Calculator for Converting a Long Number From One Base to Another

Take this input number:

Convert From Base: base 2base 3base 4base 5base 6base 7base 8base 9base 10base 11base 12base 13base 14base 15base 16base 17base 18base 19base 20base 21base 22base 23base 24base 25base 26base 27base 28base 29base 30base 31base 32base 33base 34base 35base 36base 37base 38base 39base 40base 41base 42base 43base 44base 45base 46base 47base 48base 49base 50base 51base 52base 53base 54base 55base 56base 57base 58base 59base 60base 61base 62

Convert To Base: base 2base 3base 4base 5base 6base 7base 8base 9base 10base 11base 12base 13base 14base 15base 16base 17base 18base 19base 20base 21base 22base 23base 24base 25base 26base 27base 28base 29base 30base 31base 32base 33base 34base 35base 36base 37base 38base 39base 40base 41base 42base 43base 44base 45base 46base 47base 48base 49base 50base 51base 52base 53base 54base 55base 56base 57base 58base 59base 60base 61base 62

The software will remove all spaces from the text box. Note: This web page now supports number bases up to 62. Bases from 11 to 36 use case-insensitive letters A thru Z for digits greater than 9. Bases from 37 to 62 use uppercase letters for digits from 10 to 35 and lowercase letters for digits from 36 to 61. A negative number should be identified by one hyphen in front of the number. Maximum level of accuracy varies from a low of about 300 digits for base 62 to about 1900 digits for base 2. Integers will either be converted accurately, or an error message will be returned. If a fraction (designated by a period in the proper position) is entered, significant round-off error can occur for numbers with total digits outside of the supported range. If you want to convert a very long number which has both a long integer part and a long fractional part, I suggest you do so in two steps: once for the integer part and once for the fractional part.

This page is dedicated to all software engineers who cannot fathom the concept of hexadecimal fractions, binary fractions, or octal fractions.

For those wishing to automate queries to this page, use the following format to return the value of "x" converted from base "basein" to base "baseout" where x equals 123.456 and basein equals 10 and baseout equals 8 (for example):

http://www.markknowsnothing.com/cgi-bin/baseconv.cgi?x=123.456&basein=10&baseout=8

Only one such request will be honored in any two-minute period.