# Exact Number Base Converter

Convert signed integer strings across bases 2 to 36 without float rounding.

[Open this tool](https://whatson.pk/developer-number-base-calculator/)

Category: Developer & Data

A long integer can lose precision if converted through floating point arithmetic.

Enter a signed whole number string and choose bases from 2 through 36.

## Inputs and controls

* Input integer
* Input base (base). Allowed range: 2 to 36
* Output base (base). Allowed range: 2 to 36

## How to use

* Enter input integer.

* Enter input base and output base.

* Select Process input. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.


## Why use this tool

String based conversion keeps large integer representations exact on the supported basis.


## Before relying on the result

Maximum 128 digits plus an optional sign. Fractions and exponential notation are not supported. Letter digits are case insensitive.


## Tool limitations

Maximum 128 digits plus an optional sign. Fractions and exponential notation are not supported. Letter digits are case insensitive.

## Questions

### Are fractions or exponential notation supported?

No. Use whole number digit strings with an optional sign, up to the stated length limit.

### What should I check before using Exact Number Base Converter?

Check Input integer, Input base and Output base. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-04T16:58:29+00:00

This profile describes the tool. It does not execute it or supply a professional certification.