A quick Python script to compute Stripe fees, for invoicing customers

calculate-stripe-fee.py

"""
    A simple Python3 script to take in a project price, and output the fee Stripe will charge on an invoice.

    See also:
    https://support.stripe.com/questions/passing-the-stripe-fee-on-to-customers

    USAGE - Call the script with Python3 and its path, and give your project/goal price as an arg:

    python3 calculate-stripe-fee.py 95.00

    (Leave out the "$" sign from your project price)

    You could alternatively call this file as a function from within a .bashprofile or similar:

    stripe () {
       python3 <PATH_TO_WHEREVER_YOU_STORE_THIS_FILE>/calculate-stripe-fee.py $1
    }

    ...and then have a little command line tool available like the following:

    ▶ stripe 95

    Assuming a Stripe fee of 0.029% + $0.3...

    Your goal:             $95.00
    Stripe fee:             $3.15
    Total to charge:       $98.15
"""

import sys

# stripe fee (https://stripe.com/pricing)
flatFee = 0.30
percentageFee = 0.029

# check if the user has included a project price, exit if not
if len(sys.argv) == 1:
  print()
  print("⚠️ You must include your project price / goal price")
  exit()

# gets the input of the goal pricing
projectPrice = sys.argv[1]

def calculateStripeCharge(goal, flatFee=0.30, percentageFee=0.029):
  """
    Simple function to determine Stripe fee, and return info as formatted currency strings.
  """
  
  goal = float(goal)
  total = round((goal + flatFee) / (1 - percentageFee), 2)
  fee = round(total - goal, 2)

  return(f"${goal:.2f}", f"${total:.2f}", f"${fee:.2f}")


pricing = calculateStripeCharge(projectPrice, flatFee=flatFee, percentageFee=percentageFee)

print()
print(f"Assuming a Stripe fee of {percentageFee}% + ${flatFee:.2f}...")
print()
print(f"Your goal:       {pricing[0].rjust(12)}")
print(f"Stripe fee:      {pricing[2].rjust(12)}")
print(f"Total to charge: {pricing[1].rjust(12)}")
print()