diff --git a/bin/partyfuse.py b/bin/partyfuse.py
index 4b6ab90e..07317c72 100755
--- a/bin/partyfuse.py
+++ b/bin/partyfuse.py
@@ -626,7 +626,7 @@ class Gateway(object):
             "st_atime": ts,
             "st_mtime": ts,
             "st_ctime": ts,
-            "st_blocks": int((sz + 511) / 512),
+            "st_blocks": -int(-sz // 512),
         }
 
     def stat_file(self, ts, sz):
@@ -638,7 +638,7 @@ class Gateway(object):
             "st_atime": ts,
             "st_mtime": ts,
             "st_ctime": ts,
-            "st_blocks": int((sz + 511) / 512),
+            "st_blocks": -int(-sz // 512),
         }
 
 
diff --git a/bin/u2c.py b/bin/u2c.py
index 1d9696bd..61a27340 100755
--- a/bin/u2c.py
+++ b/bin/u2c.py
@@ -398,7 +398,7 @@ class MTHash(object):
             self.csz = chunksz
 
             chunks = {}
-            nchunks = int(math.ceil(fsz / chunksz))
+            nchunks = -int(-fsz // chunksz)
             for nch in range(nchunks):
                 self.work_q.put(nch)
 
@@ -725,7 +725,7 @@ def up2k_chunksize(filesize):
     stepsize = 512 * 1024
     while True:
         for mul in [1, 2]:
-            nchunks = math.ceil(filesize * 1.0 / chunksize)
+            nchunks = -int(-filesize // chunksize)
             if nchunks <= 256 or (chunksize >= 32 * 1024 * 1024 and nchunks <= 4096):
                 return chunksize
 
diff --git a/copyparty/httpsrv.py b/copyparty/httpsrv.py
index e56ccd52..20916745 100644
--- a/copyparty/httpsrv.py
+++ b/copyparty/httpsrv.py
@@ -318,7 +318,7 @@ class HttpSrv(object):
 
         self.srvs.append(sck)
         self.bound.add((ip, port))
-        self.nclimax = math.ceil(self.args.nc * 1.0 / nlisteners)
+        self.nclimax = -int(-self.args.nc // nlisteners)
         Daemon(
             self.thr_listen,
             "httpsrv-n{}-listen-{}-{}".format(self.nid or "0", ip, port),
diff --git a/copyparty/up2k.py b/copyparty/up2k.py
index bf5036fe..3027b1dc 100644
--- a/copyparty/up2k.py
+++ b/copyparty/up2k.py
@@ -5704,7 +5704,7 @@ def up2k_chunksize(filesize: int) -> int:
     stepsize = 512 * 1024
     while True:
         for mul in [1, 2]:
-            nchunks = math.ceil(filesize * 1.0 / chunksize)
+            nchunks = -int(-filesize // chunksize)
             if nchunks <= 256 or (chunksize >= 32 * 1024 * 1024 and nchunks <= 4096):
                 return chunksize
 
diff --git a/copyparty/util.py b/copyparty/util.py
index 0045ec8a..1fd8fb25 100644
--- a/copyparty/util.py
+++ b/copyparty/util.py
@@ -1355,7 +1355,7 @@ class MTHash(object):
             self.csz = chunksz
 
             chunks: dict[int, tuple[str, int, int]] = {}
-            nchunks = int(math.ceil(fsz / chunksz))
+            nchunks = -int(-fsz // chunksz)
             for nch in range(nchunks):
                 self.work_q.put(nch)
 
diff --git a/docs/chunksizes.py b/docs/chunksizes.py
index 7b24d664..231f1e8d 100755
--- a/docs/chunksizes.py
+++ b/docs/chunksizes.py
@@ -26,7 +26,7 @@ def up2k_chunksize(filesize):
     stepsize = 512 * 1024
     while True:
         for mul in [1, 2]:
-            nchunks = math.ceil(filesize * 1.0 / chunksize)
+            nchunks = -int(-filesize // chunksize)
             if nchunks <= 256 or (chunksize >= 32 * 1024 * 1024 and nchunks <= 4096):
                 return chunksize