diff --git a/app/routers/ui.py b/app/routers/ui.py
index 29aa4a8..b58b025 100644
--- a/app/routers/ui.py
+++ b/app/routers/ui.py
@@ -21,7 +21,7 @@ from app.models.todo import Todo
 from app.constants import COLORS, MATERIALS
 from app.filamentdb import available_colors, available_materials, get_stock
 from app.stl import get_stl_dir, list_stl_files
-from app.stl_analysis import analyse, get_cache_map
+from app.stl_analysis import analyse, get_cache_map  # noqa: F401 used in job_detail route
 
 router = APIRouter()
 templates = Jinja2Templates(directory="app/templates")
@@ -222,6 +222,18 @@ def job_detail(job_id: int, request: Request, db: Session = Depends(get_db)):
     })
 
 
+@router.post("/jobs/{job_id}/analyse")
+def analyse_job_file(job_id: int, db: Session = Depends(get_db)):
+    from fastapi import HTTPException
+    job = db.query(PrintJob).filter(PrintJob.id == job_id).first()
+    if not job or not job.file_name:
+        raise HTTPException(status_code=404, detail="Job or file not found")
+    db.query(StlCache).filter_by(filename=job.file_name).delete()
+    db.commit()
+    analyse(job.file_name, db)
+    return RedirectResponse(url=f"/jobs/{job_id}", status_code=HTTP_303_SEE_OTHER)
+
+
 @router.post("/jobs/{job_id}/log")
 def add_job_log(job_id: int, message: str = Form(...), db: Session = Depends(get_db)):
     db.add(JobLog(job_id=job_id, message=message.strip()))
diff --git a/app/templates/job_detail.html b/app/templates/job_detail.html
index a0c0136..0b34cb6 100644
--- a/app/templates/job_detail.html
+++ b/app/templates/job_detail.html
@@ -70,8 +70,15 @@
   {# ── STL geometry ── #}
   <div class="col-md-6">
     <div class="card h-100">
-      <div class="card-header text-secondary small text-uppercase fw-normal" style="border-color:#21262d">
-        File &amp; Geometry
+      <div class="card-header border-secondary d-flex align-items-center justify-content-between" style="border-color:#21262d">
+        <span class="text-secondary small text-uppercase fw-normal">File &amp; Geometry</span>
+        {% if job.file_name and not job.file_name.endswith('.gcode') %}
+        <form method="POST" action="/jobs/{{ job.id }}/analyse">
+          <button type="submit" class="btn btn-outline-secondary btn-sm py-0 px-2" style="font-size:.75rem">
+            <i class="bi bi-cpu me-1"></i>Compute now
+          </button>
+        </form>
+        {% endif %}
       </div>
       <div class="card-body">
         {% if job.file_name %}
@@ -91,7 +98,7 @@
         {% elif job.file_name and job.file_name.endswith('.gcode') %}
         <p class="text-secondary small mb-0">Geometry not available for gcode files.</p>
         {% elif job.file_name %}
-        <p class="text-secondary small mb-0">Not yet analysed — will be computed on next upload.</p>
+        <p class="text-secondary small mb-0">Not yet analysed.</p>
         {% else %}
         <p class="text-secondary small mb-0">No file attached.</p>
         {% endif %}