INPUTS

Spawn capacity and role profiles

Available SpawnsOPERATE_SPAWN level

Profile 1

RoleBody partsActive CreepsTravel ticksSafety bufferLifetime

Profile 2

RoleBody partsActive CreepsTravel ticksSafety bufferLifetime

Profile 3

RoleBody partsActive CreepsTravel ticksSafety bufferLifetime

Profile 4

RoleBody partsActive CreepsTravel ticksSafety bufferLifetime

RESULT

Replacement capacity plan

Average replacement demand fits the selected Spawn capacity.

Average Spawn utilization: 11.8%
Minimum Spawns by average load: 1
Spawn ticks demanded per 1500 ticks: 177
Spawn capacity per 1500 ticks: 1,500
Average free Spawn ticks: 1,323

Role replacement details

Harvester × 2Spawn time: 36 · Start replacement at TTL: 61 · Average replacement interval: 750 · Capacity share: 4.8%
Hauler × 2Spawn time: 30 · Start replacement at TTL: 60 · Average replacement interval: 750 · Capacity share: 4%
Upgrader × 1Spawn time: 45 · Start replacement at TTL: 65 · Average replacement interval: 1,500 · Capacity share: 3%
Reserver × 0Spawn time: 12 · Start replacement at TTL: 112 · Average replacement interval: — · Capacity share: 0%

This is an average-load planner, not an exact scheduler. It does not model simultaneous replacement deadlines, Spawn Energy refill time, spawn direction blocking, DISRUPT_SPAWN, extension availability, failed spawnCreep calls, or live queue priority.

Read-only queue probe

const roleProfiles = [
  {
    "role": "Harvester",
    "plannedCount": 2,
    "replacementLead": 61
  },
  {
    "role": "Hauler",
    "plannedCount": 2,
    "replacementLead": 60
  },
  {
    "role": "Upgrader",
    "plannedCount": 1,
    "replacementLead": 65
  }
];
for (const profile of roleProfiles) {
  const creeps = Object.values(Game.creeps).filter(creep => creep.memory.role === profile.role);
  const ttl = creeps.map(creep => creep.ticksToLive ?? 0).sort((a, b) => a - b);
  console.log({ role: profile.role, plannedCount: profile.plannedCount, liveCount: creeps.length, lowestTTL: ttl[0] ?? null, replacementLead: profile.replacementLead });
}

BOUNDARIES

Average capacity is not an exact queue

The planner uses three base spawn ticks per body part, a 1,500-tick normal lifetime, and a 600-tick CLAIM lifetime. OPERATE_SPAWN is applied as a planning reduction and rounded up so the result does not underestimate the queue.

Real production can still fail because replacement deadlines cluster, room Energy is not ready, a Spawn is disrupted, spawn directions are blocked, or queue priorities change.

Debug spawnCreep return codes →Build an emergency recovery queue →Official Creep documentation ↗Official Power documentation ↗