Fantasy Baseball Dynasty Trade Calculator

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Fantasy Baseball Dynasty Trade Calculator

Evaluate long-term value, age curves, and draft pick assets.

SIDE A (Receiving)
None Tier 1: Elite (Ohtani/Acuna) Tier 2: All-Star (Tatis/Riley) Tier 3: Solid Starter Tier 4: Bench/Low-End Starter Tier 5: Prospect / Deep Flyer
Developing (Under 24) Prime (24 – 29) Veteran (30 – 33) Deep Decline (34+)
None Tier 1: Elite Tier 2: All-Star Tier 3: Solid Starter Tier 4: Bench/Low-End Starter Tier 5: Prospect
No Pick 1st Round Rookie/FYPD 2nd Round Rookie/FYPD 3rd+ Round Pick
SIDE B (Giving)
None Tier 1: Elite (Ohtani/Acuna) Tier 2: All-Star (Tatis/Riley) Tier 3: Solid Starter Tier 4: Bench/Low-End Starter Tier 5: Prospect / Deep Flyer
Developing (Under 24) Prime (24 – 29) Veteran (30 – 33) Deep Decline (34+)
None Tier 1: Elite Tier 2: All-Star Tier 3: Solid Starter Tier 4: Bench/Low-End Starter Tier 5: Prospect
No Pick 1st Round Rookie/FYPD 2nd Round Rookie/FYPD 3rd+ Round Pick

How to Use the Dynasty Trade Calculator

Fantasy baseball dynasty leagues differ from redraft leagues because player value is tied to longevity and future potential. This calculator uses a proprietary weighting system based on player tiers, age-based value curves, and draft pick capital to determine if a trade is fair.

The Valuation Logic

  • Player Tiers: We assign base values to players based on their statistical output (Elite = 100 points, Prospect = 15 points).
  • The Age Curve: In dynasty, a 22-year-old is worth more than a 32-year-old with the same stats. We apply a 1.15x multiplier for youth and a 0.6x multiplier for players in significant decline.
  • The "2-for-1" Penalty: Our logic automatically applies a small consolidation premium. The side receiving the single best player often "wins" a trade unless the volume side offers significant depth.

Example Calculation

Imagine Trading a 31-year-old Elite Pitcher (Side B) for a 22-year-old All-Star Infielder and a 1st Round Pick (Side A).

  • Side B Value: 100 (Elite) x 0.85 (Veteran Age) = 85 Points.
  • Side A Value: [75 (All Star) x 1.15 (Youth)] + 40 (1st Pick) = 126.25 Points.
  • Result: Side A wins significantly due to the age gap and pick compensation.

Winning Your Dynasty League

Don't just trade for today. Successful dynasty managers use calculators like this to identify when to "sell high" on aging veterans and when to "buy low" on underperforming prospects. Always consider your league's specific settings (H2H vs Roto) when finalizing your decision.

function calculateTrade() { // Side A Data var a1_t = parseFloat(document.getElementById('a1_tier').value); var a1_a = parseFloat(document.getElementById('a1_age').value); var a2_t = parseFloat(document.getElementById('a2_tier').value); var a_p = parseFloat(document.getElementById('a_pick').value); // Side B Data var b1_t = parseFloat(document.getElementById('b1_tier').value); var b1_a = parseFloat(document.getElementById('b1_age').value); var b2_t = parseFloat(document.getElementById('b2_tier').value); var b_p = parseFloat(document.getElementById('b_pick').value); // Calculation Logic // Side A – Player 2 gets a standard prime multiplier of 1.0 for simplicity in this tool var totalA = (a1_t * a1_a) + (a2_t * 1.0) + a_p; var totalB = (b1_t * b1_a) + (b2_t * 1.0) + b_p; var resultArea = document.getElementById('result-area'); var verdict = document.getElementById('verdict-text'); var pointBreakdown = document.getElementById('point-breakdown'); var barA = document.getElementById('bar-a'); var barB = document.getElementById('bar-b'); resultArea.style.display = "block"; if (totalA === 0 && totalB === 0) { verdict.innerHTML = "Please enter player data."; return; } // Determine Percentages for Bar var combined = totalA + totalB; var perA = (totalA / combined) * 100; var perB = (totalB / combined) * 100; barA.style.width = perA + "%"; barB.style.width = perB + "%"; var diff = Math.abs(totalA – totalB); var ratio = totalA > totalB ? (totalA / totalB) : (totalB / totalA); if (diff < 10 || ratio totalB) { verdict.innerHTML = "✅ Side A Wins"; resultArea.className = "unbalanced"; } else { verdict.innerHTML = "✅ Side B Wins"; resultArea.className = "unbalanced"; } pointBreakdown.innerHTML = "Side A Value: " + totalA.toFixed(1) + " | Side B Value: " + totalB.toFixed(1) + ""; }

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