Last updated: 5 September 2026

Terraria NPC Happiness Calculator Price Modifier & Pylon Status (1.4.5)

Pick any town NPC, choose their biome, and toggle neighbors to instantly see the exact shop price modifier — plus whether they sell a Pylon. All 26 town NPC preferences are verified against terraria.wiki.gg for version 1.4.5. Key 1.4.5 change: pylons no longer require a happiness threshold — any vendor NPC (except the Tavernkeep) sells their biome's Pylon as long as at least one other NPC lives nearby.

01NPC Happiness Calculator

02How the Happiness System Works

Every town NPC has a preferred biome and opinions about their neighbors. These preferences combine multiplicatively into a price modifier: a 94% modifier means items cost 6% less; an 88% modifier means 12% off; a hated biome or neighbor can push prices above 100%.

• Loved biome or neighbor: ×0.88 (12% cheaper).
• Liked biome or neighbor: ×0.94 (6% cheaper).
• Neutral — no preference: ×1.00.
• Disliked biome or neighbor: ×1.06 (6% surcharge).
• Hated biome or neighbor: ×1.12 (12% surcharge).
• Solitude bonus: ×0.95 when at most 2 other NPCs are within 25 tiles AND at most 3 other NPCs are in the 25–120 tile ring.
• Crowding penalty: ×1.05 per each additional NPC beyond 3 others in the 25-tile radius (a 4th, 5th, etc. neighbor).

All modifiers multiply together. The result is hard-capped at a minimum of 67% (maximum discount possible) and a maximum of 150% (maximum surcharge). The Princess is a special case: she has no biome or neighbor preferences of her own, is liked (×0.94) by every other NPC around her, and she dynamically loves (×0.88) up to three of the NPCs nearest to her.

03Pylon Changes in 1.4.5

Version 1.4.5 removed the happiness threshold for pylon sales entirely. Before this patch, an NPC needed a price modifier at or below 90% to stock their biome's Pylon. Now any vendor NPC sells the Pylon for their current biome as long as at least one other NPC lives nearby:

• Tavernkeep — no longer sells Pylons as of patch 1.4.5.4; his shop is fully stocked after defeating Golem.
• Skeleton Merchant and Traveling Merchant — never sold Pylons; they are not town NPCs.
• Two new Pylons in 1.4.5: Underworld Pylon (The Underworld biome) and Aether Pylon (Aether / Shimmer biome).
• Universal Pylon — sold by the Zoologist once the Bestiary is 100% complete; no biome requirement and no nearby NPCs needed to activate.

04Best NPC Pairings for Maximum Discount

The single best discount in the game doesn't need a biome at all: the Princess loves the first three NPCs placed next to her, and three inner neighbors sit exactly at the crowding threshold (neutral — the penalty only starts at a 4th). Everywhere else, the best combinations stack a loved or liked biome with a loved neighbor, keeping the cluster to 2 NPCs to preserve the solitude bonus (×0.95). Space each cluster at least 120 tiles from the next to maintain the outer-ring condition:

1. Princess with any 3 neighbors nearby — she loves her first three neighbors (×0.88 each) and has no biome preference (×1.00); with exactly 3 inner neighbors the crowding penalty hasn't started yet: 1.00 × 0.88 × 0.88 × 0.88 ≈ 68% — the closest anyone gets to the 67% floor outside a holiday event.
2. Santa Claus + Princess in Snow — Santa loves Snow (×0.88) and loves the Princess as a neighbor (×0.88), plus the solitude bonus (×0.95): 0.88 × 0.88 × 0.95 ≈ 73.6% (December only — Santa Claus disappears after the holiday event ends).
3. Arms Dealer + Nurse in Desert — Desert is liked (×0.94), Nurse is loved (×0.88): 0.94 × 0.88 × 0.95 ≈ 79%.
4. Mechanic + Goblin Tinkerer in Snow — Snow is liked (×0.94), Goblin Tinkerer is loved (×0.88): 79%.
5. Goblin Tinkerer + Mechanic in Underground / Cavern — Underground is liked (×0.94), Mechanic is loved (×0.88): 79%.