Blueprint Calculator

Blueprint Calculator

Blueprint Calculator for Once Human shows you exactly how much Active Starchrom and Energy Link you need to upgrade a legendary weapon blueprint from one star level to another. Pick a starting weapon and star level, pick the target star level, and the calculator lists the cost per star plus the running total. The old fragment-based upgrade path was retired with the Tech Rework update: every legendary blueprint now levels up with the same two-currency cost schedule, regardless of brand (Huntsman, Wanderer, Operator, Juggernaut, Beyonder, or Stranger).

Select Start WeaponSelect Start Weapon blueprint background

Select Start Weapon

Ideally, select your highest star weapon that you are willing to convert (it can be the same as the weapon you want).

Star 1
Star 2
Star 3
Star 4
Star 5
Star 6
Select Target WeaponSelect Target Weapon blueprint background

Select Target Weapon

Choose the weapon and star level you want to have at the end. This will be the resulting blueprint with the selected number of stars.

Star 1
Star 2
Star 3
Star 4
Star 5
Star 6

Upgrade Cost

Legendary blueprints level up with Active Starchrom (the premium upgrade currency, sometimes called Protochrome) and Energy Link. The fragment system was removed with the Tech Rework — fragments no longer unlock star tiers.

Per-star cost

Star 1 → 2:Active Starchrom1,600Energy Link3,000
Star 2 → 3:Active Starchrom4,000Energy Link6,000
Star 3 → 4:Active Starchrom6,000Energy Link9,000
Star 4 → 5:Active Starchrom8,000Energy Link12,000
Star 5 → 6:Active Starchrom10,000Energy Link15,000

Your Upgrade Path

The stars you want must be higher than the stars you currently have.