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Python Program to Print a Temperature Conversion Table

Beginner · Basics

This program prints a table of temperatures in Celsius next to the same temperatures in Fahrenheit, from 0 to 100 degrees in steps of 10. The formula is F = C x 9/5 + 32, so water freezes at 32 F and boils at 212 F.

Program

temperature_table.py
start = 0 # or: start = int(input("Start (Celsius): "))
end = 100 # or: end = int(input("End (Celsius): "))
step = 10
print("Celsius Fahrenheit")
print("------- ----------")
for celsius in range(start, end + 1, step):
fahrenheit = celsius * 9 / 5 + 32
print(f"{celsius:>7} {fahrenheit:>10.1f}")
Output
Celsius   Fahrenheit
-------   ----------
      0         32.0
     10         50.0
     20         68.0
     30         86.0
     40        104.0
     50        122.0
     60        140.0
     70        158.0
     80        176.0
     90        194.0
    100        212.0

How it works

  1. range(start, end + 1, step) gives 0, 10, 20 and so on up to 100, with + 1 so the end value is included.
  2. Each Celsius value is converted with celsius * 9 / 5 + 32.
  3. In the f-string, :>7 right-aligns a value in a space 7 characters wide, so the numbers line up under their headings.
  4. .1f shows the Fahrenheit value with one decimal place, which matters for steps that do not give whole numbers, such as 5 degrees.

Other ways to write it

Fahrenheit to Celsius with a while loop

Fahrenheit to Celsius with a while loop
fahrenheit = 32
print("Fahrenheit Celsius")
while fahrenheit <= 212:
celsius = (fahrenheit - 32) * 5 / 9
print(f"{fahrenheit:>10} {celsius:>7.1f}")
fahrenheit += 20
Output
Fahrenheit   Celsius
        32       0.0
        52      11.1
        72      22.2
        92      33.3
       112      44.4
       132      55.6
       152      66.7
       172      77.8
       192      88.9
       212     100.0

The while loop adds 20 each time until it passes 212, and the formula is turned around to C = (F - 32) x 5/9.

Adding a Kelvin column

Adding a Kelvin column
def to_fahrenheit(c):
return c * 9 / 5 + 32
print(" C F K")
for c in range(-40, 41, 20):
print(f"{c:>6} {to_fahrenheit(c):>7.1f} {c + 273.15:>8.2f}")
Output
     C       F        K
   -40   -40.0   233.15
   -20    -4.0   253.15
     0    32.0   273.15
    20    68.0   293.15
    40   104.0   313.15

At -40 degrees the Celsius and Fahrenheit scales meet, and Kelvin is simply Celsius plus 273.15.

Try it yourself

Change the table to run from -20 to 50 degrees Celsius in steps of 5.

Edit the program above and press Run, or open it in the full editor to save it and share it. To watch it run line by line, open it in the visualizer.

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