About Tactical Reroll

A free, fan-made mathhammer toolkit for Warhammer 40,000: a 40k damage calculator for any attack, a list builder, a tier list for every army with SWORD and SHIELD scores for every unit, and a Meta page with the winning lists and the latest balance update.

How we grade units

• The letter is on every unit: S the army's best, then A strong, B solid, C situational and D weakest. It's the average of what reviewers gave the unit, and it ranks within an army: an S Tyranid unit isn't always better than a B Space Marine unit.
• A dashed letter is our estimate, from SWORD, SHIELD and roles, for a unit no reviewer has rated yet. Crucible and Titanicus units are not rated. How it works ›
• SWORD and SHIELD are our own dice maths: how much a unit kills and what it takes to kill it, per point, against what top tournament lists field. You see them as scores from 0 to 100 against units of the same kind: a SWORD of 90 is in the top 10% of them.
• Weapons: the main number uses the weapons lists take where we know them, with the best weapons beside it.
• The Best pages rank units by a simpler dice number for one role at a time: each unit at its minimum size and points, with its best legal squad into each target, on one neutral table: targets in cover, Heavy weapons fired standing still, nobody within half range.
• Not in a unit's own numbers: leaders and stratagems. So a letter is a starting point, not a verdict. In the calculator you can switch many such effects on.

Our numbers come from a closed-form engine that our tests check against the calculator's own dice simulation on real datasheets. In the calculator, To the death decides who strikes first in each fight phase, Fights First included: the charger first on the charge, then the unit with Fights First if only one of the two has it, else the player whose turn it is.

Every step, and a diagram of how the letter and the scores are made: How we score ›

Words we use

Our own terms, the same on every page and in the calculator.

Share slain

How much of the target unit an attack removes on average, as a share of its models: 60% slain means six of ten models, over many rolls of the same attack.

Wounds removed per 100 points

Our measure of hitting power: the wounds an attack takes off a target on average (not counting damage wasted on a model already dead), for every 100 points the attacker costs. It lets a cheap squad and an expensive one compare fairly.

Points removed

The points value of what an attack kills: models slain times what each costs in the target's unit.

Benchmark targets

Five kinds of target every unit is tested against (GEQ, MEQ, TEQ, Light vehicle, Heavy vehicle), and five kinds of weapon for durability; How we score gives each one's profile. They stand for the common kinds of unit in the game, not for any particular datasheet.

Best loadout

For each target, the legal squad (wargear the datasheet allows, at the unit's size) that removes the most from it. Different targets can have different best squads.

All-round loadout

The one legal squad that does best when you don't know the target: the one whose weakest result, against each target's best squad, is strongest.

Letter

S to D: where a unit ranks within its army, the average of what reviewers gave it. Crucible and Titanicus units are not rated.

Dashed letter

Our estimate, from SWORD, SHIELD and roles, for a unit no reviewer has rated yet.

SWORD

Our dice maths for how much a unit kills: the enemy points it removes in a turn for every 100 points it costs, shown as a score from 0 to 100 against units of the same kind. A SWORD of 90 is in the top 10% of them.

SHIELD

Our dice maths for how hard a unit is to kill: the enemy points it takes to remove 100 points of it, shown as a score from 0 to 100 against units of the same kind.

Role

What a unit is for beyond its dice, such as holding objectives or screening. A unit's page shows its roles as chips: tap one for the plain words. Where no reviewer rated a unit, roles go into our estimate.

9 in 10, average, 1 in 10

The calculator's funnel shows three results for each step: what 9 rolls in 10 reach at least, the average, and what only the luckiest 1 roll in 10 reaches.

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. SWORD and SHIELD are measured against what they field. 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 (a private form) and we'll respond promptly.

Our own work. The writing and guides, tier letters, scores and charts, the pixel figures and art, and the site's code are © 2026 Tactical Reroll. All rights reserved. You're welcome to quote short parts and to share our numbers with a link back to tacticalreroll.com, and teachers may use our material in non-commercial lessons with a credit to "Tactical Reroll (tacticalreroll.com)". Copying our pages, data, art or code in bulk, building them into another site or app, or any commercial use needs our written permission first: ask us here. This covers only our own work: anything from Games Workshop or our other sources stays theirs, and we can't give permission for it.