How to Use Giant Seaweed Calculator
The Giant Seaweed Calculator helps Old School RuneScape players plan every step of the seaweed-to-glass Crafting grind.
- Enter Your Current Level or XP — Toggle between Level and XP input modes, then enter your current Crafting level or total XP. The Giant Seaweed Calculator converts between the two automatically.
- Set Your Target — Enter the level or XP you want to reach. Common milestones include level 46 for Unpowered Orbs, level 87 for Empty Light Orbs, and level 99 for the Crafting cape.
- Enter Materials You Already Have — Fill in how many Giant Seaweed, Buckets of Sand, and Molten Glass you currently own. The Giant Seaweed Calculator subtracts these from the required totals.
- Choose a Superglass Make Method — Select whether you use 2 seaweed + 12 sand, 3 seaweed + 18 sand without collecting extra glass, or 3 seaweed + 18 sand and collecting the bonus glass.
- Select a Glassblowing Product — Pick what you plan to blow (Beer Glass, Vial, Unpowered Orb, Empty Light Orb, etc.). The Giant Seaweed Calculator shows the level requirement, XP per item, number of items you can make, and total Crafting XP.
- Read the Results — The calculator shows required seaweed, sand, casts, total glass, and whether your current stock is sufficient.
Formula & Theory — Giant Seaweed Calculator
The Giant Seaweed Calculator is based on the OSRS Superglass Make mechanics and standard glassblowing XP values:
Casts needed = ceil(Glass needed / Glass per cast)
Seaweed needed = Casts needed × Seaweed per cast
Sand needed = Casts needed × Sand per cast
Total glass = Owned glass + Casts × Glass per cast
Items made = floor(Total glass)
Crafting XP = Items made × XP per item
XP still needed = max(0, Target XP − Start XP − Crafting XP)| Method | Seaweed / cast | Sand / cast | Glass / cast (avg) |
|---|---|---|---|
| 2 Giant Seaweed + 12 Sand | 2 | 12 | 13 |
| 3 Giant Seaweed + 18 Sand (no pick) | 3 | 18 | 21 |
| 3 Giant Seaweed + 18 Sand (pick up) | 3 | 18 | 28.8 |
Glassblowing Products
| Product | Crafting Level | XP each |
|---|---|---|
| Beer Glass | 1 | 17.5 |
| Candle Lantern | 4 | 19.0 |
| Oil Lamp | 12 | 25.0 |
| Vial | 33 | 35.0 |
| Fishbowl | 42 | 42.5 |
| Unpowered Orb | 46 | 52.5 |
| Lantern Lens | 49 | 55.0 |
| Empty Light Orb | 87 | 70.0 |
Assumptions and Limits
The Giant Seaweed Calculator uses average glass-per-cast figures from community estimates. Actual yields may vary due to the random bonus glass mechanic. Magic XP from Superglass Make casts (78 XP each) is shown separately and is not included in the Crafting XP total.
Use Cases for Giant Seaweed Calculator
The Giant Seaweed Calculator is especially useful for these OSRS players:
- Ironman accounts — Ironmen must farm all resources themselves. Use the Giant Seaweed Calculator to plan exactly how many seaweed farming runs and sand mining trips are needed before a Superglass Make session.
- Crafting level 87 goal — Level 87 unlocks Empty Light Orb, one of the most sought-after Crafting milestones. The Giant Seaweed Calculator shows the total seaweed and sand required to reach it from any starting level.
- Crafting level 99 goal — Planning the full journey to the Crafting cape is straightforward with the Giant Seaweed Calculator. Enter level 1 (or your current level) and target 99 to see the complete material list.
- Session planning — Before a Superglass Make session, check whether your current stock of Giant Seaweed and Buckets of Sand is sufficient or how many more you need to gather.
- Product selection — Compare the XP rates of different glassblowing products to choose the fastest path to your target level.
Whether you are a new Ironman planning your first seaweed farm or a veteran player optimizing the fastest route to 99 Crafting, the Giant Seaweed Calculator gives you a clear, accurate breakdown of every material and XP requirement along the way.