How to Convert an Integer to a Float Number in Go

Created May 3, 2022 at 9:25

Modified May 3, 2022 at 10:48

Using float64 Function

The easiest way to convert an integer to a float number in Golang:

package main

import "fmt"

func main() {
  i := 6

  f := float64(i)
  fmt.Printf("%T: %f\n", f, f)
  fmt.Printf("%T: %.3f\n", f, f)

  f32 := float32(i)
  fmt.Printf("%T: %f\n", f32, f32)
}

float64: 6.000000
float64: 6.000
float32: 6.000000

Proper parentheses placement is key:

For example,

package main

import "fmt"

func main() {
  i := 1234

  f := float64(i) / 10.0
  fmt.Printf("%T: %f\n", f, f)

  // wrong
  f = float64(i / 10.0)
  fmt.Printf("%T: %f\n", f, f)
}