This is a documentation subpage for Template:Round. It may contain usage information, categories and other content that is not part of the original template page.

This template is used on approximately 61,000 pages and changes may be widely noticed. Test changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Consider discussing changes on the talk page before implementing them.

This template uses Lua: Module:Math (sandbox)

This template rounds parameter 1 by parameter 2 decimal places (goes the other way for negative rounding) and includes trailing zeros.

• {{Round|54.376|2}} → 54.38
• {{Round|54.376|-1}} → 50
• {{Round|68.4273E12|-10}} → 6.843×10¹³

For example, rounding by 1 gives 1 decimal digit, rounding by 0 gives integers, or rounding by -2 gives the amount in hundreds. Scientific notation is displayed for numbers greater than or equal to 1×10⁹, or less than 1×10⁻⁴.

• {{Round|2.0004|3}} → 2.000
  • {{expr:2.0004 round 3}} → 2
• {{Round|0.000020004|7}} → 000
• {{Round|0|8}} → 0.00000000
• {{Round|154268|-3}} → 154,000
• {{Round|154568|-3}} → 155,000
• {{Round|1200004|-1}} → 1,200,000
  • whereas {{expr:1200004round-1}} → 1200000, even though {{expr:1300004round-1}} → 1300000 (see m:Help:Format produced by expr)
• {{Round|1300004|-1}} → 1,300,000
• {{Round|4.1e6|9}} → 4,100,000.000000000
• {{Round|4.1e6|10}} → 4,100,000.0000000000
• {{Round|1542689271|-7}} → 1.54×10⁹
• {{Round|1542689271|2}} → 1.54268927100×10⁹
• {{Round|7e9|-9}} → 7×10⁹
• {{Round|-123|1}} → −123.0
• {{Round|-1200007|-2}} → −1,200,000
• {{Round|-1234567899|-7}} → −1.23×10⁹

As with #expr, the total number of significant digits is not more than 14:

• {{Round|1234567890.123456789|10}} → 1.2345678901235×10⁹
• {{Round|123456789.0123456789|10}} → 123,456,789.01235
• {{Round|.0001234567890123456789|20}} → 0.00012345678901235

The second parameter, precision, should be an integer. Non-integer may give unexpected result.

• {{Round|1.234567}} → 1
• {{Round|1.234567|2}} → 1.23
• {{Round|1.234567|2.3}} → 1.2329205947231
• {{Round|1.234567|2.7}} → 1.2350673729657

Non-numeric input will result in an error message.

• {{Round|invalid}} → Formatting error: invalid input when rounding

• Category:Pages with bad rounding precision (14)

• {{Rounded calculation}}
• {{Significant figures}}
• {{Roundup}}
• {{Rounddown}}