Terraria TD Calculator

Build

Unit Upgrade tier Level Reforge

Weapon & armor

Weapon Helmet Chest Boots

Accessories

Fight

Enemy Enemy DEF Enemy max HP (for % dmg) Targets in AoE Pellets landing Lock-on targeting Bad Luck

Results

Loadout Optimizer

Finds the best gear for the unit in the Build panel (same unit, tier, level and reforge). DPS is scored against the act picked in Act analysis, or the Fight enemy if no act is picked. Range doesn't change DPS in the model, so use Min RNG or a range goal to protect coverage.

Goal Min RNG Search

Don't use these items (unobtainable, or ones you don't own)

Team

5 tower slots. "Set from Build" copies the Build panel into a slot; "Edit" loads a slot back into the Build panel. Each slot has its own upgrade tier and number of placements. DPS is against the act picked below, or the Fight enemy if no act is picked.

Mana Planner

Plans the cheapest-first path to your Team: what to place and upgrade, in what order, for the most DPS per mana. Your Team slots set the targets (upgrade level and placements). DPS is against the act picked in Act analysis, or the Fight enemy.

Starting mana Passive mana / sec Seconds per wave (avg) +2 mana per kill +3 mana per flying kill +50 mana per wave cleared

Buy order

By wave (assumes the act's enemies are spread evenly across waves)

Act Analysis

Act Difficulty Rank accessories for Accessory slot to swap

Enemy counts are from one recorded run per act on the Trello board, so treat them as typical, not exact. Team Act DPS = every tower in your Team (× its placements) against each enemy (its own DEF and type tags), averaged by how many of that enemy spawn. Enemy HP isn't used because it scales by wave; % max-HP units use the HP you type in the Fight panel.

Enemy mix

Best accessory vs this act

Team in this act

Each tower from the Team section at its upgrade level and placement count.

DPS vs. Enemy Defense

Each tower's line is its DPS × placements. Uses the Fight settings (targets, whip, HP, situational buffs). Red dashed line = Fight enemy's DEF; gold dashed line = the picked act's average DEF.

Towers Ranked

How rankings work

Every tower at max upgrade and Level 45. Base (default) ranks each tower exactly as it comes for the general categories: no weapon, armor, accessories or reforge. Best gear gives each tower its own best gear per column (Legendary-first, kept at 11+ RNG). Overall = percentile per stat (best = 100), weighted DPS 25% · Range 20% · Crowd 20% · Cost Efficiency 15% · Bossing 15% · Placement Count 5% (Crowd = the better of AoE damage and crowd control; Bossing = seconds for one max-level, max-upgrade tower with its best gear to kill a 2,800 HP Eye of Cthulhu). Cost Efficiency = DPS per 1,000 mana for one placement at every upgrade tier (base purchase, 1/x, 2/x …), averaged — so towers that stay efficient along their whole upgrade path score best. Speedrun emphasizes Cost Efficiency 50% · DPS 15% · Crowd 10% · Range 5% · Bossing 5% · Placement Count 15% (its crowd part favors cheap towers that clear enemies right at the portal). Zoologist is treated as an inverted-range exception: her bunnies provide reverse-path coverage, so gear maximizes damage first and minimizes RNG as a tie-breaker. Tiers are by percentile within the selected list: S 90th+ · A 75th+ · B 55th+ · C 35th+ · D 15th+ · F below the 15th. Scored against the act picked in Act Analysis, or the Fight enemy if no act is picked, using your whip, Account Buffs, Achievements and "Items I don't own". Click a column to sort.

Fantasy Teams

The best 5-tower teams if you owned every unit and item. Item copies are allowed across towers (two towers can both wear Ice Skates), so every tower gets its own best gear. Damage is against the act picked in Act Analysis, or the Fight enemy if no act is picked. Uses your Account Buffs and Achievements, Level 45, and the best reforge for each tower.

Goal Default range band (attacking towers, blank = ignore) to Crowd (for splash) Mana budget

Realistic rarity (ultra-rare items get limited copies: Arkhalis ×1, Balloon Pufferfish ×3)

Slot roles — optional range band per slot (e.g. one 40+ sniper, two 15–25 midrange). A blank slot uses the default band.

Items I don't own (shared with the Build optimizer)

Underrated: burn/frostburn ticks, ricochet, knockback, and stun aren't modeled, so towers that lean on them rank lower than they should. Gear is searched at each tower's max tier and reused at lower tiers. Each unit appears at most once per team (use placements for copies). Re-gear on a card re-optimizes only that tower (the others keep their one-copy items) and keeps its placements.

Account Buffs

Seafood Dinners (0–400)

Boss Slayer and Pack a Punch tiers live in the Achievements tab. Saved in this browser.

Whip

Like in-game: equip one from your inventory and it stays on for every match until you swap it. It affects every tower, so Build, Act Analysis, the Team, and Fantasy Teams all use it. Saved in this browser.

Achievements

Click a tier pip to set how far you've gotten (click the current one again to step back). ⚔ marks buffs the damage model uses; the rest are tracked for account planning. Saved in this browser.