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Round Robin Distribution Calculator

Show exactly how round-robin splits requests across a pool, including the remainder servers and the resulting per-server load.

About Round Robin Distribution Calculator

Round robin walks the pool in order, so each server receives the integer quotient of the request count and the first few servers absorb the remainder. Because the split ignores server capability, the per-server rate is simply the total divided by the pool size. Round robin only balances load when every server is identical and every request costs the same — the failover column is the one that decides whether the pool survives a node loss.

Formula

Round Robin Distribution

requests per server = floor(requests ÷ servers); the first (requests mod servers) servers take one extra request; per-server rate = request rate ÷ servers.

serversWithExtra
requests mod servers — the remainder of the division
failoverUtilisation
Load per server once the pool is one member short

Worked example

With the default values below, Round Robin Distribution Calculator returns Requests per Server of 14,285. Change any input above and every figure here is recalculated in your browser.

Inputs used

Requests in the measurement windowaccepts 1–1,000,000,000 requests
100,000 requests
Servers in the poolaccepts 1–1,024 servers
7 servers
Request rate at peakaccepts 1–10,000,000 rps
14,000 rps
Capacity per serveraccepts 1–1,000,000 rps
2,500 rps

Results

Requests per Server
14,285
Servers Taking One Extra Request
5
Peak Load per Server
2,000.0 rps
Server Utilisation at Peak
80.0%
Distribution Imbalance
0.007%
Utilisation After Losing One Server
93.3%

Step by step

  1. 1Values used
  2. 2Round Robin Distribution
  3. 3Requests per Server= 14,285
  4. 4Servers Taking One Extra Request= 5
  5. 5Peak Load per Server= 2,000.0 rps
  6. 6Server Utilisation at Peak= 80.0
  7. 7Distribution Imbalance= 0.007
  8. 8Utilisation After Losing One Server= 93.3

Assumptions and limits

  • The result is derived only from the 4 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 3 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 Round Robin Distribution calculated?

requests per server = floor(requests ÷ servers); the first (requests mod servers) servers take one extra request; per-server rate = request rate ÷ servers. Round robin walks the pool in order, so each server receives the integer quotient of the request count and the first few servers absorb the remainder. Because the split ignores server capability, the per-server rate is simply the total divided by the pool size.

Why does Round Robin Distribution matter?

Round robin only balances load when every server is identical and every request costs the same — the failover column is the one that decides whether the pool survives a node loss.

What values do I need to enter?

This calculator takes 4 inputs: Requests in the measurement window, Servers in the pool, Request rate at peak, Capacity per server. 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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