/*
 * This file is part of AlmuraSDK, licensed under the MIT License (MIT).
 *
 * Copyright (c) AlmuraDev <http://github.com/AlmuraDev/AlmuraSDK/>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.almuradev.almurasdk.util;

public class FileSizeUtil {

    private static final String[] SIZE_SUFFIXES = { "B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };

    public static String format(long value) {
        if (value < 0) return "-" + format(-value);
        if (value == 0) return "0B";

        final int mag = (int) (Math.log10(value) / Math.log10(1000));
        final float adjustedSize = (float) value / (1L << (mag * 10));

        final String format = (mag > 2 ? "%.2f" : "%.0f") + "%s";
        return String.format(format, adjustedSize, SIZE_SUFFIXES[mag]);
    }
}

/*
 * This file is part of AlmuraSDK, licensed under the MIT License (MIT).
 *
 * Copyright (c) AlmuraDev <http://github.com/AlmuraDev/AlmuraSDK/>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.almuradev.almurasdk.util;

public class FileSizeUtil {

    private static final String[] SIZE_SUFFIXES = { "B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };

    public static String format(long value) {
        if (value < 0) return "-" + format(-value);
        if (value == 0) return "0B";

        final int mag = (int) (Math.log10(value) / Math.log10(1024));
        final float adjustedSize = (float) value / (1L << (mag * 10));

        final String format = (mag > 2 ? "%.2f" : "%.0f") + "%s";
        return String.format(format, adjustedSize, SIZE_SUFFIXES[mag]);
    }
}

Use base 2 instead of base 10