Internet Breakout Calculator
Compare local internet breakout with hub backhaul to see the bandwidth saved at the data centre edge.
About Internet Breakout Calculator
Every megabit broken out at the branch is a megabit that never traverses the WAN twice — once inbound to the hub and once outbound to the internet. The remaining share still consumes hub capacity and the hub's security stack. Breakout decisions drive both circuit spend and firewall sizing at the hub; a 70% breakout policy on 40 sites removes over a gigabit of load from the central edge.
Formula
Internet Breakout
hub load = sites × users × per-user demand × (1 − local breakout share); bandwidth avoided is the complement.
- local breakout share
- Fraction of internet traffic sent straight out of the branch
- per-user demand
- Busy-hour internet and SaaS throughput per user
Worked example
With the default values below, Internet Breakout Calculator returns Backhauled to the Hub of 600.00. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Branch sitesaccepts 1–10,000 sites
- 40 sites
- Users per siteaccepts 1–10,000 users
- 25 users
- Internet demand per useraccepts 0.05–100 Mbps
- 2 Mbps
- Traffic broken out locallyaccepts 0–100 %
- 70 %
- Hub internet capacityaccepts 1–400,000 Mbps
- 10,000 Mbps
Results
- Backhauled to the Hub
- 600.00 Mbps
- Local Breakout per Site
- 35.00 Mbps
- Backhaul per Site
- 15.00 Mbps
- Hub Bandwidth Avoided
- 1,400.00 Mbps
- Hub Link Utilisation
- 6.00%
Step by step
- 1Values used
- 2Internet Breakout
- 3Backhauled to the Hub= 600.00 Mbps
- 4Local Breakout per Site= 35.00 Mbps
- 5Backhaul per Site= 15.00 Mbps
- 6Hub Bandwidth Avoided= 1,400.00 Mbps
- 7Hub Link Utilisation= 6.00
Assumptions and limits
- The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Internet Breakout calculated?
hub load = sites × users × per-user demand × (1 − local breakout share); bandwidth avoided is the complement. Every megabit broken out at the branch is a megabit that never traverses the WAN twice — once inbound to the hub and once outbound to the internet. The remaining share still consumes hub capacity and the hub's security stack.
Why does Internet Breakout matter?
Breakout decisions drive both circuit spend and firewall sizing at the hub; a 70% breakout policy on 40 sites removes over a gigabit of load from the central edge.
What values do I need to enter?
This calculator takes 5 inputs: Branch sites, Users per site, Internet demand per user, Traffic broken out locally, Hub internet capacity. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.