diff --git a/Cantera/src/converters/Reaction.cpp b/Cantera/src/converters/Reaction.cpp
index f6bf047b7..35913f83e 100755
--- a/Cantera/src/converters/Reaction.cpp
+++ b/Cantera/src/converters/Reaction.cpp
@@ -64,7 +64,7 @@ namespace ckr {
     }
 
     void Reaction::write(ostream& s) const {
-        int nl = lines.size();
+        int nl = static_cast<int>(lines.size());
         for (int nn = 0; nn < nl; nn++) {
             s << lines[nn] << endl;
         }
@@ -111,10 +111,10 @@ namespace ckr {
 
 double Reaction::stoichCoefficient(const string& s) const {
     int k;
-    int nr = reactants.size();
+    int nr = static_cast<int>(reactants.size());
     for (k = 0; k < nr; k++) 
         if (reactants[k].name == s) return -reactants[k].number;
-    int np = products.size();
+    int np = static_cast<int>(products.size());
     for (k = 0; k < np; k++) 
         if (products[k].name == s) return products[k].number;
     return 0.0;
@@ -125,8 +125,8 @@ double Reaction::stoichCoefficient(const string& s) const {
  *  @todo could be made faster
  */
 bool Reaction::operator==(const Reaction& r) const {
-    int nr = reactants.size();
-    int np = products.size();
+    int nr = static_cast<int>(reactants.size());
+    int np = static_cast<int>(products.size());
     if (int(r.reactants.size()) != nr || 
         int(r.products.size()) != np || r.thirdBody != thirdBody) return false;
         
@@ -148,7 +148,7 @@ bool Reaction::operator==(const Reaction& r) const {
         if (coeffs[nm] == 0.0) return false;
         coeffs[nm] /= products[jp].number;
     }
-    int nc = coeffs.size();
+    int nc = static_cast<int>(coeffs.size());
     vector<double> ratios;
     getMapValues(coeffs, ratios);
     
diff --git a/Cantera/src/converters/ckr_utils.cpp b/Cantera/src/converters/ckr_utils.cpp
index d89bb508c..03f0b3487 100755
--- a/Cantera/src/converters/ckr_utils.cpp
+++ b/Cantera/src/converters/ckr_utils.cpp
@@ -32,7 +32,7 @@ bool match(const string& s1, const string& s2)
 /// remove all white space from string s.
 void removeWhiteSpace(string& s) {
     string r;
-    int ssize = s.size();
+    int ssize = static_cast<int>(s.size());
     for (int n = 0; n < ssize; n++) if (s[n] != ' ' 
         && s[n] != '\t' && s[n] != '\n') r += s[n];
     s = r;
@@ -76,7 +76,7 @@ void getTokens(string& s, int n, vector<string>& toks, char delim) {
     }
 
     toks.clear();
-    int nt = tokk.size();
+    int nt = static_cast<int>(tokk.size());
     string t = "";
     for (int i = 0; i < nt; i++) {
         if (tokk[i][0] == '/') t += tokk[i];
@@ -97,25 +97,25 @@ void getTokens(string& s, int n, vector<string>& toks, char delim) {
  * false otherwise.
  */
 bool extractSlashData(string& s, string& name, string& data) {
-    int slen = s.size();
-    int n = s.find_first_of("/");
-    if (n >= 0 &&  n < slen) {
-	int m;
-        for (m = n+1; m < slen; m++) if (s[m] == '/') break;
-	if (m < slen) {
+    int slen = static_cast<int>(s.size());
+	string::size_type n = s.find_first_of("/");
+	if (n != string::npos && (static_cast<int>(n) < slen)) {
+	  int m;
+      for (m = static_cast<int>(n)+1; m < slen; m++) if (s[m] == '/') break;
+	  if (m < slen) {
 	    data = s.substr(n+1,m-n-1);
 	    name = s.substr(0,n);
 	    removeWhiteSpace(name);
 	    s = s.substr(m+1,1000);
 	    return true;
-	}
-	else {
+	  }
+	  else {
 	    name = s;
 	    removeWhiteSpace(name);
 	    data = "";
 	    s = "";
 	    return false;
-	}
+	  }
     }
     else {
 	name = s;
@@ -133,7 +133,7 @@ bool extractSlashData(string& s, string& name, string& data) {
  */
 string capitalize(const string& word) {
     string cap = word;
-    int n = word.size();
+    int n = static_cast<int>(word.size());
     if (n > 0) {
         cap[0] = toupper(word[0]);
         for (int m = 1; m < n; m++) {
diff --git a/Cantera/src/converters/filter.cpp b/Cantera/src/converters/filter.cpp
index 8603400d8..eab97b2da 100755
--- a/Cantera/src/converters/filter.cpp
+++ b/Cantera/src/converters/filter.cpp
@@ -67,7 +67,7 @@ namespace ckr {
             cerr << "could not open " << outfile << endl;
             return false;
         }
-        int nel = ck.elements.size();
+        int nel = static_cast<int>(ck.elements.size());
         int n;
 
         // write header information
@@ -83,7 +83,7 @@ namespace ckr {
         for (n = 0; n < nel; n++) fout << ck.elements[n];
         fout << "END" << endl;
 
-        int nsp = species.size();
+        int nsp = static_cast<int>(species.size());
         fout << "SPECIES" << endl;
         for (n = 0; n < nsp; n++) {
             fout << ck.species[ species[n] ].name << " ";
@@ -91,10 +91,10 @@ namespace ckr {
         }
         fout << "END" << endl;
         fout << "REACTIONS" << endl;
-        int nrxns = reactions.size();
+        int nrxns = static_cast<int>(reactions.size());
         for (n = 0; n < nrxns; n++) {
             vector<string>& lines = ck.reactions[reactions[n]].lines;
-            int nl = lines.size();
+            int nl = static_cast<int>(lines.size());
             for (int j = 0; j < nl; j++) fout << lines[j] << endl;
         }
         fout.close();
diff --git a/Cantera/src/converters/writelog.cpp b/Cantera/src/converters/writelog.cpp
index 73064523b..cf7dded5a 100755
--- a/Cantera/src/converters/writelog.cpp
+++ b/Cantera/src/converters/writelog.cpp
@@ -50,7 +50,9 @@ namespace ckr {
                     << ", " << c[2] << ", " << c[3] << ")" << endl;
             }
             else {
-                for (size_t n = 0; n < c.size(); n++) log << c[n] << ", "; log << endl;
+				for (ct::ctvector_fp::size_t n = 0; n < c.size(); n++) {
+					log << c[n] << ", "; log << endl;
+				}
                 log << "###### ERROR #####   incorrect number of parameters" << endl;
                 return false;
             }
@@ -68,7 +70,9 @@ namespace ckr {
                     << ")" << endl;
             }
             else {
-                for (size_t n = 0; n < c.size(); n++) log << c[n] << ", "; log << endl;
+				for (ct::ctvector_fp::size_t n = 0; n < c.size(); n++) {
+					log << c[n] << ", "; log << endl;
+				}
                 log << "##### ERROR #####  incorrect number of parameters" << endl;
                 return false;
             }
@@ -150,8 +154,8 @@ namespace ckr {
      */
     string reactionEquation(const Reaction& r) {
         string s = "";
-        int nr = r.reactants.size();
-        int np = r.products.size();
+        int nr = static_cast<int>(r.reactants.size());
+        int np = static_cast<int>(r.products.size());
         int k;
         double m;
         char buf[20];