What are the biggest unknowns in the TTK calculation?

Headshot ratios (no real gameplay tracking data), accuracy hit rates (derived from ADS spread formulas), reload cancel timing (based on Halo/Destiny 2 research), and several weapon-specific mechanics.

How We Calculate TTK

Q: How does Durandal.gg calculate TTK for Marathon weapons?

Durandal.gg uses a 12-step formula that models accuracy, headshot ratios, weapon mechanics (burst fire, shotgun pellets, overheat, charge-fire), reload cycles, and additive times. The formula runs per weapon, per skill level, per range, and per shield tier.

Durandal.gg ranks Marathon weapons by time-to-kill using a 12-step formula. This page explains every step, lists our assumptions, and flags what we know vs. what we're estimating.

19 of 28 weapons have verified base stats from the in-game armory. Weapons without verified data are marked with a yellow warning icon in the UI.

The 12-Step Formula

Steps execute in this fixed order for every weapon, skill level, range, and shield tier.

Step	Name	What it does
1	Accuracy lookup	Get ADS hit rate for this weapon type, range, and skill level
2	RPM accuracy penalty	Faster-firing weapons get a per-slug accuracy penalty
3	Volt projectile penalty	Volt and Volt Cell weapons get reduced hit rate (7 weapons)
4	Charged damage	If weapon has a charge multiplier, multiply base damage (2 weapons)
5	Effective damage	Blend body and headshot damage using headshot ratio and precision multiplier
6	Shotgun pellet model	Multiple pellets per trigger pull, each with its own hit/crit roll (2 weapons)
7	Hits to kill	Divide EHP by effective damage, round up, then divide by hit rate for shots fired
8	Burst fire timing	Add inter-burst delay for burst-fire weapons (2 weapons)
9	Overheat split	Split fire time at threshold RPM (1 weapons)
10	Reload cycles	Count reload cycles needed, apply reload cancel timing
11	Additive times	Add charge time, spin-up time
12	Final TTK	Sum of fire time + reload time + additive times (minimum 0.05s)

Weapon Mechanics

Some weapons use special mechanics that branch the formula at specific steps.

Shotgun pellet model (step 6)

Each trigger pull fires multiple pellets. Hit rate determines how many connect, headshot ratio determines how many hit the head. Applies to: WSTR Combat Shotgun (8 pellets). Misriah 2442 (7 pellets).

Burst fire (step 8)

RPM is the intra-burst fire rate. Between bursts, there's a fixed delay. BRRT SMG (5-round, 0.15s delay). BR33 Volley Rifle (3-round, 0.2s delay).

Overheat (step 9)

Weapon fires at listed RPM until an overheat threshold, then drops to a sustained rate. V75 Scar (600 RPM → 120 after 8 shots).

Charge-fire (step 4)

Multiplies base damage before all other damage calculations. V11 Punch (2x). V66 Lookout (1.5x). Charge time is added at step 11.

Volt projectile penalty (step 3)

Volt and Volt Cell weapons fire projectiles with travel time, reducing effective hit rate. Applies to: V11 Punch, V75 Scar, V22 Volt Thrower, V66 Lookout, V85 Circuit Breaker, V99 Channel Rifle, V00 Zeus RG.

Known Unknowns

These are the biggest assumptions in our model. They affect TTK calculations and are the main source of potential error.

Assumption	Current value	Confidence	Why it matters
Headshot ratios	Type-based defaults (6-30%)	Guess	High precision weapons shift dramatically with headshot rate
Accuracy hit rates	Derived from ADS spread formulas	Estimated	Determines shots fired per kill, affects every weapon
Reload cancel timing	Type-based multipliers (Halo/D2 blend)	Estimated	Marathon's actual reload cancel behavior is unknown
Volt projectile penalty	0.85 default, 0.75 long	Estimated	Affects V11 Punch, V75 Scar, V22 Volt Thrower, V66 Lookout, V85 Circuit Breaker, V99 Channel Rifle, V00 Zeus RG
V11 Punch charge multiplier	2x	estimated	Not confirmed in-game
V75 Scar initial rpm	600	estimated	Not confirmed in-game
V75 Scar overheat threshold	8 shots	estimated	Not confirmed in-game
BRRT SMG burst delay	0.15s	estimated	Not confirmed in-game
BR33 Volley Rifle burst delay	0.2s	estimated	Not confirmed in-game
V66 Lookout charge multiplier	1.5x	estimated	Not confirmed in-game
Misriah 2442 pellet count	7	estimated	Not confirmed in-game

Data Sources

Source	Confidence	Coverage
In-game armory	Verified	19 of 28 weapons
Community datamine	Community	6 of 28 weapons
Type-based defaults	Placeholder	2 of 28 weapons
Datamined manifest	Scraped	1 of 28 weapons
ADS spread formula derivation	Estimated	All accuracy hit rates

Frequently Asked Questions

How does Durandal.gg calculate TTK for Marathon weapons?

We use a 12-step formula that models accuracy, headshot ratios, weapon mechanics (burst fire, shotgun pellets, overheat, charge-fire), reload cycles, and additive times like charge-up and spin-up. The formula runs per weapon, per skill level, per range, and per shield tier.

How accurate is the TTK data?

Base weapon stats (damage, RPM, magazine) are verified from the in-game armory for 19 of 28 weapons. Accuracy hit rates, headshot ratios, and some mechanic values are estimated. All estimated values are flagged in the UI with a warning icon.

What are the biggest unknowns?

Headshot ratios (no gameplay tracking data), accuracy hit rates (derived from ADS spread formulas), and reload cancel timing (based on Halo/Destiny 2 research). Additionally, 7 weapon-specific mechanic values are estimated.

Launch March 2026. Input: MnK (Steam). mechanicsVersion: 2.0.