Universal Tower Defense Calculator
Your all-in-one tower defense toolkit.
DPS, upgrade cost (Yen), trait reroll odds, relic builds, summon/pity planning, boss checks, and team building — in one mobile-first tool dock.
Type to search units, traits, relic sets, or calculators.
Quick Start
New Player
Popular use cases
Codes mini-widget
FixingBugs!
+400 Gems, +25 Trait Rerolls
SorryForDmg
100 Gems, +10 Trait Rerolls
SorryForShutdown
100 Gems, +10 Trait Rerolls
Why code fails?
Common reasons
- Expired or region-limited code.
- Account level below requirement.
- Early Access flag required.
- Already redeemed on the account.
Data Coverage & Accuracy
Formulas: DPS = damage / SPA; DPS per cost = DPS / placement cost. Trait effects apply multiplicatively; pity caps attempts at threshold.
Trending
Community Highlights
Popular calculators
Jump into dedicated routes; query params stay shareable.
Mini FAQ
What is SPA?
Seconds per Attack. Lower SPA means faster attacks.
How is DPS calculated?
DPS = damage / SPA. Trait/Relic/level modifiers apply to damage and SPA, then recompute DPS.
Do two traits stack?
Trait slots cannot hold the same trait. Different traits apply multiplicatively in sequence.
Why may results differ from in-game?
Hidden multipliers, enemy DR, crit/passive effects, or outdated data. Use as guidance, verify in-game.
What is DPS per cost?
Final DPS divided by placement cost, used to gauge value.
How does reroll probability work?
Success = 1-(1-p)^n; attempts for probability P: n = ceil(log(1-P)/log(1-p)).
Do relic sets stack?
Relic bonuses multiply with traits/levels; sets can be extended via data JSON.
How is upgrade efficiency ranked?
By ΔDPS / ΔYen for each upgrade step; highest ratio is the best value.
What is mode fit?
TTK vs time limit plus weighted scoring from the mode preset.
How to share results?
Tool Dock state is encoded in the URL query. Copy the link to share the same inputs.
How to redeem codes?
Go to Codes page, copy an active code, open UTD in Roblox, paste in the codes menu, and confirm.
Why codes don't work?
They may be expired, level-locked, or Early Access only. Check requirements on the Codes widget.
What is trait pity?
Some banners guarantee a trait after N rolls; if pity threshold is set, attempts cap at that value.
How to pick a good trait?
High damage/SPA buffs like Ruler/Adept outperform small economy traits on DPS builds.
What is Virtual Realm?
A high-difficulty mode; expect higher boss HP and tighter time limits.