MTG Commander lands calculator

How the number is chosen

The calculator uses no model of its own. It starts from the band for your deck's profile, moves one land at a time for your ramp, your curve and your commander, and never goes under 33 without saying so. The bands and the rules of thumb come from our guide.

The bands

What moves the count

• A curve at 4.0 or higher starts one land up in the heavy and landfall bands.
• Seven or fewer ramp pieces add a land and 12 or more trim one, because two cheap ramp pieces are worth about one land. The low-curve band already assumes 12, so its trims come at 14 and 16.
• A commander that costs six or more adds a land, so it comes down on curve.
• These moves stay inside the band. Only the aggressive low curve switch goes past it: it trims one more land, never below 30 and never on a heavy curve or a landfall deck, and any count under 33 comes with a warning.

Your opening hands, computed

Computed for a 99-card library with the hypergeometric distribution. The average is 7 times the land count divided by 99; the fourth land by turn 4 counts the opening seven plus the draws of turns one, two, three and four, because nobody skips the first draw in a multiplayer game, with no mulligan.

The rules behind it

Four rules the page relies on: a Commander deck is 100 cards including the commander (Comprehensive Rules 903.5a); every card but basic lands is a single copy (903.5b); a double-faced card is its front face while it sits in your hand or library (712.8a); in a multiplayer game your first mulligan is free (103.5c).

Read the full guide: How many lands go in an MTG Commander deck?