diff --git a/hc/accounts/models.py b/hc/accounts/models.py
index f80b5307..0d57324c 100644
--- a/hc/accounts/models.py
+++ b/hc/accounts/models.py
@@ -242,6 +242,13 @@ class Project(models.Model):
     api_key_readonly = models.CharField(max_length=128, blank=True)
     badge_key = models.CharField(max_length=150, unique=True)
 
+    def num_checks_available(self):
+        owner_profile = Profile.objects.for_user(self.owner)
+
+        from hc.api.models import Check
+        num_used = Check.objects.filter(project__owner=self.owner).count()
+        return owner_profile.check_limit - num_used
+
 
 class Member(models.Model):
     team = models.ForeignKey(Profile, models.CASCADE)
diff --git a/hc/accounts/tests/test_project_model.py b/hc/accounts/tests/test_project_model.py
new file mode 100644
index 00000000..1e17f2db
--- /dev/null
+++ b/hc/accounts/tests/test_project_model.py
@@ -0,0 +1,16 @@
+from hc.test import BaseTestCase
+from hc.accounts.models import Project
+from hc.api.models import Check
+
+
+class ProjectModelTestCase(BaseTestCase):
+
+    def test_num_checks_available_handles_multiple_projects(self):
+        # One check in Alice's primary project:
+        Check.objects.create(user=self.alice, project=self.project)
+
+        # One check in Alice's secondary project:
+        p2 = Project.objects.create(owner=self.alice)
+        Check.objects.create(user=self.alice, project=p2)
+
+        self.assertEqual(self.project.num_checks_available(), 18)
diff --git a/hc/api/views.py b/hc/api/views.py
index ff8147e2..7e0f3aa9 100644
--- a/hc/api/views.py
+++ b/hc/api/views.py
@@ -128,9 +128,7 @@ def create_check(request):
     created = False
     check = _lookup(request.project, request.json)
     if check is None:
-        user = request.project.owner
-        num_checks = Check.objects.filter(project__owner=user).count()
-        if num_checks >= user.profile.check_limit:
+        if request.project.num_checks_available() <= 0:
             return HttpResponseForbidden()
 
         check = Check(user=request.project.owner, project=request.project)
diff --git a/hc/front/views.py b/hc/front/views.py
index f39864ab..efd040c5 100644
--- a/hc/front/views.py
+++ b/hc/front/views.py
@@ -132,7 +132,7 @@ def my_checks(request):
         "tags": pairs,
         "ping_endpoint": settings.PING_ENDPOINT,
         "timezones": pytz.all_timezones,
-        "num_available": request.team.check_limit - len(checks),
+        "num_available": request.project.num_checks_available(),
         "sort": request.profile.sort,
         "selected_tags": selected_tags,
         "show_search": True,
@@ -245,8 +245,7 @@ def docs_resources(request):
 @require_POST
 @login_required
 def add_check(request):
-    num_checks = Check.objects.filter(user=request.team.user).count()
-    if num_checks >= request.team.check_limit:
+    if request.project.num_checks_available() <= 0:
         return HttpResponseBadRequest()
 
     check = Check(user=request.team.user, project=request.project)
diff --git a/hc/payments/views.py b/hc/payments/views.py
index b4335a86..3fbc7d49 100644
--- a/hc/payments/views.py
+++ b/hc/payments/views.py
@@ -58,7 +58,7 @@ def billing(request):
         "page": "billing",
         "profile": request.profile,
         "sub": sub,
-        "num_checks": Check.objects.filter(user=request.user).count(),
+        "num_checks": Check.objects.filter(project__owner=request.user).count(),
         "team_size": request.profile.member_set.count() + 1,
         "team_max": request.profile.team_limit + 1,
         "send_invoices_status": send_invoices_status,