.lm-calc-container {
padding: 25px;
background-color: #f4f7f9;
border: 2px solid #2c3e50;
border-radius: 12px;
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 650px;
margin: 20px auto;
color: #333;
}
.lm-calc-header {
text-align: center;
background-color: #2c3e50;
color: #ffffff;
padding: 15px;
margin: -25px -25px 25px -25px;
border-radius: 10px 10px 0 0;
}
.lm-calc-section {
margin-bottom: 20px;
padding: 15px;
background: #fff;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.lm-calc-section h3 {
margin-top: 0;
color: #2980b9;
font-size: 1.2em;
border-bottom: 1px solid #eee;
padding-bottom: 10px;
}
.lm-calc-group {
margin-bottom: 15px;
}
.lm-calc-group label {
display: block;
font-weight: bold;
margin-bottom: 5px;
font-size: 0.9em;
}
.lm-calc-group input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 5px;
box-sizing: border-box;
}
.lm-calc-btn {
width: 100%;
padding: 15px;
background-color: #27ae60;
color: white;
border: none;
border-radius: 5px;
font-size: 1.1em;
font-weight: bold;
cursor: pointer;
transition: background 0.3s;
}
.lm-calc-btn:hover {
background-color: #219150;
}
.lm-calc-result {
margin-top: 20px;
padding: 20px;
background-color: #ecf0f1;
border-radius: 8px;
text-align: center;
display: none;
}
.lm-calc-result h4 {
margin: 0 0 10px 0;
color: #7f8c8d;
}
.gem-total {
font-size: 2em;
color: #d35400;
font-weight: bold;
}
.lm-article {
max-width: 800px;
margin: 40px auto;
line-height: 1.6;
color: #444;
}
.lm-article h2 { color: #2c3e50; border-left: 5px solid #2980b9; padding-left: 10px; }
.lm-article table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.lm-article th, .lm-article td { border: 1px solid #ddd; padding: 12px; text-align: left; }
.lm-article th { background-color: #f2f2f2; }
How to Use the Lords Mobile Gem Calculator
In Lords Mobile, managing your gems efficiently is the difference between being a top-tier player and falling behind. This tool helps you calculate exactly how many gems you need for two main progression paths: skipping timers and upgrading the "Big Three" buildings.
Gem Costs for Buildings (The Big Three)
To reach Academy Level 25 and unlock T4 troops, you must upgrade the Battle Hall, Prison, and Altar to Level 25. These buildings require special items that are most commonly purchased with gems.
- War Tomes: Required for the Battle Hall.
- Steel Cuffs: Required for the Prison.
- Soul Crystals: Required for the Altar.
The standard rate for these items in the shop is 10,000 Gems for 1,000 items (or 10 Gems per item). Our calculator uses this standard conversion to tell you exactly how much your next upgrade will cost.
Speedup to Gem Conversion Rates
Speeding up research or construction directly with gems is often more expensive than using speedup items, but sometimes it is necessary during Hell Events or 24-hour Challenges. The game uses a non-linear scaling for time-to-gem conversion. Roughly:
| Time Duration |
Approximate Gem Cost |
| 1 Minute |
~2 Gems |
| 1 Hour |
~120 Gems |
| 24 Hours |
~1,500 Gems |
| 7 Days |
~10,000 Gems |
Example Calculation
If you have a research project that has 3 days and 12 hours remaining, and you also need 2,500 War Tomes to upgrade your Battle Hall:
- Speedup Cost: 3 days (approx 4,500 gems) + 12 hours (approx 900 gems) = ~5,400 Gems.
- Item Cost: 2,500 Items x 10 Gems = 25,000 Gems.
- Total: 30,400 Gems.
Tips for Saving Gems
1. Wait for Treasure Trove: Always keep your Treasure Trove at Level 9 and maxed out with a 30-day deposit to get the highest interest rates.
2. Colosseum Ranking: Focus on your hero lineup to maintain a high rank in the Colosseum for a steady flow of free gems every 3 hours.
3. Monster Hunting: Join an active guild that hunts high-level monsters. The guild gift boxes frequently contain gem rewards.
4. Buy Items in Bulk: Always buy the 1,000-count packs of building items (10,000 gems) rather than individual items to ensure you are getting the 10-gem-per-item rate.
function calculateLMGems() {
// Get Input Values
var days = parseFloat(document.getElementById('inputDays').value) || 0;
var hours = parseFloat(document.getElementById('inputHours').value) || 0;
var minutes = parseFloat(document.getElementById('inputMinutes').value) || 0;
var items = parseFloat(document.getElementById('inputItems').value) || 0;
// 1. Calculate Speedup Gem Cost
// Lords Mobile Logic: 24h = 1500, 7d = 10000, 30d = 40000
// We use a smoothed scale for the calculator
var totalMinutes = (days * 1440) + (hours * 60) + minutes;
var speedupGems = 0;
if (totalMinutes > 0) {
// Simple scaling formula that mimics LM in-game logic for larger chunks
// 1 min ~ 2 gems, but it gets cheaper per min as time increases
if (totalMinutes <= 60) {
speedupGems = totalMinutes * 2;
} else if (totalMinutes 0 && itemGems > 0) {
breakdownText = "(" + speedupGems.toLocaleString() + " for time + " + itemGems.toLocaleString() + " for items)";
} else if (speedupGems > 0) {
breakdownText = "(Calculated for speedups only)";
} else if (itemGems > 0) {
breakdownText = "(Calculated for special building items only)";
}
document.getElementById('breakdownDisplay').innerHTML = breakdownText;
document.getElementById('resultArea').style.display = 'block';
}