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Excel 数字与取整函数:四舍五入、去尾、凑整、随机数

  • 2026-11-07 16:50:28
Excel 数字与取整函数:四舍五入、去尾、凑整、随机数

Excel 数字与取整函数:四舍五入、去尾、凑整、随机数

财务对账要四舍五入到分,报预算要往上取整留余量,算年龄只想砍掉小数,抽个随机数做抽样——这些需求背后都是"怎么处理一个带小数的数字"。Excel 提供了好几个长得很像、规则却不同的函数,选对了省心,选错了排查半天。

括号、逗号全用英文符号,函数名不区分大小写,round 和 ROUND 效果一样。

四舍五入这一族

ROUND 标准四舍五入

语法 =ROUND(数字, 保留几位小数)。第二个参数是正数保留小数,是 0 抹到个位,是负数往十位百位方向凑。

• A2 是 68.57:=ROUND(A2,1) 得 68.6,=ROUND(A2,0) 得 69,=ROUND(A2,-1) 得 70(凑到最近的十位)。

ROUNDUP 一律向上进位

语法 =ROUNDUP(数字, 保留几位小数),不管第三位是几都往前进一。

• A2 是 62.52,=ROUNDUP(A2,1) 得 62.6。报价留余量、按次计费不足一次按一次算常用它。

ROUNDDOWN 一律向下舍去

语法 =ROUNDDOWN(数字, 保留几位小数),直接砍掉不要的部分,不进位。

• A2 是 62.59,=ROUNDDOWN(A2,1) 得 62.5。

三个函数用同一份数 62.52 对比更直观:ROUND 得 62.5、ROUNDUP 得 62.6、ROUNDDOWN 得 62.5。ROUND 讲规矩,UPPER 永远进、DOWN 永远舍。

ABS 取绝对值

语法 =ABS(数字),去掉负号。

• A2 是 -62.34,=ABS(A2) 得 62.34。算误差、算差额只看大小不看正负时用它。

只砍小数和凑奇偶

INT 向下取整到整数

语法 =INT(数字),朝小于等于它的整数方向取。

• A2 是 5.99,=INT(A2) 得 5。

• 注意负数:=INT(-5.99) 得 -6,不是 -5,因为 -6 才是比 -5.99 更小的整数。

TRUNC 直接截掉小数

语法 =TRUNC(数字, [保留几位]),把小数部分砍掉,不看方向。

• A2 是 5.679,=TRUNC(A2) 得 5。

• 负数上差别就出来了:=TRUNC(-5.9) 得 -5,比 INT 的 -6 大 1。正数时两者一样,涉及负数要认准用哪个。

EVEN 与 ODD 凑偶数、凑奇数

语法 =EVEN(数字) / =ODD(数字),朝远离零的方向凑到最近的偶数或奇数。

•=EVEN(62.54) 得 64,=EVEN(-62.54) 得 -64。

•=ODD(62.54) 得 63,=ODD(-62.54) 得 -63。

• 排兵布阵、双列布局要凑成对时用 EVEN 很顺手。

乘方、连乘和取余

POWER 与 ^ 算乘方

两种写法等价,^ 是运算符、POWER 是函数。

•=POWER(4,3) 得 64(4 的 3 次方),=4^3 同样得 64。

• 开平方就是乘二分之一次方:=POWER(4,1/2) 得 2,或 =4^(1/2)。

• 平方 =A2^2,立方 =A2^3,直接写运算符更快。

PRODUCT 连乘

语法 =PRODUCT(数字1, 数字2, …) 或 =PRODUCT(区域),返回所有数相乘的积。

•=PRODUCT(1,2,3,4) 得 24。

• A2:C3 是一片数据,=PRODUCT(A2:C3) 把区域内所有数连乘。

MOD 取余数

语法 =MOD(被除数, 除数),返回相除后的余数。

•=MOD(10,3) 得 1。

• 判断奇偶:=MOD(A2,2) 是 0 就是偶数、是 1 就是奇数。

• 实战套路,身份证第 17 位判男女:=IF(MOD(MID(A2,17,1),2)=0,"女","男")。

随机数两兄弟

RAND 返回 0 到 1 的小数

语法 =RAND(),不带参数。每次表格重算都会变。

• 想要 1 到 100 的随机小数:=ROUND(RAND()*100,2)。

RANDBETWEEN 返回指定区间的随机整数

语法 =RANDBETWEEN(最小, 最大),含两端。

•=RANDBETWEEN(50,100) 随机出一个 50 到 100 的整数,给抽奖、随机分组、造测试数据很直接。

• 想要带一位小数的随机数:=RANDBETWEEN(10,100)/10,得到 1.0 到 10.0。

RAND 和 RANDBETWEEN 都是"活的",一点别的地方数据就跟着跳。想把这个随机结果定死,选中单元格按 Ctrl+C,再右键"选择性粘贴 → 数值",随机数就固定不再变了。

一张表对照这 14 个

函数
干什么
例子
结果
ABS
取绝对值
=ABS(-62.34)
62.34
ROUND
四舍五入
=ROUND(68.57,0)
69
ROUNDUP
向上进位
=ROUNDUP(62.52,1)
62.6
ROUNDDOWN
向下舍去
=ROUNDDOWN(62.59,1)
62.5
EVEN
凑最近偶数
=EVEN(62.54)
64
ODD
凑最近奇数
=ODD(62.54)
63
INT
向下取整
=INT(5.99)
5
TRUNC
截掉小数
=TRUNC(5.679)
5
POWER
乘方
=POWER(4,3)
64
^
乘方(运算符)
=4^3
64
PRODUCT
连乘
=PRODUCT(1,2,3,4)
24
MOD
取余数
=MOD(10,3)
1
RAND
0-1 随机小数
=RAND()
0.xxxx
RANDBETWEEN
区间随机整数
=RANDBETWEEN(50,100)
50-100

最容易搞混的两处

疑惑
讲清楚
INT 和 TRUNC 差在哪
正数一样,负数不同:INT 往小取(-5.9→-6),TRUNC 直接砍小数(-5.9→-5)
ROUND 和 ROUNDDOWN 差在哪
62.57 保 1 位,ROUND 看第 2 位决定进不进(得 62.6),ROUNDDOWN 永远不进(得 62.5)


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  138. /www/wwwroot/h.sjds.net/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /www/wwwroot/h.sjds.net/runtime/temp/c1d6e8c94b2c2fa10e259903674c804d.php ( 8.11 KB )
  140. /www/wwwroot/h.sjds.net/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000827s ] mysql:host=172.18.0.4;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001237s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000560s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000480s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000728s ]
  6. SELECT * FROM `set` [ RunTime:0.000359s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000930s ]
  8. SELECT * FROM `article` WHERE `id` = 567475 LIMIT 1 [ RunTime:0.000547s ]
  9. UPDATE `article` SET `lasttime` = 1794181478 WHERE `id` = 567475 [ RunTime:0.001973s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000436s ]
  11. SELECT * FROM `article` WHERE `id` < 567475 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000559s ]
  12. SELECT * FROM `article` WHERE `id` > 567475 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000487s ]
  13. SELECT * FROM `article` WHERE `id` < 567475 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000710s ]
  14. SELECT * FROM `article` WHERE `id` < 567475 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000629s ]
  15. SELECT * FROM `article` WHERE `id` < 567475 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000716s ]
0.114960s