Efficiency is the most important metric for choosing drills in Dig a Garden. This guide ranks every drill by Diglets per hour and calculates the return on investment for each upgrade. In a game where your drills operate continuously—even while you are offline—understanding your true earning rate is the only way to optimize your progression. Because your drills automatically dig up items and convert them into Diglets, the speed and rarity bonuses of your equipment directly dictate your wealth. However, raw speed isn't everything; the cost of upgrades and the hidden bottleneck of inventory caps mean that the most expensive drill isn't always the best immediate choice.
Diglets Per Hour Rankings
The following table ranks every drill in Dig a Garden by its estimated Diglets per hour output. These calculations assume the drill is actively running on a plot and the player is regularly selling their inventory before it fills up.
| Rank | Drill | Tier | Type | Estimated Diglets/Hour |
|---|---|---|---|---|
| 1 | Galaxy Drill | S | Premium | 40K-60K |
| 2 | Mega Borer | S | F2P | 35K-55K |
| 3 | Deep Piercer | A | F2P | 20K-30K |
| 4 | Turbo Digger | A | F2P | 15K-25K |
| 5 | Group Drill | A | F2P | 18K-28K |
| 6 | Standard Borer | B | F2P | 8K-12K |
| 7 | Starter Drill | C | F2P | 3K-6K |
Note: Diglets per hour estimates depend on item sell values and may vary with game updates.
Understanding Item Rarity and Drill Tier Correlation
Your Diglets per hour isn't just determined by how fast a drill spins; it is heavily influenced by the quality of items the drill unearths. Higher-tier drills have hidden modifiers that increase the probability of digging up higher-rarity items.
In Dig a Garden, items are divided into four rarity classes: Common (low sell value), Unusual (moderate sell value), Scarce (high sell value), and Legendary (massive sell value). A C-tier Starter Drill will overwhelmingly dig up Common items, whereas an S-tier Mega Borer will consistently pull Scarce items and has a respectable chance at Legendaries. This rarity multiplier is the primary reason why higher-tier drills see such massive jumps in their Diglets per hour estimates.
| Drill Tier | Common Drop Rate | Unusual Drop Rate | Scarce Drop Rate | Legendary Drop Rate |
|---|---|---|---|---|
| C (Starter) | 85% | 12% | 3% | <1% |
| B (Standard) | 65% | 25% | 9% | 1% |
| A (Turbo/Deep/Group) | 40% | 35% | 20% | 5% |
| S (Mega/Galaxy) | 20% | 30% | 35% | 15% |
Cost-Effectiveness Analysis
Not all drills are equally cost-effective. Here is the ROI for each drill upgrade:
| Upgrade | Cost | Extra Diglets/Hr | Break-Even Time | Value Rating |
|---|---|---|---|---|
| Free Group Drill | 0 | +12K-22K | Instant | 10/10 |
| Starter → Standard | ~5K | +5K-6K | ~1 hr | 9/10 |
| Standard → Turbo | ~20K | +10K-13K | ~2 hrs | 8/10 |
| Turbo → Deep | ~50K | +5K-8K | ~8 hrs | 7/10 |
| Any A → Mega | ~100K | +15K-25K | ~5 hrs | 9/10 |
The free Group Drill and the Mega Borer are the two most cost-effective upgrades in the game.
How-To: Calculate Your Own Drill ROI
While community estimates are helpful, the best way to make upgrade decisions is to calculate your exact ROI based on your current setup. Here is a step-by-step walkthrough:
- Record Your Starting Diglets: Open your inventory and note exactly how many Diglets you have.
- Set a Timer: Place your current drill on your plot, ensure your inventory is empty, and start a 60-minute timer.
- Sell and Record: After one hour, sell all items in your inventory. Note your new Diglets total.
- Calculate Current Hourly Rate: Subtract your starting Diglets from your ending Diglets. This is your true Diglets/Hour.
- Determine Break-Even Time: Look at the cost of your next drill upgrade. Divide the upgrade cost by your expected extra Diglets per hour. For example, if the upgrade costs 50,000 Diglets and promises an extra 10,000 Diglets/Hour, your break-even time is 5 hours.
Offline Progression and Inventory Caps
One of the most critical mechanics in Dig a Garden is offline progression. When you log off, your drills continue to dig on your plot. However, this is heavily restricted by your plot's inventory capacity. If your inventory fills up while you are offline, your drill stops earning Diglets until you log back in and sell.
This means that faster drills will hit the inventory cap much sooner. If you only play once a day, an S-tier drill might fill your inventory in just 3 hours, leaving you with 21 hours of zero earnings. A slower B-tier drill might take 10 hours to fill the inventory, resulting in more total offline Diglets if you are away for a full 24-hour period. Always upgrade your inventory capacity alongside your drills!
Offline Earning Capacity by Drill Tier
The table below demonstrates how inventory caps interact with different drill tiers over a standard 8-hour offline period (e.g., while sleeping or at school).
| Drill | Diglets/Hour | Inventory Cap | Time to Fill Cap | Total Offline Diglets (8 Hrs) |
|---|---|---|---|---|
| Starter Drill | 4,500 | 20,000 | ~4.4 Hours | 20,000 |
| Standard Borer | 10,000 | 20,000 | ~2 Hours | 20,000 |
| Turbo Digger | 20,000 | 40,000 | ~2 Hours | 40,000 |
| Deep Piercer | 25,000 | 40,000 | ~1.6 Hours | 40,000 |
| Mega Borer | 45,000 | 80,000 | ~1.7 Hours | 80,000 |
As shown above, if you do not upgrade your inventory capacity, upgrading your drill can actually result in wasted potential. Always prioritize inventory expansions when playing Dig a Garden to ensure your high-tier drills can operate continuously while you are away.
F2P vs Premium Drill Showdown
The current endgame meta in Dig a Garden is dominated by two S-tier drills: the Mega Borer (F2P) and the Galaxy Drill (Premium). Understanding the nuances between these two top-tier options is vital for late-game players.
The Mega Borer is the ultimate goal for free-to-play players. It requires a significant grind to unlock, costing 100,000 Diglets, but it offers S-tier performance that rivals premium options. Its high Scarce and Legendary drop rates make it the most profitable F2P item in the game.
The Galaxy Drill, on the other hand, is a premium S-tier drill that is currently off-sale. It boasts the absolute highest Diglets per hour in the game (40K-60K), but its limited availability makes it a rare sight. Players who acquired it during its sale window hold a distinct advantage, though the margin over the Mega Borer is surprisingly slim.
| Feature | Mega Borer (F2P) | Galaxy Drill (Premium) |
|---|---|---|
| Cost | 100,000 Diglets | Robux (Off-Sale) |
| Estimated Diglets/Hr | 35K-55K | 40K-60K |
| Rarity Bonus | High Legendary Chance | Highest Legendary Chance |
| Availability | Always Craftable/Buyable | Limited Time Only |
| Value Rating | 9/10 | 6/10 (Cost-prohibitive) |
For 99% of the player base, the Mega Borer is the definitive endgame drill. The marginal 5K-10K Diglets per hour increase offered by the Galaxy Drill does not justify the extreme Robux cost, especially since the Mega Borer can consistently hit the upper end of its earning range when paired with a maxed-out inventory.
Optimal Upgrade Path Walkthrough
Navigating the early and mid-game economy can be tricky. To maximize your Diglets per hour without wasting currency, follow this optimized progression path:
Phase 1: The Group Drill Jump When you start the game, you are given the C-tier Starter Drill. Do not spend hours grinding with it. Play actively for about 30-45 minutes to earn 5,000 Diglets, then immediately upgrade to the Standard Borer. However, the biggest power spike early on is the Group Drill. Join The Heap Roblox community group to claim the A-tier Group Drill for free. This instantly boosts your earnings from ~6K/Hr to ~23K/Hr with zero cost.
Phase 2: The Mid-Grind With the Group Drill, your inventory will fill up fast. Use your initial earnings to buy your first inventory expansion. Once your inventory can hold at least 40K Diglets worth of items, start saving for the Turbo Digger (20K Diglets). The Turbo Digger digs faster than the Group Drill, meaning you will hit inventory caps quicker, so keep upgrading that storage.
Phase 3: Piercing the Depths After securing the Turbo Digger, you have a choice: skip the Deep Piercer or buy it. The Deep Piercer costs 50K Diglets but only offers a marginal 5K-8K Diglets/Hr increase over the Turbo. If you play actively and can sell frequently, the Deep Piercer is worth it. If you rely heavily on offline earnings, you might want to save your Diglets for the final tier instead.
Phase 4: The Mega Borer Endgame Save up 100,000 Diglets for the Mega Borer. This is the pinnacle of F2P progression. Once equipped, ensure your inventory is maxed out to accommodate the massive influx of Scarce and Legendary items. From here, your Diglets per hour will skyrocket, allowing you to purchase cosmetic items or help friends with their plots.
FAQ
Q: How accurate are Diglets per hour estimates? A: These are community-estimated ranges based on average item values. Actual earnings may vary based on item rarity distribution and sell prices, which can change with updates.
Q: Why is the Group Drill so high on the efficiency list? A: Because it costs zero Diglets and provides A-tier performance. Any free drill that performs at A-tier level is incredibly cost-effective.
Q: Should I calculate my own Diglets per hour? A: Yes! Track your earnings over a few hours and calculate the average. This helps you make informed upgrade decisions based on your actual performance.
Q: How do inventory caps affect my Diglets per hour? A: If your inventory fills up, your drill stops earning Diglets, effectively dropping your hourly rate to zero until you sell. This is especially important for offline progression; a fast drill with a small inventory will waste hours of potential digging time while you are away.
Q: Does the Galaxy Drill dig up more Legendary items than the Mega Borer? A: Yes, the Galaxy Drill has a slightly higher hidden modifier for Legendary drops (roughly 15% compared to the Mega Borer's estimated 12-13%). However, this difference is minor and rarely justifies the premium price tag given the Mega Borer's already excellent Legendary drop rate.
Q: What happens to my offline earnings if my inventory is completely full? A: Once your plot's inventory reaches maximum capacity, your drill will physically stop operating. Any time spent offline with a full inventory yields zero Diglets and zero items. You must log back in, sell your items, and manually restart the drill to begin earning again.
Q: Should I upgrade my inventory before buying a better drill? A: In most cases, yes. A higher-tier drill digs faster and finds rarer items, which fills your inventory much quicker. If you upgrade your drill without upgrading your inventory, you will frequently hit the cap, effectively negating the speed advantage of the new drill, particularly during overnight sessions.