Skill Rotation Calculator

A skill rotation calculator helps gamers determine the optimal order and timing of abilities in action RPGs, MMORPGs, and any game with cooldown-based combat. By modelling each skill's damage, cooldown, cast time, and mana cost, the calculator simulates an entire fight window and surfaces which sequence produces the highest sustained DPS (damage per second).

Whether you are theorycrafting a new build, comparing two talent trees, or just learning a class, this tool removes guesswork and replaces it with concrete numbers. Enter your abilities, set your rotation window and mana pool, and the calculator instantly ranks skills by priority, projects total damage, and checks whether your mana is sustainable over the full encounter.

Skill rotations matter at every level of play. A player who understands that a high-damage ability with an 8-second cooldown outperforms a moderate ability spammed every second can double effective output without changing gear. This calculator makes those insights visible and actionable for any game that uses a cooldown and resource system.

The calculator applies the following formulas to every skill you enter. Understanding them lets you interpret the results correctly and make intentional adjustments.

Damage Per Second (DPS)

For skills that have a cooldown, DPS is measured across the full cooldown window. For instant-cast or auto-attack skills with no cooldown, DPS is measured across the cast time instead:

If cooldown > 0: DPS = Damage ÷ Cooldown

If cooldown = 0: DPS = Damage ÷ Cast Time

This correctly penalises slow cooldowns and rewards tight ones. A skill that hits for 8,000 damage on a 15-second cooldown gives 533 DPS, while a skill hitting for 5,000 on an 8-second cooldown gives 625 DPS — the smaller hit is actually stronger in sustained combat.

Uses Per Rotation

The number of times a skill fires in the rotation window depends on whether it has a cooldown:

If cooldown > 0: Uses = floor(Duration ÷ Cooldown) + 1

If cooldown = 0: Uses = floor(Duration ÷ Cast Time)

The "+1" for cooldown skills accounts for the opening cast at time zero before the first cooldown cycle begins.

Mana Efficiency

Efficiency = Damage ÷ Mana Cost

A skill with no mana cost is labelled "Free." Higher efficiency means more damage returned per mana spent, which is critical when your rotation exceeds your mana budget.

Mana Budget

Mana Needed = Total Mana Used − (Mana Regen × Duration) (floored at 0)

If this value is zero the rotation is self-sustaining. If it is positive you need a larger mana pool or better efficiency.

Overall DPS

Overall DPS = Total Damage ÷ Rotation Duration

This is the headline figure — the average output over the full encounter window.

The calculator simulates a greedy rotation algorithm — the same approach used in many game theory discussions and community-developed WeakAuras or rotation helpers. At every point in time it scans all available skills and picks the one with the highest DPS that you can currently afford with your mana pool.

Time advances in 0.5-second increments when no skill is castable (either all cooldowns are active or mana is exhausted). During each 0.5-second wait your mana regenerates by Mana Regen × 0.5, capped at your maximum mana. This models the real tension in mana-heavy games: waiting for mana recovery costs you cast time, so high mana regen allows a more aggressive and damage-dense rotation.

Each cast is logged with a timestamp, skill name, and damage value. The first 20 entries of the optimal sequence are displayed in the Sample Rotation panel, giving you a readable cast-by-cast breakdown you can follow during gameplay.

Skills with a cooldown of zero are treated as filler or basic attacks and are available every cast. The greedy algorithm naturally inserts them into gaps left by cooldown abilities, preventing wasted time and keeping damage flowing. This mirrors best-practice rotation theory: always be casting, and fill gaps with the highest-value available option.

The Skill Priority panel ranks all cooldown-based abilities by their sustained DPS value. This ranking tells you the order in which to press buttons when multiple skills come off cooldown simultaneously. Highest DPS always goes first — delaying your strongest skill even by one global cooldown is a measurable loss over a long fight.

Priority-based rotation theory is foundational to most modern MMORPG theorycrafting communities. Unlike a strict sequence (cast A, then B, then C, always), a priority system adapts to real combat: if your top-priority skill is still on cooldown, you move to the next available skill. This is more robust than a fixed sequence because it degrades gracefully when cooldowns desync due to lag, movement, or interrupt mechanics.

The table also shows Uses Per Rotation, Total Damage, and Mana Efficiency for each skill. Use Uses Per Rotation to sense-check whether an ability is worth taking at all — if it fires only once in a 60-second window because of a very long cooldown, its contribution may be smaller than a fast spammable skill even if the raw hit is large.

Mana Efficiency (Damage ÷ Mana Cost) is especially useful when you identify a mana deficit. Sort mentally by efficiency and consider dropping the least efficient skills or reducing the rotation window until your mana status turns sustainable (green).

Sustained DPS means nothing if your character runs dry at the 20-second mark. The mana status indicator shows whether your rotation is Sustainable (your regen covers all costs over the full window) or in Deficit (you would need more base mana or regeneration).

The deficit figure is: Total Mana Used − (Mana Regen × Duration). If it is positive, that is the extra mana pool you need, assuming you start full and regen ticks constantly. To correct a deficit you have several options: increase Mana Regen input if you plan to gear for it, reduce the Rotation Duration to a shorter window, remove the least mana-efficient skill, or increase your Max Mana if your build allows it.

Many games gate top-end performance behind mana sustainability. A rotation that produces 10,000 DPS for 30 seconds then stalls is weaker than an 8,000 DPS rotation that runs indefinitely. Use this calculator to find the highest DPS rotation that also shows a green Sustainable status — that is your real ceiling.

Mana regen interacts with fight length: longer fights benefit disproportionately from high regen because the total mana generated scales linearly with time. Short burst windows (under 20 seconds) are dominated by your starting mana pool, so max mana matters more there. Adjust the Rotation Duration slider to match your target fight phase and observe how the mana status changes.

Getting accurate results takes only a minute once you understand which stats to enter. Follow these steps for any game with cooldown-based combat.

1. Set your rotation window. Enter the fight duration or the phase length you are optimising for in the Rotation Duration field. 60 seconds is a common benchmark for sustained encounters.
2. Enter your mana pool. Input your Max Mana and Mana Regen per second. Find these on your character sheet or in the game's stat panel.
3. Add your skills. For each ability, enter its name, flat damage value, cooldown in seconds, cast time, and mana cost. Leave cooldown at 0 for basic attacks or instant-cast filler abilities.
4. Read the DPS output. The Estimated DPS card shows your headline number. The Skill Priority table ranks each ability and shows how many times it fires.
5. Check mana sustainability. If the Mana Status shows Deficit, remove the weakest skill or increase your Mana Regen until it turns Sustainable.
6. Follow the Sample Rotation. The timestamped cast list gives you a real sequence to practice in-game, with each skill's timestamp and damage contribution.

Iterate by adjusting cooldowns or damage values to model talent choices, item procs, or buff windows. Because all calculations are live, you can compare two builds side by side by changing one input at a time and noting the DPS difference.