MTG Land Calculator — Optimal Land Count & Mana Curve for Every Deck Format

Calculate the perfect number of lands, colored sources, and mana consistency for your Magic: The Gathering deck. Supports Limited, Standard, Modern, Commander, and custom formats.

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MTG Land Calculator

Select your deck format, enter average mana value, and specify color requirements to compute optimal land count and colored source targets.

Select deck format, enter average mana value, and specify colors, then click Calculate Lands to see results.

MTG Land Count Formula Explained

The MTG land count formula calculates the optimal number of lands for your deck based on deck size, average mana value, and ramp spells. The formula draws from Frank Karsten's widely-referenced Magic mathematics research.

Base Lands = floor(Deck Size × 0.40)
CMC Adjustment = round((Average CMC − 2.5) × 2)
Ramp Adjustment = −floor(Ramp Count × 0.5)
Optimal Lands = Base Lands + CMC Adjustment + Ramp Adjustment

Format Reference Table

FormatDeck SizeBase LandsTypical Range
Limited4016–1715–18
Standard / Modern602420–27
Commander / EDH9938–4033–42

The 40% baseline is a proven heuristic refined by competitive players. Adjustments account for your mana curve and acceleration to produce format-optimized recommendations.

How MTG Land Calculation Works

Building a consistent Magic deck starts with the right land count. Follow this framework to optimize your mana base:

  1. Identify your deck format — Limited (40 cards), Standard/Modern (60 cards), or Commander (99 cards) determines your baseline.
  2. Calculate average mana value — Sum the converted mana costs of all non-land cards and divide by the total non-land card count.
  3. Apply the 40% baseline — Multiply deck size by 0.40 to get your starting land count. A 60-card deck starts at 24 lands.
  4. Adjust for mana curve — For every 0.5 CMC above 2.5, add approximately 1 land. For every 0.5 below, subtract 1.
  5. Factor in ramp spells — Each low-cost ramp spell or mana rock reduces your land requirement by about 0.5 lands.
  6. Determine colored sources — Use Karsten's tables to ensure you have enough sources of each color for your pip requirements.

MTG Land Calculation Examples

Example 1: Standard Aggro Deck (60 cards, low curve)

Format: Standard — Avg CMC: 1.8 — Ramp: 0

Base: 60 × 0.40 = 24
CMC Adj: (1.8 − 2.5) × 2 = −1.4 → −1
Optimal: 24 − 1 = 23 lands

Example 2: Commander Midrange Deck (99 cards, moderate curve)

Format: Commander — Avg CMC: 3.2 — Ramp: 8

Base: 99 × 0.40 = 39.6 → 40
CMC Adj: (3.2 − 2.5) × 2 = +1.4 → +1
Ramp Adj: −floor(8 × 0.5) = −4
Optimal: 40 + 1 − 4 = 37 lands

Example 3: Limited Draft Deck (40 cards, typical curve)

Format: Limited — Avg CMC: 2.8 — Ramp: 1

Base: 40 × 0.40 = 16
CMC Adj: (2.8 − 2.5) × 2 = +0.6 → +1
Ramp Adj: −0
Optimal: 16 + 1 = 17 lands

MTG Color Source Mechanics & Karsten's Table

Having enough lands is only half the equation. You also need the right number of colored sources to consistently cast your spells on curve. Frank Karsten's landmark article provides the definitive reference for colored source requirements.

Colored Source Requirements (60-Card Deck)

Pip RequirementTurn 1Turn 2Turn 3Turn 4+
Single pip (e.g. 1U)14131211
Double pip (e.g. 1UU)—201918
Triple pip (e.g. UUU)——2322

Colored Source Requirements (Commander / 99-Card Deck)

Pip RequirementSources Needed
Single pip20–22
Double pip28–30
Triple pip34–36

Dual lands, fetch lands, and mana rocks that produce multiple colors all count toward each color's source total. This is why fetch-and-shock manabases are so powerful in competitive play.

People Also Ask About MTG Land Counts

The standard recommendation for a 60-card Magic deck is 24 lands, representing 40% of your deck. Aggressive decks with low mana curves (average CMC below 2.0) can run 20-22 lands, while control decks with higher curves (CMC above 3.0) often need 25-27 lands to consistently hit land drops through the mid-game.
Your mana curve directly impacts optimal land count. Decks with an average CMC below 2.0 can often run 20-22 lands in a 60-card format. Decks averaging 2.5-3.0 CMC typically need 24-25 lands. Decks with curves above 3.0 may require 26-28 lands. Each 0.5 deviation from the 2.5 baseline adjusts the recommendation by roughly 1 land.
A Commander deck (99 cards) should typically run 36-40 lands. The 40% baseline gives you 40 lands, but most Commander decks include 8-12 ramp spells or mana rocks, allowing you to reduce to 35-38 lands. Decks with very low curves and heavy ramp can go as low as 33, while landfall decks may want 42+.
The 40% rule is a baseline heuristic suggesting lands should comprise roughly 40% of your deck. In a 60-card deck this means 24 lands, in a 40-card Limited deck it means 16-17 lands, and in a 99-card Commander deck it means approximately 40 lands. This rule provides a proven starting point refined through decades of competitive play.
Using Frank Karsten's methodology, for a 60-card deck you need approximately 13 sources of a color to consistently cast single-pip spells on curve, and 18-19 sources for double-pip spells. For Commander (99 cards), you need about 20 sources for single pips and 28-30 for double pips. Dual lands count toward both colors.

Frequently Asked MTG Land Calculator Questions

Yes. The calculator includes presets for Limited/Draft (40 cards), Standard/Modern (60 cards), and Commander/EDH (99 cards). You can also enter a custom deck size for formats like Brawl (60 cards), Oathbreaker (60 cards), or any casual format with unique deck-building rules.
Sum the converted mana costs of all non-land cards in your deck and divide by the total number of non-land cards. For example, if you have 36 non-land cards with total CMC of 90, your average is 90/36 = 2.5. Many deck-building tools like Moxfield and Archidekt display this automatically.
Ramp spells and mana rocks costing 0-3 CMC provide the most reliable acceleration. Examples include Sol Ring, Arcane Signet, Llanowar Elves, Rampant Growth, and Farseek. Higher-cost ramp (4+ CMC) has less impact on land count reduction and may not warrant a full 0.5 land reduction per card.
The more colored pips in your spells' mana costs, the more sources of that color you need. A single-pip spell like "1U" needs about 12-13 blue sources in a 60-card deck. A double-pip spell like "1UU" needs 18-19 blue sources. Triple-pip spells like "UUU" require 22-23 sources for consistent casting.
Absolutely. Fetch lands (like Flooded Strand) that can search for dual lands with basic land types (like Hallowed Fountain) effectively count as sources of any color your manabase can produce. A single fetch land can represent access to all five colors if your deck includes the appropriate shock lands or triomes.
The MTG Land Calculator focuses on total land count and colored sources, while the Mana Curve Calculator helps you visualize and optimize your spell distribution across mana values. Both tools work together: use the mana curve calculator to refine your spell selection, then use this land calculator to build the optimal mana base.

MTG Land & Mana Glossary

Mana Curve

The distribution of spell costs across mana values in a deck. A smooth curve ensures you can use your mana efficiently every turn of the game.

Average CMC

The arithmetic mean of converted mana costs across all non-land cards. A key input for determining optimal land count using the land calculator formula.

Colored Sources

Lands or mana-producing permanents that can generate mana of a specific color. Dual lands count as sources for each color they can produce.

Pip Requirement

The number of colored mana symbols in a spell's cost. Single pip (1U), double pip (1UU), and triple pip (UUU) each demand different source counts.

Ramp Spell

A card that accelerates mana production beyond the normal one-land-per-turn rate, such as Rampant Growth, Arcane Signet, or Llanowar Elves.

Karsten's Table

Frank Karsten's mathematically-derived reference for how many colored sources a deck needs to consistently cast spells with specific pip requirements by a given turn.

Fetch Land

A land that can be sacrificed to search for a land with a specific basic land type, such as Flooded Strand finding a Plains or Island. Critical for mana fixing.

Mana Base

The complete set of lands and mana-producing cards in a deck. An optimized mana base ensures consistent access to the right colors at the right time.

Editorial Review & Methodology

This MTG land calculator was built and reviewed by the NumbrWiz Editorial Team. The land count formulas and colored source requirements are based on Frank Karsten's definitive mathematical analysis published in peer-reviewed Magic strategy articles, cross-referenced with current competitive deck-building standards across all major formats.

  • Formula verification: Land count formula validated against Karsten's published research, community data sets, and competitive decklist analysis across Standard, Modern, Pioneer, and Commander formats.
  • Edge case testing: Tested with extreme values including 40-card aggro decks, 99-card battlecruiser Commander builds, and five-color mana bases with heavy pip requirements.
  • UX review: Designed for intuitive input with format presets, clear validation, step-by-step breakdown, and accessible result presentation for players of all experience levels.

Transparency note: All calculations run client-side in your browser. No data is ever collected, stored, or transmitted. This is an unofficial fan utility tool. Magic: The Gathering and all related properties are trademarks of Wizards of the Coast. Results are for deck-building guidance; actual game outcomes vary with shuffle variance and matchup dynamics.

Page last reviewed: May 2026 · NumbrWiz Editorial Team