The Comprehensive Guide
The Ultimate OSRS Potion Usage & Restoration Guide
Success in Old School RuneScape (OSRS) is built on a foundation of inventory management. Whether you are venturing into the God Wars Dungeon or grinding out 99 Slayer, your potions are your lifelines. But potions are expensive—and for Ironmen, they represent hours of tedious herb gathering. Our OSRS Potion Usage Calculator helps you find the mathematical "Sweet Spot" for your supplies.
1. Understanding Prayer Restoration Math
Restoration in OSRS is rarely a flat number; it is almost always calculated based on your current level. The formula for a standard Prayer Potion is:
This means that as your Prayer level increases, every dose of potion becomes more valuable. At level 1, a dose restores 7 points. At level 99, a dose restores 31 points. This is why training Prayer isn't just about unlocking new buffs—it's about increasing your Supply Efficiency.
Comparison: Potion Restoration at Key Levels
| Prayer Level | Prayer Potion (Dose) | Super Restore (Dose) | Sanfew Serum (Dose) |
|---|---|---|---|
| 43 (Protect Overheads) | 17 | 18 | 18 |
| 70 (Piety) | 24 | 25 | 25 |
| 77 (Rigour) | 26 | 27 | 27 |
| 99 (Max) | 31 | 32 | 32 |
2. The Holy Wrench: Is It Worth a Slot?
The Holy Wrench (unlocked from the Rum Deal quest) provides a hidden bonus to prayer restoration. Many players argue over whether the extra points are worth the inventory slot. Our calculator provides the "Break-Even" point:
- Under 10 doses: The Holy Wrench typically restores fewer points than a single extra dose would. Leave it in the bank.
- Over 14 doses: At level 99, the wrench adds +2 per dose. If you are carrying 4 potions (16 doses), you gain 32 extra points—the equivalent of an extra Super Restore dose.
For long-duration activities like The Inferno or Hard Mode Tob solo, the Holy Wrench is mandatory supply efficiency.
3. Divine Potions vs. Standard Boosts
Divine potions (made using Crystal Shards) are a double-edged sword. They provide a "Locked" boost for 5 minutes, preventing the standard 1-level-per-minute decay. This is massive for DPS, but the costs add up.
When to use Divine: Bosses where every max hit matters (Nex, Raids, Vorkath). When NOT to use Divine: Low-level slayer tasks or activities where you are mostly AFK. Standard Super Combats are much cheaper and the decay is negligible over long periods.
4. Calculating Cost-per-Hour (GP/Hr)
A major feature of our OSRS Potion Calculator is the cost analysis. In 2026, a 4-dose Prayer Potion might cost 10,000 GP. If your task uses 15 points per minute, you are burning roughly 29,000 GP per hour in prayer alone. Combine this with Divine Super Combats and Cannonballs, and your "Profit" might actually be a "Loss."
Our tool allows you to input current GE prices to see your true overhead. This is essential for determining if a boss is worth camping or if you should shift to a lower-cost setup.
5. The Ironman Supply Chain: Managing Herbs
For Ironmen, Ranarr and Snapdragon seeds are the most valuable drops in the game. Using our calculator, an Ironman can determine exactly how many "Hours of Combat" they have left in their bank. By increasing your Prayer Bonus or using Lazy Flicking, you can stretch 100 Ranarr weeds into 150 hours of slayer instead of 100. Efficiency here isn't just about speed; it's about survival.
6. Niche Potions: The 2026 Meta
Moonlight Moth Mixes
Introduced with Varlamore, these Hunter-gathered supplies restore 22 points regardless of level. For mid-level accounts (Prayer levels 30-60), these are better and cheaper than standard Prayer Potions. Our calculator includes these under the "Varlamore Supplies" tab.
Ancient Brews
Found in the Nex rewards pool, these boost Magic and Prayer at the cost of Attack, Strength, and Defense. They are the only way to boost Prayer above your maximum level, allowing for "Over-Healing" of prayer before a high-burst phase.
7. Strategy: The "Perfect" Inventory
Use our Trip Simulator to input your Boss Kill Time and encounter length. The calculator will tell you exactly how many doses of Antifire, Antipoison, Combat Boost, and Prayer you need. Pack only what you require, and fill the remaining slots with Anglerfish or Saradomin Brews to ensure you stay in the fight longer.
8. Conclusion
Knowledge is power, but in OSRS, calculations are profit. Don't waste your hard-earned GP or your limited Ironman herbs on guesswork. Use the OSRS Potion Usage Calculator to optimize your restoration, understand your costs, and maximize your efficiency in every corner of Gielinor.