Determining the right bandwidth requirements for your business internet begins with understanding how your organisation actually uses data. Voice over IP (VoIP) calls, video meetings, cloud applications, CRM systems, file sharing and remote access all consume bandwidth in different ways. To ensure clear, reliable calls and responsive applications, you must calculate both the average and peak demand across your users and locations. A typical VoIP call may use 100 kbps per call in each direction, but this quickly multiplies when several staff are on concurrent calls while others are joining video conferences or transferring large files. The key is not only to add up the numbers, but also to allow a safety margin so that performance does not deteriorate at busy times.
The right bandwidth is therefore a balance between technical requirements, business growth plans and budget. Start by listing the number of users, expected simultaneous VoIP calls, and critical applications such as Microsoft 365, Teams, Zoom, cloud-based phone systems, accounting platforms and any industry-specific software. Next, consider how many people work on-site, remotely or in hybrid patterns, and whether your business relies heavily on large file uploads or downloads. With this information, you can estimate both downstream and upstream requirements, then select a broadband or leased line service that offers sufficient capacity, low latency and prioritisation for voice traffic. Taking this structured approach helps you choose business phone and broadband packages that support present needs and future expansion without overspending on unnecessary capacity.
Begin by calculating the bandwidth required for VoIP. As a guide, allow around 100 kbps per concurrent call in each direction for standard quality, or 150 kbps for higher quality codecs. Multiply this by the maximum number of simultaneous calls you expect, including external calls, internal calls between extensions, and any call centre or helpdesk activity.
Next, assess your other applications. Cloud productivity suites, video conferencing, VPN access and regular file transfers can each demand several megabits per user at peak times. Identify which activities are business-critical and when they typically occur. This helps you understand your true peak usage, rather than relying on average figures that may underestimate your needs.
Finally, add a safety margin of at least 25–50% above your calculated peak requirement to allow for growth, bursts of activity and background traffic such as software updates and backups. Where possible, choose connections and routers that support Quality of Service (QoS) so VoIP traffic is prioritised, ensuring call quality remains stable even when the connection is busy.
