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Network Growth Forecast Calculator

Compound current traffic by a growth rate to forecast future load and the year the link runs out of capacity.

About Network Growth Forecast Calculator

Traffic growth is multiplicative, so a 35% annual rate quadruples load in under five years. Taking logarithms of both sides of the compound-growth formula gives the exact time at which the forecast crosses your upgrade trigger and, separately, the line rate itself. The upgrade trigger date is the one that matters operationally, because procurement, cabling and change windows all have to fit between it and the day the link saturates.

Formula

Network Growth Forecast

traffic = current × (1 + growth)^years; years to a target = ln(target ÷ current) ÷ ln(1 + growth).

growth
Compound annual growth rate of peak traffic
target
Upgrade threshold or full link capacity

Worked example

With the default values below, Network Growth Forecast Calculator returns Traffic at End of Forecast of 17.94. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current peak trafficaccepts 0.001–100,000 Gbps
4 Gbps
Annual growth rateaccepts 0–300 %
35 %
Years to forecastaccepts 1–30 years
5 years
Installed link capacityaccepts 0.001–100,000 Gbps
10 Gbps
Upgrade trigger thresholdaccepts 10–100 %
70 %

Results

Traffic at End of Forecast
17.94 Gbps
Utilisation at End of Forecast
179.4%
Years Until the Upgrade Trigger
1.9
Years Until the Link Is Full
3.1
Growth Multiple Over the Period
4.48 ×

Step by step

  1. 1Values used
  2. 2Network Growth Forecast
  3. 3Traffic at End of Forecast= 17.94 Gbps
  4. 4Utilisation at End of Forecast= 179.4
  5. 5Years Until the Upgrade Trigger= 1.9
  6. 6Years Until the Link Is Full= 3.1
  7. 7Growth Multiple Over the Period= 4.48 ×

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 or fees or charges 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 Network Growth Forecast calculated?

traffic = current × (1 + growth)^years; years to a target = ln(target ÷ current) ÷ ln(1 + growth). Traffic growth is multiplicative, so a 35% annual rate quadruples load in under five years. Taking logarithms of both sides of the compound-growth formula gives the exact time at which the forecast crosses your upgrade trigger and, separately, the line rate itself.

Why does Network Growth Forecast matter?

The upgrade trigger date is the one that matters operationally, because procurement, cabling and change windows all have to fit between it and the day the link saturates.

What values do I need to enter?

This calculator takes 5 inputs: Current peak traffic, Annual growth rate, Years to forecast, Installed link capacity, Upgrade trigger threshold. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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