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NumberFormat—Wolfram Documentation

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NumberFormat

is an option for NumberForm and related functions that specifies how the mantissa, base, and exponent should be assembled into a final print form.

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Examples  
Basic Examples  
Scope  
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NumberFormat

NumberFormat

is an option for NumberForm and related functions that specifies how the mantissa, base, and exponent should be assembled into a final print form.

Details

  • With the setting NumberFormat->f, the function f is supplied with three arguments: the mantissa, base and exponent of each number to be printed. »
  • The arguments are all given as strings. »
  • When no exponent is to be printed, the third argument is given as "". »
  • The function f must return the final format for the number.

Examples

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Basic Examples  (1)

Display numbers in a Fortran‐like form:

Wolfram Language code: v = {8. ^ 5, 11. ^ 7, 13. ^ 9}
Wolfram Language code: NumberForm[v, NumberFormat -> (Row[{#1, "e", #3}]&)]

Display only the mantissas:

Wolfram Language code: NumberForm[v, NumberFormat -> (#1&)]

Display the exponents after converting to scientific form:

Wolfram Language code: NumberForm[v, NumberFormat -> (#3&), ExponentFunction -> (#&)]

Scope  (3)

Use NumberFormat with PaddedForm:

Wolfram Language code: p = N[E ^ Range[5, 20, 5]]
Wolfram Language code: PaddedForm[p, 10, NumberFormat -> (Row[{#1, "e", #3}]&)]

EngineeringForm:

Wolfram Language code: EngineeringForm[p, 10, NumberFormat -> (Row[{#1, "e", #3}]&)]

ScientificForm:

Wolfram Language code: ScientificForm[p, 10, NumberFormat -> (Row[{#1, "e", #3}]&)]

AccountingForm:

Wolfram Language code: AccountingForm[p, 10, NumberFormat -> (Row[{#1, "e", #3}]&)]

Display numbers as lists containing the mantissa, base, and exponent:

Wolfram Language code: NumberForm[{8. ^ 5, 11. ^ 7, 13. ^ 9}, NumberFormat -> ({#1, #2, #3}&)]

Do the same for ScientificForm:

Wolfram Language code: ScientificForm[{8. ^ 5, 11. ^ 7, 13. ^ 9}, NumberFormat -> ({#1, #2, #3}&)]

The arguments are strings:

Wolfram Language code: NumberForm[1234567.89, NumberFormat -> (FullForm[{#1, #2, #3}]&)]

If there is no exponent, the third argument is an empty string:

Wolfram Language code: NumberForm[123.456, NumberFormat -> (FullForm[{#1, #2, #3}]&)]
Wolfram Research (1991), NumberFormat, Wolfram Language function, https://reference.wolfram.com/language/ref/NumberFormat.html.

Text

Wolfram Research (1991), NumberFormat, Wolfram Language function, https://reference.wolfram.com/language/ref/NumberFormat.html.

CMS

Wolfram Language. 1991. "NumberFormat." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/NumberFormat.html.

APA

Wolfram Language. (1991). NumberFormat. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/NumberFormat.html

BibTeX

@misc{reference.wolfram_2026_numberformat, author="Wolfram Research", title="{NumberFormat}", year="1991", howpublished="\url{https://reference.wolfram.com/language/ref/NumberFormat.html}", note=[Accessed: 14-November-2026]}

BibLaTeX

@online{reference.wolfram_2026_numberformat, organization={Wolfram Research}, title={NumberFormat}, year={1991}, url={https://reference.wolfram.com/language/ref/NumberFormat.html}, note=[Accessed: 14-November-2026]}