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Blueprint Calculator
Blueprint Calculator for Once Human helps you plan the most efficient path to upgrade your legendary weapon blueprints. Enter your current blueprint's star level and any accumulated XP, set your target star level, and input all your available fragments (Common, Fine, Epic, and Legendary) for each brand. The calculator will determine the optimal upgrade path, considering same-name bonuses from duplicate legendary blueprints and accounting for XP loss during brand conversions. It shows you exactly when to swap between brands, which weapons to use for same-name bonuses, and how many blueprint conversions you'll need. Whether you want to upgrade your current weapon or convert it to a different one with higher stars, this tool will help you minimize fragment usage and maximize XP gains across all available brands (Huntsman, Wanderer, Operator, Juggernaut, Beyonder, and Stranger).
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).
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.
XP Calculation
Legendary Blueprint XP Requirements
Your Upgrade Path
The stars you want must be higher than the stars you currently have.
Legendary Weapon Fragments
Enter your legendary weapon fragments, so the calculator can adjust the path for the best same-name bonus.
Scourge
MPS5 - Kumawink
MPS7 - Outer Space
KAM - Abyss Glance
Blueprint Fragments Overview
Enter your common, fine and epic weapon fragments below. The total XP are only using the same-name bonus of the weapon you have the most fragments of in this class (if you would convert to this weapon), but the upgrade path analysis below will automatically adjust the XP by using blueprint conversion attempts. You just need to simply read how to upgrade your weapon below, everything is done for you.
| Brand | Common | Fine | Epic | Legendary | Legendary (Same-Name) | Total XP |
|---|---|---|---|---|---|---|
 Huntsman | 0 | 0 | 0 | |||
 Wanderer | 0 | 0 | 0 | |||
 Operator | 0 | 0 | 0 | |||
 Juggernaut | 0 | 0 | 0 | |||
 Beyonder | 0 | 0 | 0 | |||
 Stranger | 0 | 0 | 0 |
Upgrade Path Analysis
Select start and target weapons to see upgrade path analysis
Extra Blueprint Conversion Guide
A comprehensive guide explaining blueprint conversions in detail. Guide by Doomeris.
Upgrading Armor and Weapons - Full Guide
A comprehensive guide explaining the basics of Once Human's blueprint system: how conversions work, different fragment types, upgrading mechanics, and where to find fragments. Guide by Doomeris.