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I need to display a file size as a string using sensible units. For example, 1L ==> "1 B"; 1024L ==> "1 KB"; 2537253L ==> "2.3 MB" etc. I found this previous answer , which I didn't find satisfactory. I have come up with my own solution which has similar shortcomings: 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 String.format("%.1f %s", Double.valueOf(result), unit); } The main problem is my limited knowledge of Decimalformat and / or String.format. I would like 1024L, 1025L, etc. to map to 1 KB rather than 1.0 KB . So, two possibilities: I would prefer a good out-of-the-box solution in a public library like Apache Commons or Google

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