How are Gems calculated for time in Clash of Clans?

The Gem cost for time is not linear. Shorter times cost more Gems per hour. For example, skipping 1 hour costs 20 Gems, while skipping 1 day costs 260 Gems. This calculator uses the exact piecewise formula to give you precise results.

Is it better to use a Book of Building or Gems?

A Book of Building costs 925 Gems in the Trader shop. If your upgrade timer would cost more than 925 Gems to skip instantly (approx. 6 days or more), it is cheaper to buy the Book.

How much is 1 Gem worth in USD?

The value depends on the pack you buy. In the $99.99 pack (14,000 Gems), 1 Gem is worth approx. $0.007. In the $4.99 pack (500 Gems), 1 Gem is worth approx. $0.01.

Ultimate Clash of Clans Gem Calculator

The Ultimate Clash of Clans Gem Calculator is your essential tool for mastering resource management in Clash of Clans. Unlike others, this calculator offers advanced features: calculate gem costs for gold, elixir, dark elixir, and time for both Home Village and Builder Base, with a real-money cost estimator to plan purchases.

Whether rushing upgrades or stockpiling resources, this tool empowers strategic decisions. The delete option for individual history or favorite entries keeps your data organized.

Days

Hours

Minutes

Is this a Hero Upgrade?

Est. Cost: $0.00

Resource Type

Amount Needed

Est. Cost: $0.00

About the Clash of Clans Gem Calculator

Welcome to the most accurate Clash of Clans Gem Calculator on the web. Whether you are rushing your Town Hall, finishing a Hero upgrade for Clan War Leagues, or just curious about the cost of your next upgrade, this tool provides precise Gem costs based on the latest game formulas.

Why Use This Tool?

Save Money: Our unique "Smart Saver" feature analyzes your upgrade time and tells you if it's cheaper to buy a Magic Item (like a Book of Building) from the Trader instead of using Gems directly.
Plan Ahead: Know exactly how many Gems you need to farm or buy for your next big upgrade.
Real Currency Estimates: We convert the Gem cost into USD so you can see the real-world value of your in-game time.

How Gem Costs Work

Supercell uses a "diminishing returns" formula for time. This means the longer the upgrade, the cheaper the Gems are per hour. For example, skipping the last 10 minutes of an upgrade is very expensive per minute compared to skipping a 14-day upgrade.

Pro Tip: It is almost never worth it to Gem resources (Gold/Elixir). The conversion rate is very poor. You are much better off using Gems to boost your collectors or barracks to farm the resources yourself.

Frequently Asked Questions

How accurate is this calculator? +

This calculator uses the community-verified piecewise formulas that closely mimic the in-game values. It is accurate to within a few Gems for almost all time ranges.

Should I use Gems for Resources? +

Generally, no. The exchange rate for Gold and Elixir is very poor. It is much better value to use 1 Gem boosts on your collectors or to buy Training Potions to farm faster.

What is the most efficient use of Gems? +

The best use of Gems is buying the Book of Heroes (500 Gems) from the Trader if your Hero upgrade time is longer than ~3-4 days. This offers the best time-saved-per-gem ratio in the game.

Note: This is an unofficial tool, not affiliated with Supercell. Adhere to Supercell’s Fan Content Policy. Elevate your gameplay with this feature-rich, user-friendly calculator designed to give you an edge in Clash of Clans.

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