diff --git a/cmd/prcost/main.go b/cmd/prcost/main.go
index 6c6bcef..7304b25 100644
--- a/cmd/prcost/main.go
+++ b/cmd/prcost/main.go
@@ -31,7 +31,7 @@ func main() {
 	// Org/Repo sampling flags
 	org := flag.String("org", "", "GitHub organization to analyze (optionally with --repo for single repo)")
 	repo := flag.String("repo", "", "GitHub repository to analyze (requires --org)")
-	samples := flag.Int("samples", 30, "Number of PRs to sample for extrapolation (30=fast/±18%, 50=slower/±14%)")
+	samples := flag.Int("samples", 50, "Number of PRs to sample for extrapolation (30=fast/±18%, 50=slower/±14%)")
 	days := flag.Int("days", 60, "Number of days to look back for PR modifications")
 
 	// Modeling flags
diff --git a/internal/server/integration_test.go b/internal/server/integration_test.go
index 775f863..ffe43d3 100644
--- a/internal/server/integration_test.go
+++ b/internal/server/integration_test.go
@@ -33,8 +33,8 @@ func TestOrgSampleStreamIntegration(t *testing.T) {
 	// Create request
 	reqBody := OrgSampleRequest{
 		Org:        "codeGROOVE-dev",
-		SampleSize: 30,
-		Days:       90,
+		SampleSize: 50,
+		Days:       60,
 	}
 	body, err := json.Marshal(reqBody)
 	if err != nil {
@@ -195,8 +195,8 @@ func TestOrgSampleStreamNoTimeout(t *testing.T) {
 	// Create request with larger sample size to ensure longer operation
 	reqBody := OrgSampleRequest{
 		Org:        "codeGROOVE-dev",
-		SampleSize: 30,
-		Days:       90,
+		SampleSize: 50,
+		Days:       60,
 	}
 	body, err := json.Marshal(reqBody)
 	if err != nil {
diff --git a/internal/server/server.go b/internal/server/server.go
index a06c2b5..1ba2431 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -144,8 +144,8 @@ type CalculateResponse struct {
 type RepoSampleRequest struct {
 	Owner      string       `json:"owner"`
 	Repo       string       `json:"repo"`
-	SampleSize int          `json:"sample_size,omitempty"` // Default: 30
-	Days       int          `json:"days,omitempty"`        // Default: 90
+	SampleSize int          `json:"sample_size,omitempty"` // Default: 50
+	Days       int          `json:"days,omitempty"`        // Default: 60
 	Config     *cost.Config `json:"config,omitempty"`
 }
 
@@ -154,8 +154,8 @@ type RepoSampleRequest struct {
 //nolint:govet // fieldalignment: API struct field order optimized for readability
 type OrgSampleRequest struct {
 	Org        string       `json:"org"`
-	SampleSize int          `json:"sample_size,omitempty"` // Default: 30
-	Days       int          `json:"days,omitempty"`        // Default: 90
+	SampleSize int          `json:"sample_size,omitempty"` // Default: 50
+	Days       int          `json:"days,omitempty"`        // Default: 60
 	Config     *cost.Config `json:"config,omitempty"`
 }
 
@@ -1478,10 +1478,10 @@ func (s *Server) parseRepoSampleRequest(ctx context.Context, r *http.Request) (*
 
 	// Set defaults
 	if req.SampleSize == 0 {
-		req.SampleSize = 30
+		req.SampleSize = 50
 	}
 	if req.Days == 0 {
-		req.Days = 90
+		req.Days = 60
 	}
 
 	// Validate reasonable limits (silently cap at 50)
@@ -1536,10 +1536,10 @@ func (s *Server) parseOrgSampleRequest(ctx context.Context, r *http.Request) (*O
 
 	// Set defaults
 	if req.SampleSize == 0 {
-		req.SampleSize = 30
+		req.SampleSize = 50
 	}
 	if req.Days == 0 {
-		req.Days = 90
+		req.Days = 60
 	}
 
 	// Validate reasonable limits (silently cap at 50)
diff --git a/internal/server/server_test.go b/internal/server/server_test.go
index dc47b60..39fe200 100644
--- a/internal/server/server_test.go
+++ b/internal/server/server_test.go
@@ -1483,8 +1483,8 @@ func TestParseRepoSampleRequest(t *testing.T) {
 			wantErr:        false,
 			wantOwner:      "testowner",
 			wantRepo:       "testrepo",
-			wantDays:       90,
-			wantSampleSize: 30,
+			wantDays:       60,
+			wantSampleSize: 50,
 		},
 		{
 			name:    "missing owner",
@@ -1570,8 +1570,8 @@ func TestParseOrgSampleRequest(t *testing.T) {
 			body:           `{"org":"testorg"}`,
 			wantErr:        false,
 			wantOrg:        "testorg",
-			wantDays:       90,
-			wantSampleSize: 30,
+			wantDays:       60,
+			wantSampleSize: 50,
 		},
 		{
 			name:    "missing org",
diff --git a/internal/server/static/index.html b/internal/server/static/index.html
index fc7095f..7c6dacd 100644
--- a/internal/server/static/index.html
+++ b/internal/server/static/index.html
@@ -1059,11 +1059,11 @@ <h1><a href="/">PR Cost Calculator</a></h1>
                         <input
                             type="number"
                             id="repoSampleSize"
-                            value="30"
+                            value="50"
                             min="1"
                             max="50"
                         >
-                        <div class="help-text">30 (fast, ±18% accuracy) or 50 (slower, ±14% accuracy)</div>
+                        <div class="help-text">50 (recommended, ±14% accuracy) or 30 (faster, ±18% accuracy)</div>
                     </div>
                     <div class="form-group">
                         <label for="repoDays">Days Back</label>
@@ -1099,11 +1099,11 @@ <h1><a href="/">PR Cost Calculator</a></h1>
                         <input
                             type="number"
                             id="orgSampleSize"
-                            value="30"
+                            value="50"
                             min="1"
                             max="50"
                         >
-                        <div class="help-text">30 (fast, ±18% accuracy) or 50 (slower, ±14% accuracy)</div>
+                        <div class="help-text">50 (recommended, ±14% accuracy) or 30 (faster, ±18% accuracy)</div>
                     </div>
                     <div class="form-group">
                         <label for="orgDays">Days Back</label>
@@ -2276,7 +2276,6 @@ <h3>Why calculate PR costs?</h3>
                                         }
 
                                         // Calculate average PR efficiency
-                                        const totalPRs = e.total_prs;
                                         const avgCodeChurnCost = e.code_churn_cost / totalPRs;
                                         const avgDeliveryDelayCost = e.delivery_delay_cost / totalPRs;
                                         const avgCodeChurnHours = e.code_churn_hours / totalPRs;