Rust Genetics Calculator
This Rust genetics calculator (the Seed Grader) scores up to 8 seeds with an S–D gene ranking and a full breakdown — know exactly which seeds are worth keeping and which to discard.
Built by Frozen · tested on the live patch · Updated 3 July 2026
How the Seed Grader ranks Rust seeds
Every seed in Rust has a 6-gene genome made up of G, Y, H, W and X. The Seed Grader scores each gene by its in-game value and gives the seed a single S–D rating so you can sort dozens of seeds in seconds without doing the math by hand.
Gene values
- G — 3.0. Growth speed. The single best gene in the game.
- Y — 2.5. Yield. Slightly less impactful than G but still excellent.
- W — 1.0. Water hog. Useless and dangerous in crossbreeding (high tie-weight).
- H — 0.5. Hardy. Niche use; resists condition swings but most farms keep light and water at 100%.
- X — 0.0. Empty. No effect on the plant; lethal in crossbreeding.
Grading scale
- S — God tier. 5–6 G/Y genes and zero W or X. Plant immediately.
- A — Strong. 4+ G/Y, at most 1 W or H. Excellent breeding parent.
- B — Decent. 3 G/Y, up to 2 weak genes. Use as a parent if you have nothing better.
- C — Weak. 2 G/Y or several W genes. Only useful as filler if you're desperate.
- D — Discard. Mostly W and X. Throw it away — never breed with it.
How to use the rankings
After grading, keep your S and A seeds for breeding into the God Clone Planner. Plant your best seed at the centre of a 3×3 planter and use 6+ A or B seeds as parents around it. Discard everything graded D — it can't help and only risks corrupting your output through the crossbreeding tie-weight system.
Why grading beats eyeballing
It's easy to look at GGYWGY and think "that's a strong seed." But it has 2 G, 2 Y, 1 W and 1… wait, you already lost track. The grader removes guesswork — paste in any seed and it tells you instantly whether it's worth keeping.