Yu-Gi-Oh! life points calculator

Battle damage in one line

damage = attacker ATK − defender ATK

A 2500 ATK monster attacking a 1800 ATK monster in attack position deals 700 damage to the defender’s controller. Attacking a monster in defence position works differently: if the attacker’s ATK is higher than the defender’s DEF the defender is destroyed and no damage is dealt (unless a card effect pierces), and if the DEF is higher the attacker’s controller takes the difference. Check the card text and current rulings for the details.

Halving, doubling and custom totals

Halving rounds up (2,551 → 1,276) and doubling multiplies by two (1,250 → 2,500). Pick Custom to start from any total from 1 to 99,999, and Tag duel to give each team of two one shared life total with both names on the label. “New duel” resets to the chosen starting total.

This is an unofficial fan tool. Yu-Gi-Oh! is a trademark of Konami and this site is not affiliated with them. Planning a deck? The hypergeometric distribution calculator gives the chance of opening with a specific card in your hand.

How to use the life points calculator

Pick the format and starting life points: 8,000 for a standard duel, 4,000 for Speed Duel, or a custom total from 1 to 99,999. Type the players’ names. Then enter an amount, or tap a quick button (100, 500, 1000 or 2000). Use damage to subtract it from a side’s life points and heal to add it. Half and double change a side’s total without typing a number. Every action goes into the log below, newest first, and Undo reverses the last one if you tapped the wrong side. New duel resets both totals.

Tag duels

Switch the format to Tag duel (2 v 2) to track two teams of two. Each team shares one life point total, and both partners’ names appear on the label. Damage, healing, halving and doubling all work on the team total in the same way as in a single duel.

Examples

• Direct attack: a 2500 ATK monster hits an empty field, so the other side takes 2500 damage: 8000 → 5500.
• Battle damage: 2500 ATK attacks 1800 ATK in attack position, so the defender’s side takes 700: 8000 → 7300.
• Halving: from 2551 life points, halving gives 1276, because the tool rounds up.
• Doubling: from 1250 life points, doubling gives 2500.
• Paying a cost: a card that costs 1000 life points is one damage entry of 1000 on your own side.

Coin and dice

Some cards ask for a coin toss or a die roll. The Flip coin and Roll die buttons give a fair random result and add it to the log, so both players can see it. A result written in the log is hard to dispute.

Speed Duel and other formats

Speed Duel uses a smaller deck, three monster zones and 4,000 starting life points, so choose 4,000 for it. Casual formats and house rules sometimes use other totals, such as 6,000 or 10,000. Pick Custom for those and enter the number once; New duel then resets to it every time.

Keeping the duel honest

The log records every change with the before and after totals. In a tournament, the official record is the one kept by the judge or on paper, but a clear log helps resolve disagreements about what was done and in what order. A duel ends when a side reaches zero life points, and the tool shows that side’s total as 0 and never below.