How to Use the TFT Bad Luck Calculator

This guide explains how to use the calculator during or after a TFT game. The tool estimates expected rerolls and gold cost from your current level, gold, target units, and known pool information. The numbers are estimates, not guarantees, because TFT outcomes still depend on random shop rolls and current game data.

1. Set your level and gold

Start with the two inputs in the header. Your level determines the shop odds for each unit cost, and your gold determines how many rerolls you can afford.

• Level: Enter your current in-game level from 1 to 10. The chance to see each cost changes by level.
• Gold: Enter the gold you are willing to spend. The calculator converts this into available rerolls by dividing gold by 2.

2. Add the champions you are rolling for

Use the champion list on the left side of the page. You can search by champion name or trait, then double-click a champion or drag it into the calculation area.

The list can be sorted by name, cost, origin, or class. If you are planning a reroll composition, sorting by cost is often the fastest way to find the units you need.

3. Configure each unit card

Each added champion becomes a unit card. Fill in the card based on your current board and what you know from scouting.

• Target: Choose 1-star, 2-star, or 3-star. The calculator uses 1, 3, or 9 total copies as the target.
• Duplicators to Use: Enter how many Champion Duplicators you plan to spend on that unit.
• Held: Enter how many copies you already own on board or bench.
• Enemy Target: Enter known copies of the exact same champion held by other players.
• Enemy Same Cost: Enter an estimate of other same-cost units removed from the pool by opponents. This is optional, but it can make the estimate more realistic when you have scouted carefully.

4. Read the results

Each card shows expected rolls and expected gold for that specific unit. When multiple units are active, the Total Summary estimates the roll-down as a combined scenario instead of simply adding every card together.

• Total Rolls: The estimated average number of shop refreshes needed for the active targets.
• Total Gold: The estimated roll cost, using 2 gold per reroll.
• Hit Prob.: The estimated chance to complete the active targets with the gold you entered.

5. Use the Bad Luck Meter carefully

After a game, you can enter how many rolls you actually spent and compare that result against the estimate. Treat the meter as a variance check, not as proof that a decision was correct or incorrect.

A result marked as unlucky means your roll-down took longer than the model expected for the inputs you gave it. The quality of the result depends on the accuracy of your level, target copies, and scouting information.

Practical tips

• Update enemy-held copies after each scouting round if you are using the tool during a live game.
• Use conservative estimates when you are unsure how many same-cost units are out of the pool.
• Do not treat expected rolls as a promise. Even good probabilities can miss in a single game.
• Use the result as one input alongside health, board strength, items, tempo, and lobby pressure.