ISP Oversubscription Calculator

Model contention across mixed package tiers and check whether your aggregate demand fits within a target oversubscription ratio.

2 Gbps uplink capacity · needs ≥ 1,900 Mbps for highest package + 90% overhead

Common: 1:1 dedicated · 10–20:1 business · 30–50:1 residential

Packages

NameTypeCountSpeed (Mbps)Avg use (Mbps)Sold (Mbps)
500
2,000
3,600
Total users
19
Total sold capacity
6,100 Mbps
Average plan speed
321.05 Mbps
Actual sold-to-pipe ratio
3.05 : 1
Target 20:1
Max active users at target ratio
125
(pipe × ratio) ÷ avg plan
Available bandwidth per user at target
100 Mbps
Highest package speed
1,000 Mbps
Required pipe (+90% overhead)
1,900 Mbps
Must cover highest package × 1.9

Peak-time pipe usage

As of July 2026, average concurrent usage per user is 6 Mbps for residential and 10 Mbps for business — these are defaults per package type and can be overridden in the "Avg use (Mbps)" column above. Residential peak 5pm–10pm · Business peak 9am–6pm · Overlap 5pm–6pm (both active).

Residential peak (5pm–10pm)
102 Mbps
17 residential users
Business peak (9am–6pm)
20 Mbps
2 business users
Overlap peak (5pm–6pm)
122 Mbps
Residential + business concurrent
Peak pipe usage
122 Mbps
6.1% of 2,000 Mbps pipe
Within threshold: sold ratio 3.05:1 ≤ target 20:1, pipe covers highest package + 90% overhead, and peak usage (122 Mbps) fits within the pipe.

Formulas used

  • Available bandwidth = Pipe speed ÷ Oversubscription ratio
  • Max active users = (Pipe speed × Target ratio) ÷ Average plan speed
  • Sold-to-pipe ratio = Total sold capacity ÷ Pipe speed
  • Required pipe with 90% overhead = Highest package speed × 1.9
  • Residential peak (5pm–10pm) = Σ (residential package count × its avg use Mbps)
  • Business peak (9am–6pm) = Σ (business package count × its avg use Mbps)
  • Overlap peak (5pm–6pm) = Residential peak + Business peak (both windows active)