Pathfinder Encounter CR Calculator

ANA›Life Services Authority›National Calculator Authority›Pathfinder Encounter CR Calculator

.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }

Pathfinder Encounter CR Calculator

Calculate the effective Challenge Rating (CR) of a Pathfinder 1e encounter and determine its difficulty for your party.

Party Size (number of PCs)

Average Party Level (APL)

Monster CR (first / primary monster)

Number of that Monster

Additional Monster CR (optional, 0 to skip)

Number of Additional Monsters

Calculate Encounter CR Fill in the fields above and click Calculate.

function patCalc() { var partySize = parseFloat(document.getElementById('pat-party-size').value); var partyLevel = parseFloat(document.getElementById('pat-party-level').value); var cr1 = parseFloat(document.getElementById('pat-monster-cr').value); var count1 = parseInt(document.getElementById('pat-monster-count').value); var cr2 = parseFloat(document.getElementById('pat-monster2-cr').value); var count2 = parseInt(document.getElementById('pat-monster2-count').value);

// --- Input validation --- if (isNaN(partySize) || partySize 20) { document.getElementById('pat-result').innerHTML = 'Party size must be between 1 and 20.'; return; } if (isNaN(partyLevel) || partyLevel 20) { document.getElementById('pat-result').innerHTML = 'Party level must be between 1 and 20.'; return; } if (isNaN(cr1) || cr1 Primary monster CR must be at least 1/8 (0.125).'; return; } if (isNaN(count1) || count1 Number of primary monsters must be at least 1.'; return; } if (isNaN(cr2)) cr2 = 0; if (isNaN(count2)) count2 = 0;

// --- Adjusted Party Level --- // Pathfinder adjusts APL based on party size vs. standard 4-person party. // +1 APL if party >= 6; -1 APL if party = 6) apl += 1; if (partySize 0 && count2 > 0) { totalXP += count2 * getXP(cr2); }

// --- Determine Encounter CR from total XP --- var encounterCR = xpToCR(totalXP);

// --- Determine difficulty vs APL --- var aplClamped = Math.min(20, Math.max(1, Math.round(apl))); var thresholds = xpThresholds[aplClamped]; var difficulty = ''; var diffColor = ''; if (totalXP = 0 ? '+' + crDiff.toFixed(2) : crDiff.toFixed(2);

// --- XP per PC --- var xpPerPC = Math.round(totalXP / partySize);

// --- Build result HTML --- var html = '### Encounter Results '; html += ''; html += 'Adjusted Party Level (APL)' + apl + (apl !== partyLevel ? ' (adjusted from ' + partyLevel + ' for party size)' : '') + ''; html += 'Total Encounter XP' + totalXP.toLocaleString() + ' XP'; html += 'Encounter CRCR ' + formatCR(encounterCR) + ' (CR diff vs APL: ' + crDiffStr + ')'; html += 'Difficulty' + difficulty + ''; html += 'XP per PC' + xpPerPC.toLocaleString() + ' XP'; html += '';

// Difficulty scale reference html += 'Difficulty Scale (APL ' + aplClamped + '):'; html += ''; html += 'DifficultyXP RangeCR vs APL'; html += 'Easy' + thresholds[0].toLocaleString() + ' – ' + (thresholds[1]-1).toLocaleString() + 'APL – 1'; html += 'Average' + thresholds[1].toLocaleString() + ' – ' + (thresholds[2]-1).toLocaleString() + 'APL'; html += 'Challenging' + thresholds[2].toLocaleString() + ' – ' + (thresholds[3]-1).toLocaleString() + 'APL + 1'; html += 'Hard' + thresholds[3].toLocaleString() + ' – ' + (thresholds[4]-1).toLocaleString() + 'APL + 2'; html += 'Epic≥ ' + thresholds[4].toLocaleString() + 'APL + 3+'; html += '';

document.getElementById('pat-result').innerHTML = html; }

#### Formula

Step 1 – Adjusted Party Level (APL): APL = Average Party Level If party size ≥ 6: APL += 1 If party size ≤ 2: APL -= 1

Step 2 – Total Encounter XP: Total XP = Σ (Number of Monsteri × XP(CRi)) where XP(CR) is the standard Pathfinder XP value for that CR (e.g., CR 5 = 1,600 XP).

Step 3 – Encounter CR: Encounter CR = CR whose XP value is closest to Total Encounter XP (e.g., 3,200 XP ≈ CR 7)

Step 4 – Difficulty: Compare Total XP to the XP thresholds for the APL from Pathfinder Table 12-2: Easy (APL−1), Average (APL), Challenging (APL+1), Hard (APL+2), Epic (APL+3+)

Step 5 – XP per PC: XP per PC = Total Encounter XP ÷ Party Size

#### Assumptions & References

More Calculators

Read Next

Study Time Planner Authority Network America › Life Services Authority › National Calculator Authority .calc-container { max-width: 640px;...

References

Related Authorities

Life Services Authority › Professional Services Authority › Trade Services Authority › United States Authority ›