About Tactical Reroll

A free, fan-made mathhammer toolkit for Warhammer 40,000: a dice calculator, an army-vs-army comparator for imported lists, and points-efficiency rankings for every unit.

How the scores work

• Basis. Each unit is scored at its minimum size and that size's points, with its default wargear.
• Offense is the expected number of wounds removed per 100 points against five targets: Chaff (10 × T3 Sv5+ W1 infantry); MEQ (5 × T4 Sv3+ W2 infantry); TEQ (5 × T5 Sv2+ 4++ W3 infantry); Light vehicle (T10 Sv3+ W12 vehicle); Heavy vehicle (T12 Sv2+ W16 vehicle). Every gun fires; in melee each model uses its best weapon for that target plus any Extra Attacks weapons. No cover, Heavy weapons stationary, not within half range. Excess damage on a model is lost, as in the game.
• Defense is the number of hits needed to destroy the whole unit, per 100 points, from five attackers: Small arms (S4 AP0 D1 (bolter, lasgun)); Special (S5 AP-1 D1 (heavy bolter-class)); Plasma (S8 AP-2 D2 (plasma, power fist)); Elite (S6 AP-2 D3 (elite melee, precision)); Anti-tank (S12 AP-3 D6 (lascannon, melta)). It uses toughness, save, invulnerable save, wounds and the unit's own Feel No Pain (one it always has; not one a leader or enhancement gives).
• Utility is what damage and durability miss: board control (Objective Control per 100 pts); action economy (Units per 100 pts: cheap bodies for actions); reach (Move, plus Fly, Deep Strike, Infiltrators, Scouts); support (Leader, auras, Transport, Lone Operative, Stealth, revives). It comes from the datasheet's numbers, keywords and ability names only, so it can't weigh what a Leader's or aura's rule actually does. Treat it as a rough guide.
• Scores are percentiles against every current (non-Legends) unit: 100 means best per point. Offense, Defense and Utility each average their parts' percentiles; Value is the mean of Offense and Defense. In the app's rankings you can blend in Utility with your own weights.
• Not included: what abilities, auras, detachment rules and stratagems actually do, Feel No Pain from leaders or enhancements, and rules that bring models back. Those change real games a lot, so treat the scores as a starting point. In the comparator you can switch such effects on as buffs.

The expected values use the same engine as the comparator, checked against a 200,000-roll dice simulation.

Data & intellectual property

This site doesn't host datasheets. When you pick a faction, the calculator loads its data in your browser straight from the community-maintained BSData project on GitHub, the same data list builders use. The site itself publishes only unit names and points (to identify units) and its own analysis: the scores, rankings and matchup numbers. Recent winning lists come from grimstat-corpus (CC BY 4.0): lists their players and organisers published on MiniHeadQuarters, with player names removed and a link to each event. We don't publish Games Workshop's datasheets or rules text: see the official codexes and the Warhammer 40,000 app for those.

Tactical Reroll is an unofficial fan project, not affiliated with, endorsed, sponsored or approved by Games Workshop. Warhammer 40,000 and all associated names are trademarks of Games Workshop Limited, used only to identify the units analysed. Rights holders with a concern can contact us here and we'll respond promptly.