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copied!<p>I asked the same Question recently:</p> <p><a href="https://stackoverflow.com/questions/3263892/format-file-size-as-mb-gb-etc">Format file size as MB, GB etc</a></p> <p>While there is no out-of-the-box answer, I can live with the solution:</p> <pre><code>private static final long K = 1024; private static final long M = K * K; private static final long G = M * K; private static final long T = G * K; public static String convertToStringRepresentation(final long value){ final long[] dividers = new long[] { T, G, M, K, 1 }; final String[] units = new String[] { "TB", "GB", "MB", "KB", "B" }; if(value < 1) throw new IllegalArgumentException("Invalid file size: " + value); String result = null; for(int i = 0; i < dividers.length; i++){ final long divider = dividers[i]; if(value >= divider){ result = format(value, divider, units[i]); break; } } return result; } private static String format(final long value, final long divider, final String unit){ final double result = divider > 1 ? (double) value / (double) divider : (double) value; return new DecimalFormat("#,##0.#").format(result) + " " + unit; } </code></pre> <p>Test code:</p> <pre><code>public static void main(final String[] args){ final long[] l = new long[] { 1l, 4343l, 43434334l, 3563543743l }; for(final long ll : l){ System.out.println(convertToStringRepresentation(ll)); } } </code></pre> <p>Output (on my German Locale):</p> <pre><code>1 B 4,2 KB 41,4 MB 3,3 GB </code></pre> <hr> <p>Edit: I have opened an <a href="http://code.google.com/p/guava-libraries/issues/detail?id=428" rel="nofollow noreferrer">Issue requesting this functionality for Google Guava</a>. Perhaps someone would care to support it.</p>

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