MTG Mana Curve Calculator
Analyse a Magic deck's mana curve by entering a count for each converted mana cost, then see the implied land count, the true average cost and whether the curve matches the target you set.
Curve In, Land Count Out
The page reads a distribution of non-land cards across seven converted-mana-cost slots, then reports what that implies for the deck. If the slots are empty it will suggest a curve first, based on the average cost you entered.
- A land baseline is computed first: eighteen lands, plus two for each additional colour, scaled to the deck size. The non-land count is the deck size minus that baseline.
- When every curve slot is zero, the tool fills them automatically. Bell-shaped weights centred on the average cost are normalised, then the non-land cards are dealt out across the seven slots with a largest-remainder method, so the counts add up to exactly the non-land total rather than overshooting it.
- The actual average cost is a weighted mean of the curve you entered: each slot's count multiplied by its cost, divided by the total cards.
- The reported land count is the deck size minus the total non-land cards on the curve, while the baseline it is measured against is the deck-size and colour estimate above. The recommended figure is that baseline with half a land knocked off for every ramp or mana-dork card you listed.
- Ramp and mana-dork cards are credited against that recommendation, since a card that produces mana covers part of what the lands would otherwise have to supply.
- The tool only comments on the curve when the actual average drifts more than half a mana from the target. Inside that band it reports that the curve looks good.
Reading a Deck's Curve
- Set the deck size. Sixty is the default for constructed play, with forty and one hundred also common.
- Enter the average converted mana cost you are aiming for, using the number that describes the deck's plan.
- Choose how many colours the deck plays. Each extra colour raises the land baseline by two, which lowers the non-land count the curve is fitted to.
- Enter the ramp or mana-dork count, then fill in a card count for each curve slot from zero through six, or leave them all at zero for a suggestion.
- Press Analyze deck, or edit any field, to see the land count, the actual average cost and the curve verdict.
The Default Sixty-Card Deck
The page runs its analysis as soon as it loads, so the default inputs produce a result without any interaction.
- With a deck size of sixty and two colours, the land baseline is eighteen plus four, or twenty-two, so the non-land count is thirty-eight.
- Because the curve starts empty, the tool generates one: it weights the seven slots with a bell centred on the average cost, normalises those weights, and deals out the thirty-eight non-land cards with a largest-remainder pass. That produces 1, 5, 13, 13, 5, 1 and 0 cards.
- Those suggested counts sum to exactly thirty-eight, so the suggestion fits the deck it describes instead of inventing cards the deck cannot hold.
- The reported land count is sixty minus thirty-eight, which is twenty-two, matching the baseline exactly. The recommended figure is that baseline less a credit of two lands for the four ramp pieces, giving twenty.
- The actual average cost comes out at exactly 2.50, on target, so the verdict reads that the curve looks good.
Setting Land Count Three Ways
| Alternative | Notes |
|---|
| The baseline rule | This is what the page applies when it estimates lands from deck size and colour count: eighteen lands, two more per extra colour, scaled to the deck size. It is a fast heuristic and a rough starting point rather than a tuned recommendation for a specific list. |
| Ramp-adjusted counts | A deck with cheap mana-producing creatures or artifacts can run fewer lands, because those cards do the work lands would otherwise do. The page credits each ramp or dork card with half a land in its recommended figure, which is a blunt version of the idea: real ramp ranges from a one-mana Elf to a four-mana rock, so treat the number as a starting point. |
| Curve-weighted counts | A low, aggressive curve needs fewer lands to function, while a top-heavy control curve needs more. Deriving land count from the cost distribution would be more responsive than a colour-count baseline, though the page deliberately keeps the baseline stable so that editing the curve does not silently move the target it is measured against. |
| Playtesting | The only reliable method. Shuffle and deal many opening hands and note how often you are stuck or flooded. Any calculator, including this one, is a first pass that a handful of real games will quickly refine. |
Deck Analysis Without Uploading a List
The whole calculation is local, so a decklist or a set of counts never leaves the browser.
- The curve inputs and every derived figure are computed in the page. Nothing is sent anywhere.
- There is no import of a card database and no lookup against an external service; the tool works only from the numbers on the curve.
- Once loaded, it keeps working offline, since the analysis needs no remote data.
- The only persisted value is the light or dark theme, held in local storage.
- The curve is not saved between visits, so note down a distribution you want to keep before you close the page.
Mana Curve Questions
How is the suggested curve kept within the deck?
The seven suggested counts come from normalised weights and are rounded with a largest-remainder pass, so they always add up to exactly the non-land total. That is what stops the suggestion from inventing more cards than the deck holds, and it is why the reported land count stays positive rather than turning negative.
How does the ramp or mana-dork count change the recommendation?
It is credited against the recommended land count at half a land per card. Raising the ramp figure from four to sixteen lowers the recommended count from twenty to fourteen, on the reasoning that mana-producing cards cover part of what the lands would otherwise provide. The suggested curve itself is not changed by this field.
How is the actual average cost calculated?
It is the weighted mean of the curve: each slot's card count is multiplied by that slot's converted mana cost, the products are added together, and the total is divided by the number of cards on the curve. If the curve is empty and the tool generates one, the average is computed from the generated counts, which is why it can land exactly on your target.
Why does the verdict mention the average and not the curve shape?
Because the only comparison the tool makes is between the actual average cost and the target you entered. If they are within half a mana it says the curve looks good, and it only flags a problem when they differ by more. It does not inspect whether the distribution is smooth, whether you have too many high-cost cards, or whether the deck can function on its land count.
Last verified: October 3, 2026
Launch MTG Mana Curve Calculator
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Maintained by Huang Bin · Last updated October 3, 2026