diff --git a/src/components/Response/Redirect.js b/src/components/Response/Redirect.js
index f97abdf..0176c6f 100644
--- a/src/components/Response/Redirect.js
+++ b/src/components/Response/Redirect.js
@@ -4,13 +4,16 @@ import responsePropTypes, { redirectShape } from 'propTypes/redirect';
 import { StyledResponse, StyledHeader } from './StyledComponents';
 import Headers from './Headers';
 import StatusChip from './StatusChip';
+import SizeBytes from './SizeBytes';
 
-function Titlebar({ url, time, statusCode, onClick }) {
+function Titlebar({ url, time, size, statusCode, onClick }) {
   return (
     <StyledHeader expandable onClick={onClick}>
       <h3>
         <StatusChip statusCode={statusCode} />
-        Redirect ({(time / 1000).toFixed(3)}s)
+        <span>Redirect</span>
+        <SizeBytes size={size} />
+        <span>({(time / 1000).toFixed(3)}s)</span>
         <a href={url} className="text-muted">{url}</a>
       </h3>
     </StyledHeader>
@@ -20,6 +23,7 @@ function Titlebar({ url, time, statusCode, onClick }) {
 Titlebar.propTypes = {
   url: redirectShape.url,
   time: redirectShape.time,
+  size: PropTypes.number.isRequired,
   statusCode: PropTypes.number.isRequired,
   onClick: PropTypes.func.isRequired,
 };
@@ -36,6 +40,9 @@ function Redirect(props) {
 
   const { method, url, time, statusCode } = response;
 
+  const contentLength = headers.find(header => (header.name.toLowerCase() === 'content-length'));
+  const contentSize = contentLength ? Number(contentLength.value) : 0;
+
   return (
     <StyledResponse
       collapsible
@@ -45,6 +52,7 @@ function Redirect(props) {
           method={method}
           statusCode={statusCode}
           url={url}
+          size={contentSize}
           time={time}
           onClick={setExpanded}
         />
diff --git a/src/components/Response/Response.js b/src/components/Response/Response.js
index c088e7e..1161524 100644
--- a/src/components/Response/Response.js
+++ b/src/components/Response/Response.js
@@ -14,13 +14,16 @@ import { StyledResponse, StyledHeader } from './StyledComponents';
 import Headers from './Headers';
 import RenderedResponse from './RenderedResponse';
 import StatusChip from './StatusChip';
+import SizeBytes from './SizeBytes';
 
-function Titlebar({ url, time, statusCode }) {
+function Titlebar({ url, time, size, statusCode }) {
   return (
     <StyledHeader>
       <h3>
         <StatusChip statusCode={statusCode} />
-        Response ({time})
+        <span>Response</span>
+        <SizeBytes size={size} />
+        <span>({time})</span>
         <a href={url} className="text-muted">{url}</a>
       </h3>
     </StyledHeader>
@@ -30,6 +33,7 @@ function Titlebar({ url, time, statusCode }) {
 Titlebar.propTypes = {
   url: responseShape.url,
   time: PropTypes.node.isRequired,
+  size: PropTypes.number.isRequired,
   statusCode: PropTypes.number.isRequired,
 };
 
@@ -82,7 +86,15 @@ export function Response(props) {
   return (
     <StyledResponse
       wrapResponse={wrapResponse}
-      header={<Titlebar statusCode={status} method={method} url={url} time={time} />}
+      header={(
+        <Titlebar
+          statusCode={status}
+          method={method}
+          url={url}
+          size={contentSize}
+          time={time}
+        />
+      )}
     >
       <Headers headers={interceptedResponse.responseHeaders} />
       {type.html && <RenderedResponse html={body} />}
diff --git a/src/components/Response/SizeBytes.js b/src/components/Response/SizeBytes.js
new file mode 100644
index 0000000..cbe9ae6
--- /dev/null
+++ b/src/components/Response/SizeBytes.js
@@ -0,0 +1,17 @@
+import React, { PropTypes } from 'react';
+
+import byteFormatter from 'utils/byteFormatter';
+
+function SizeBytes({ size }) {
+  return (
+    <span title={`${size} bytes`}>
+      {byteFormatter(size)}
+    </span>
+  );
+}
+
+SizeBytes.propTypes = {
+  size: PropTypes.number.isRequired,
+};
+
+export default SizeBytes;
diff --git a/src/utils/byteFormatter.js b/src/utils/byteFormatter.js
new file mode 100644
index 0000000..5a2a2ff
--- /dev/null
+++ b/src/utils/byteFormatter.js
@@ -0,0 +1,14 @@
+const KB = 1024;
+const MB = 1024 * KB;
+const GB = 1024 * MB;
+
+/*
+ * Formats the provided number in bytes as a string of bytes,
+ * KB, MB, or GB, with one decimal point and the unit suffix.
+ */
+export default function byteFormatter(bytes) {
+  if (bytes < 100) return `${bytes} bytes`;
+  if (bytes > GB) return `${(bytes / GB).toFixed(1)} GB`;
+  if (bytes > MB) return `${(bytes / MB).toFixed(1)} MB`;
+  return `${(bytes / KB).toFixed(1)} KB`;
+}
diff --git a/test/components/response/__snapshots__/response.test.js.snap b/test/components/response/__snapshots__/response.test.js.snap
index 0a493d6..bd57393 100644
--- a/test/components/response/__snapshots__/response.test.js.snap
+++ b/test/components/response/__snapshots__/response.test.js.snap
@@ -17,9 +17,19 @@ exports[`response component renders a result when given one 1`] = `
         >
           200
         </span>
-        Response (
-        0.123s
-        )
+        <span>
+          Response
+        </span>
+        <span
+          title="14 bytes"
+        >
+          14 bytes
+        </span>
+        <span>
+          (
+          0.123s
+          )
+        </span>
         <a
           className="text-muted"
           href="http://example.com"