Mobile Game Session Length & Retention Calculator

ANA›Life Services Authority›National Calculator Authority›Mobile Game Session Length & Retention 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; } }

Mobile Game Session Length & Retention Calculator

Calculate average session length, retention rates (Day 1, Day 7, Day 30), churn rate, and lifetime value indicators for mobile games.

### Session Data

Total Sessions in Period

Total Playtime (minutes)

Average Sessions per Active User per Day

### Retention Cohort Data

Day 0 (Install) Users

Day 1 Returning Users

Day 7 Returning Users

Day 30 Returning Users

### Monetization & Engagement

Daily Active Users (DAU)

Monthly Active Users (MAU)

ARPDAU — Avg Revenue per DAU ($)

Calculate

function mobCalc() { const totalSessions = parseFloat(document.getElementById('mob-total-sessions').value); const totalPlaytime = parseFloat(document.getElementById('mob-total-playtime').value); const sessPerDay = parseFloat(document.getElementById('mob-sessions-per-day').value); const day0 = parseFloat(document.getElementById('mob-day0-users').value); const day1 = parseFloat(document.getElementById('mob-day1-users').value); const day7 = parseFloat(document.getElementById('mob-day7-users').value); const day30 = parseFloat(document.getElementById('mob-day30-users').value); const dau = parseFloat(document.getElementById('mob-dau').value); const mau = parseFloat(document.getElementById('mob-mau').value); const arpdau = parseFloat(document.getElementById('mob-arpdau').value);

const errors = [];

// Validate session fields if provided if (!isNaN(totalSessions) || !isNaN(totalPlaytime)) { if (isNaN(totalSessions) || totalSessions day0) errors.push("Day 1 users cannot exceed Day 0 users."); if (!isNaN(day7) && day7 > day0) errors.push("Day 7 users cannot exceed Day 0 users."); if (!isNaN(day30) && day30 > day0) errors.push("Day 30 users cannot exceed Day 0 users."); if (!isNaN(day7) && !isNaN(day1) && day7 > day1) errors.push("Day 7 users cannot exceed Day 1 users (retention typically decreases)."); if (!isNaN(day30) && !isNaN(day7) && day30 > day7) errors.push("Day 30 users cannot exceed Day 7 users (retention typically decreases)."); }

// Validate DAU/MAU if provided if (!isNaN(dau) || !isNaN(mau)) { if (isNaN(dau) || dau mau) errors.push("DAU cannot exceed MAU."); }

if (errors.length > 0) { document.getElementById('mob-result').innerHTML = 'Please fix the following:' + errors.map(e => '').join('') + ''; return; }

let html = '### Results '; html += 'MetricValueBenchmark';

// ── Session Length ────────────────────────────────────────────────────────── if (!isNaN(totalSessions) && !isNaN(totalPlaytime) && totalSessions >= 1 && totalPlaytime >= 1) { // Avg Session Length (minutes) = Total Playtime / Total Sessions const avgSession = totalPlaytime / totalSessions; const avgSessionBench = avgSession 40 min)'; html += 'Avg Session Length' + avgSession.toFixed(2) + ' min' + avgSessionBench + '';

if (!isNaN(sessPerDay) && sessPerDay > 0) { // Daily Playtime per User = Avg Session Length × Sessions per Day const dailyPlaytime = avgSession * sessPerDay; html += 'Daily Playtime per User' + dailyPlaytime.toFixed(1) + ' min' + (dailyPlaytime '; } }

// ── Retention Rates ───────────────────────────────────────────────────────── if (!isNaN(day0) && day0 >= 1) { if (!isNaN(day1)) { // Day 1 Retention = (Day 1 Users / Day 0 Users) × 100 const r1 = (day1 / day0) * 100; const r1Bench = r1 50%)'; html += 'Day 1 Retention' + r1.toFixed(1) + '%' + r1Bench + ''; } if (!isNaN(day7)) { // Day 7 Retention = (Day 7 Users / Day 0 Users) × 100 const r7 = (day7 / day0) * 100; const r7Bench = r7 30%)'; html += 'Day 7 Retention' + r7.toFixed(1) + '%' + r7Bench + ''; } if (!isNaN(day30)) { // Day 30 Retention = (Day 30 Users / Day 0 Users) × 100 const r30 = (day30 / day0) * 100; const r30Bench = r30 20%)'; html += 'Day 30 Retention' + r30.toFixed(1) + '%' + r30Bench + ''; } if (!isNaN(day1)) { // Churn Rate (Day 1) = (1 - Day1 Retention) × 100 const churn1 = ((day0 - day1) / day0) * 100; html += 'Day 1 Churn Rate' + churn1.toFixed(1) + '%' + (churn1 > 80 ? '⚠ Very high churn' : churn1 > 65 ? '⚠ High churn' : '✓ Acceptable') + ''; } if (!isNaN(day1) && !isNaN(day7)) { // Day 1→7 Retention Drop = ((Day1 - Day7) / Day1) × 100 const drop17 = day1 > 0 ? ((day1 - day7) / day1) * 100 : 0; html += 'Day 1→7 Drop-off' + drop17.toFixed(1) + '%' + (drop17 > 60 ? '⚠ High drop-off' : drop17 > 40 ? '⚠ Moderate drop-off' : '✓ Good retention curve') + ''; } }

// ── DAU/MAU Stickiness ────────────────────────────────────────────────────── if (!isNaN(dau) && !isNaN(mau) && dau >= 1 && mau >= 1) { // Stickiness = DAU / MAU × 100 const stickiness = (dau / mau) * 100; const stickyBench = stickiness 30%)'; html += 'DAU/MAU Stickiness' + stickiness.toFixed(1) + '%' + stickyBench + '';

if (!isNaN(arpdau) && arpdau >= 0) { // Monthly Revenue Estimate = ARPDAU × DAU × 30 const monthlyRev = arpdau * dau * 30; // LTV Estimate (simplified) = ARPDAU / Daily Churn Rate // Daily Churn ≈ 1 - (DAU/MAU)^(1/30) approximation const dailyRetention = Math.pow(dau / mau, 1 / 30); const dailyChurn = 1 - dailyRetention; const ltv = dailyChurn > 0 ? (arpdau / dailyChurn) : 0;

html += 'Est. Monthly Revenue$' + monthlyRev.toLocaleString('en-US', {minimumFractionDigits:2, maximumFractionDigits:2}) + 'Based on DAU × ARPDAU × 30'; if (ltv > 0) { html += 'Est. Player LTV$' + ltv.toFixed(2) + 'ARPDAU ÷ Daily Churn Rate'; html += 'Daily Churn Rate' + (dailyChurn * 100).toFixed(2) + '%Derived from DAU/MAU ratio'; } } }

html += '';

// ── Interpretation Summary ────────────────────────────────────────────────── html += '#### Interpretation '; if (!isNaN(totalSessions) && !isNaN(totalPlaytime) && totalSessions >= 1) { const avg = totalPlaytime / totalSessions; if (avg = 10 && avg = 1) { const r1 = (day1 / day0) * 100; if (r1 = 35) html += ''; } if (!isNaN(dau) && !isNaN(mau) && dau >= 1 && mau >= 1) { const s = (dau / mau) * 100; if (s >= 20) html += ''; else html += ''; } html += '';

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

#### Formulas Used

Average Session Length = Total Playtime (min) ÷ Total Sessions

Daily Playtime per User = Avg Session Length × Sessions per Active User per Day

Day N Retention Rate = (Users Active on Day N ÷ Day 0 Install Users) × 100

Day 1 Churn Rate = (Day 0 Users − Day 1 Users) ÷ Day 0 Users × 100

DAU/MAU Stickiness = (Daily Active Users ÷ Monthly Active Users) × 100

Monthly Revenue Estimate = ARPDAU × DAU × 30

Daily Churn Rate = 1 − (DAU ÷ MAU)1/30

Player LTV = ARPDAU ÷ Daily Churn Rate

#### Assumptions & References

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References

• ANA
• Life Services Authority