Optimize your Honkai: Star Rail team’s combat efficiency by precisely calculating the minimum Speed (SPD) required to achieve a specific number of actions within the critical first few cycles of the Forgotten Hall or Pure Fiction. Use this tool to hit vital speed breakpoints!
Honkai Star Rail Speed Tuning Calculator
Honkai Star Rail Speed Tuning Calculator Formula
This calculator is based on the relationship between Speed (SPD), Action Value (AV), and Combat Cycles in the game.
Action Value (AV) per turn = 10000 / SPD
Total AV in C Cycles = 150 × C
To achieve N actions (turns) in C cycles:
Minimum Required SPD ≈ (10000 × N) / (150 × C)
Formula Source: HSR Wiki: Speed Mechanics, Prydwen Speed Tuning Guide
Variables Explained
- Desired Actions (N): The specific number of turns you want your character to take (e.g., 4 turns in 2 cycles).
- Target Cycles (C): The number of combat cycles (each is 150 AV) you want to complete the actions within. Common values are 1, 2, or 3.
- Current/Target Speed (SPD): The total speed stat of your character (Base SPD + Light Cone + Relics).
Related Calculators
- EHR and EFR Breakpoint Checker
- Crit Ratio Optimizer
- DoT Damage Stacking Calculator
- Energy Regeneration Rate Solver
What is Honkai Star Rail Speed Tuning?
Speed Tuning is the process of adjusting a team’s Speed (SPD) stats to control the turn order and maximize damage output or utility application within the strict turn limits of endgame content like Forgotten Hall. Since each cycle has a fixed Action Value (AV) limit (150 AV), reaching certain SPD thresholds ensures your characters get more turns than the enemy, or, critically, that your support characters act immediately before your primary damage dealer.
For example, if your DPS needs 4 actions to set up a powerful Ultimate, this calculator helps you find the minimum SPD required to guarantee those 4 actions happen before Cycle 3, preventing a critical delay in your damage rotation.
How to Calculate Speed Tuning (Example)
Let’s find the minimum SPD required for a Support character to take 3 Actions (N) within the first 1.5 Cycles (C) of combat.
- Determine Total Available AV: Total AV = 150 (AV per Cycle) × 1.5 (Target Cycles) = 225 AV.
- Set up the Equation: Required SPD ≈ (10000 × N) / Total AV.
- Substitute Values: Required SPD ≈ (10000 × 3) / 225.
- Calculate Result: Required SPD ≈ 30000 / 225 ≈ 133.34.
- Conclusion: The support character needs a minimum SPD of 133.34 to guarantee 3 actions within the first 1.5 cycles. In practice, you would aim for 134 SPD to be safe.
Frequently Asked Questions (FAQ)
What is the most important speed breakpoint?
The 134 SPD breakpoint is arguably the most important. It guarantees two turns in the first cycle (150 AV), which is critical for maximizing buffs and damage output immediately.
How does Speed affect Action Value (AV)?
Speed determines your character’s AV, which is the amount of ‘time’ needed before their next turn. Higher SPD means lower AV (10000 / SPD), so turns come quicker.
What happens if my speed is exactly 133.3?
Due to rounding in the game’s internal calculation, aiming for a few decimal points above the breakpoint (e.g., 133.4 for a 133.34 requirement) or simply aiming for the next integer (134) is highly recommended for consistency.
Can I use this calculator for DPS/Support pairing?
Yes. Calculate the DPS’s required speed for their desired turns, and then ensure the Support’s speed is slightly higher (e.g., 1 SPD higher) to act before the DPS acts in the first cycle.