diff --git a/icu4c/source/tools/toolutil/ucbuf.c b/icu4c/source/tools/toolutil/ucbuf.c
index 5c19cef3076..9d6e4415079 100644
--- a/icu4c/source/tools/toolutil/ucbuf.c
+++ b/icu4c/source/tools/toolutil/ucbuf.c
@@ -407,16 +407,16 @@ ucbuf_getcx32(UCHARBUF* buf,UErrorCode* error) {
      * to c32 or not
      */
     if(c32==0xFFFFFFFF){
-		if(buf->showWarning) {
-			char context[20];
-			int32_t len = 20;
-			if(length  < len) {
-			  len = length; 
-			}
-			context[len]= 0 ; /* null terminate the buffer */
-			u_UCharsToChars( buf->currentPos, context, len);
-			fprintf(stderr,"Bad escape: [%c%s]...\n", c1,context);
-		}
+        if(buf->showWarning) {
+            char context[20];
+            int32_t len = 20;
+            if(length  < len) {
+                len = length; 
+            }
+            context[len]= 0 ; /* null terminate the buffer */
+            u_UCharsToChars( buf->currentPos, context, len);
+            fprintf(stderr,"Bad escape: [%c%s]...\n", c1,context);
+        }
         *error= U_ILLEGAL_ESCAPE_SEQUENCE;
         return c1;
     }else if(c32!=c2 || (c32==0x0075 && c2==0x0075 && c1==0x005C) /* for \u0075 c2=0x0075 and c32==0x0075*/){
diff --git a/icu4c/source/tools/toolutil/ucm.c b/icu4c/source/tools/toolutil/ucm.c
index d881b1b87fc..3ccedbb5bcc 100644
--- a/icu4c/source/tools/toolutil/ucm.c
+++ b/icu4c/source/tools/toolutil/ucm.c
@@ -934,7 +934,7 @@ ucm_addMapping(UCMTable *table,
                                              table->mappingsCapacity*sizeof(UCMapping));
         if(table->mappings==NULL) {
             fprintf(stderr, "ucm error: unable to allocate %d UCMappings\n",
-                            table->mappingsCapacity);
+                            (int)table->mappingsCapacity);
             exit(U_MEMORY_ALLOCATION_ERROR);
         }
 
@@ -950,7 +950,7 @@ ucm_addMapping(UCMTable *table,
         table->codePoints=(UChar32 *)uprv_malloc(table->codePointsCapacity*4);
         if(table->codePoints==NULL) {
             fprintf(stderr, "ucm error: unable to allocate %d UChar32s\n",
-                            table->codePointsCapacity);
+                            (int)table->codePointsCapacity);
             exit(U_MEMORY_ALLOCATION_ERROR);
         }
     }
@@ -960,7 +960,7 @@ ucm_addMapping(UCMTable *table,
         table->bytes=(uint8_t *)uprv_malloc(table->bytesCapacity);
         if(table->bytes==NULL) {
             fprintf(stderr, "ucm error: unable to allocate %d bytes\n",
-                            table->bytesCapacity);
+                            (int)table->bytesCapacity);
             exit(U_MEMORY_ALLOCATION_ERROR);
         }
     }
diff --git a/icu4c/source/tools/toolutil/ucmstate.c b/icu4c/source/tools/toolutil/ucmstate.c
index a769e1fe23d..5b90297b38e 100644
--- a/icu4c/source/tools/toolutil/ucmstate.c
+++ b/icu4c/source/tools/toolutil/ucmstate.c
@@ -529,16 +529,16 @@ ucm_processStates(UCMStates *states) {
             entry=states->stateTable[state][cell];
             if((uint8_t)MBCS_ENTRY_STATE(entry)>=states->countStates) {
                 fprintf(stderr, "ucm error: state table entry [%x][%x] has a next state of %x that is too high\n",
-                    state, cell, MBCS_ENTRY_STATE(entry));
+                    (int)state, (int)cell, (int)MBCS_ENTRY_STATE(entry));
                 exit(U_INVALID_TABLE_FORMAT);
             }
             if(MBCS_ENTRY_IS_FINAL(entry) && (states->stateFlags[MBCS_ENTRY_STATE(entry)]&0xf)!=MBCS_STATE_FLAG_DIRECT) {
                 fprintf(stderr, "ucm error: state table entry [%x][%x] is final but has a non-initial next state of %x\n",
-                    state, cell, MBCS_ENTRY_STATE(entry));
+                    (int)state, (int)cell, (int)MBCS_ENTRY_STATE(entry));
                 exit(U_INVALID_TABLE_FORMAT);
             } else if(MBCS_ENTRY_IS_TRANSITION(entry) && (states->stateFlags[MBCS_ENTRY_STATE(entry)]&0xf)==MBCS_STATE_FLAG_DIRECT) {
                 fprintf(stderr, "ucm error: state table entry [%x][%x] is not final but has an initial next state of %x\n",
-                    state, cell, MBCS_ENTRY_STATE(entry));
+                    (int)state, (int)cell, (int)MBCS_ENTRY_STATE(entry));
                 exit(U_INVALID_TABLE_FORMAT);
             }
         }
@@ -547,11 +547,11 @@ ucm_processStates(UCMStates *states) {
     /* is this an SI/SO (like EBCDIC-stateful) state table? */
     if(states->countStates>=2 && (states->stateFlags[1]&0xf)==MBCS_STATE_FLAG_DIRECT) {
         if(states->maxCharLength!=2) {
-            fprintf(stderr, "ucm error: SI/SO codepages must have max 2 bytes/char (not %x)\n", states->maxCharLength);
+            fprintf(stderr, "ucm error: SI/SO codepages must have max 2 bytes/char (not %x)\n", (int)states->maxCharLength);
             exit(U_INVALID_TABLE_FORMAT);
         }
         if(states->countStates<3) {
-            fprintf(stderr, "ucm error: SI/SO codepages must have at least 3 states (not %x)\n", states->countStates);
+            fprintf(stderr, "ucm error: SI/SO codepages must have at least 3 states (not %x)\n", (int)states->countStates);
             exit(U_INVALID_TABLE_FORMAT);
         }
         /* are the SI/SO all in the right places? */
@@ -573,7 +573,7 @@ ucm_processStates(UCMStates *states) {
     /* check that no unexpected state is a "direct" one */
     while(state<states->countStates) {
         if((states->stateFlags[state]&0xf)==MBCS_STATE_FLAG_DIRECT) {
-            fprintf(stderr, "ucm error: state %d is 'initial' - not supported except for SI/SO codepages\n", state);
+            fprintf(stderr, "ucm error: state %d is 'initial' - not supported except for SI/SO codepages\n", (int)state);
             exit(U_INVALID_TABLE_FORMAT);
         }
         ++state;
@@ -1034,7 +1034,7 @@ ucm_countChars(UCMStates *states,
      * must consist of only double-byte sequences
      */
     if(count>1 && states->outputType==MBCS_OUTPUT_2_SISO && length!=2*count) {
-        fprintf(stderr, "ucm error: SI/SO (like EBCDIC-stateful) result with %d characters does not contain all DBCS\n", count);
+        fprintf(stderr, "ucm error: SI/SO (like EBCDIC-stateful) result with %d characters does not contain all DBCS\n", (int)count);
         return -1;
     }