Mana Curve Calculator

How it is calculated

You type one number per card, separated by commas or spaces, and the tool takes a plain average:

average = (sum of all costs) ÷ (number of costs)

Every entry counts as one card, so a card you play three copies of has to be listed three times. The tool also shows the card count and the total mana. A cost of 0 is allowed and pulls the average down, which is why lands matter: include them and the average falls, leave them out and it describes only your spells. Mana costs must be whole numbers from 0 up, so a decimal such as 2.5, a negative number, a word or a symbol such as 2R makes the whole list invalid and no result is shown. Empty entries between commas are ignored.

Common mistakes

• Typing a decimal comma. The list is split at commas, so "2,5" is read as two cards costing 2 and 5 (average 3.50), not one card costing 2.5. A decimal point such as 2.5 is rejected outright, since mana costs are whole numbers.
• Listing each card name once when the deck has several copies. A four-of costing 2 must appear as 2, 2, 2, 2 or the average is skewed toward single copies.
• Mixing lands in without noticing. Eight lands entered as 0 drop the average from 2.93 to 1.91, so compare only decks counted the same way.
• Using the colour symbols or text such as "2R" or "X" instead of a number. Any non-numeric entry makes the result disappear; convert the cost to its total mana value first.
• Reading the average as the ideal curve. Two decks can share 3.00 while one is built from 1- and 5-cost cards and the other from 3-cost cards only, so look at the spread as well.