers.
Bandwidth by Application Summary
| Application | Bandwidth Per User/Device | Latency Sensitivity | Priority |
|---|---|---|---|
| Email & browsing | 1–2 Mbps | Low | Low |
| Cloud applications | 1–3 Mbps | Medium | Medium |
| VoIP calls | 100–256 Kbps per call | Very High | High |
| Video conferencing (HD) | 2–5 Mbps | High | High |
| File transfers | Variable (10–50 Mbps bursts) | Low | Medium |
| CCTV streaming | 2–8 Mbps per camera | Medium | Medium |
| Cloud backups | Variable (upload heavy) | Low | Low |
Bandwidth Per User (Rule of Thumb)
While actual requirements vary by application mix, the following per-user guidelines provide a practical starting point for estimating business bandwidth requirements.
| User Type | Activities | Bandwidth Needed |
|---|---|---|
| Light user | Email, browsing, basic cloud apps | 1–2 Mbps |
| Standard user | Cloud apps, VoIP, occasional video calls | 3–5 Mbps |
| Heavy user | Video conferencing, large files, design/engineering tools | 5–10 Mbps |
| Call centre agent | Continuous VoIP, CRM, screen sharing | 2–4 Mbps (dedicated) |
How to Calculate Your Business Internet Speed
Follow this four-step process to determine the right internet speed for your office.
Step 1: Count Your Users
Count every person and device that will use the internet connection simultaneously. Include computers, phones, tablets, printers, CCTV cameras, and guest WiFi devices.
Example: 20 employees + 4 CCTV cameras + guest WiFi = ~25 connected devices
Step 2: Define Usage Patterns
Categorise your users by activity type. How many are light users? Standard? Heavy? How many concurrent VoIP calls will run? How many video meetings happen simultaneously?
Example:
- 5 light users (email, browsing) × 2 Mbps = 10 Mbps
- 10 standard users (cloud apps, VoIP) × 5 Mbps = 50 Mbps
- 5 heavy users (video, design) × 8 Mbps = 40 Mbps
- 4 CCTV cameras × 4 Mbps = 16 Mbps
Subtotal: 116 Mbps
Step 3: Add Headroom (30–50%)
Always add buffer capacity for peak usage periods, software updates, unexpected traffic, and future growth.
116 Mbps × 1.3 = ~150 Mbps
Step 4: Choose the Right Plan
Recommendation: A 150–200 Mbps business fibre connection would serve this office well. If VoIP is critical, ensure the provider supports QoS or consider dedicated bandwidth.
Recommended Speeds by Business Type
| Business Type | Users | Recommended Speed | Best Technology |
|---|---|---|---|
| Small office | 5–10 | 20–50 Mbps | Fibre or wireless |
| Medium business | 10–50 | 50–200 Mbps | Fibre preferred |
| Call centre | 20–200+ | 100 Mbps – 1 Gbps | Dedicated fibre with SLA |
| Large enterprise | 50–500+ | 500 Mbps – 10 Gbps | Dedicated fibre or microwave |
| Multi-site business | Varies | Per-site calculation | Fibre + microwave inter-site |
Why Speed Alone Is Not Enough
Many businesses focus exclusively on megabits per second when choosing internet. This is a common and costly mistake. Speed without reliability is meaningless.
Three additional factors are equally important:
Latency
Latency measures the delay between sending and receiving data. For VoIP calls and cloud PBX systems, latency above 150ms causes noticeable voice delay and poor call quality. Business-grade connections typically deliver latency under 20ms.
Stability & Jitter
Jitter is the variation in latency over time. Even if average latency is acceptable, high jitter causes choppy audio, dropped packets, and inconsistent application performance. Stable connections — particularly fibre and licensed wireless — minimise jitter.
Contention Ratio
The contention ratio indicates how many users share the same bandwidth. A 10:1 ratio means 10 customers share the same pipe. During peak hours, this can significantly reduce actual speeds. Dedicated connections (1:1 ratio) guarantee consistent performance at all times.
Learn more about choosing reliable connectivity in our most reliable internet for business guide.
Common Mistakes Businesses Make
1. Underestimating Usage
Businesses often calculate bandwidth based on current user count without accounting for growth, new applications, or increasing cloud dependency. Always plan for 12–24 months ahead.
2. Ignoring Upload Speed
Most ISPs advertise download speeds prominently, but upload speed is equally important for video conferencing, cloud backups, CCTV streaming, and file sharing. Look for symmetrical connections or confirm upload speeds meet your needs.
3. No Backup Connection
Relying on a single internet connection — regardless of speed — creates a single point of failure. Every business should have backup connectivity to maintain operations during outages.
4. Choosing the Cheapest Option
The lowest-cost connection often comes with high contention ratios, no SLA, and basic support. The cost of a single day of downtime typically exceeds an entire year's difference between cheap and reliable connectivity.
5. Not Considering Internal Network
A fast internet connection is wasted if the internal network — WiFi access points, switches, cabling — cannot handle the throughput. Ensure your LAN infrastructure matches your internet capacity.
Fibre vs Wireless vs LTE for Speed
| Feature | Fibre | Wireless | LTE / 5G |
|---|---|---|---|
| Maximum Speed | 1 Gbps+ (up to 10 Gbps dedicated) | 10–200 Mbps | 20–1000 Mbps (5G) |
| Stability | Excellent | Good | Variable |
| Latency | Very Low (<3ms) | Medium (10–30ms) | Medium (15–50ms) |
| Symmetrical Upload | Often available | Sometimes | Rarely |
| Best For | Primary connectivity | Fibre alternative | Backup / mobility |
For a detailed comparison, read our Fibre vs Wireless vs LTE comparison guide.
How to Future-Proof Your Internet
Business internet needs grow year over year as organisations adopt more cloud services, hire more employees, and increase their digital footprint. To avoid costly upgrades every 12 months:
- Plan for growth — provision 30–50% more capacity than current calculations require
- Use scalable solutions — choose providers that allow bandwidth upgrades without new installations
- Implement redundancy — combine fibre with LTE failover or wireless backup
- Monitor usage — track bandwidth utilisation to identify when upgrades are needed before performance degrades
- Invest in internal infrastructure — ensure WiFi, switches, and cabling can handle current and future speeds
When You Need to Upgrade Your Internet
If your business experiences any of these symptoms, it is time to evaluate your connectivity:
- Cloud applications loading slowly or timing out
- Poor VoIP call quality — choppy audio, dropped calls, echo
- Video calls buffering or reducing to low resolution
- File uploads and downloads taking excessively long
- Staff complaints about "slow internet" during business hours
- Bandwidth utilisation consistently above 70% during peak periods
For diagnosis and solutions, read our guide on why business internet is slow and how to fix it.
Get the Right Internet Speed for Your Business
SureTel helps businesses choose the right connectivity based on real usage analysis — not guesswork or oversimplified speed tiers.
Our approach includes:
- Usage assessment — we analyse your applications, user count, and growth plans
- Technology recommendation — fibre, wireless, LTE, or microwave based on your location and requirements
- Right-sized bandwidth — no overpaying for capacity you don't need
- Redundancy planning — backup connectivity to ensure zero downtime
- Ongoing monitoring — proactive alerts when utilisation approaches capacity limits
Speak to a SureTel specialist to design the right connectivity solution for your business →
Further Reading
- The Ultimate Guide to Business Connectivity in South Africa
- Fibre Internet for Business
- Wireless Internet for Business
- LTE & 5G Internet for Business
- Microwave Internet for Business
- Fibre vs Wireless vs LTE Comparison
- Most Reliable Internet for Business
- Backup Internet Solutions
- Why Your Business Internet Is Slow
- How to Choose the Best Internet Provider