All Fermi answers
Fermi #108 · Question 1

How many times is a Visa card used every second?

Explore the official answer and the simple reasoning behind this Fermi estimate.

1QUESTION 1 OF 3

Answer & explanation

Averaged across Visa's 2026 fiscal year, counting purchases and cash withdrawals.

The official answer, with Fermi’s reasoning step by step.

Answer & explanation

Official answer

11,300

times

How to estimate it

Fermi’s official “Napkin math”

Visa is the biggest card company, so start with its cardholders. Call it 200 million people. How often does each one use a card in a day? Maybe 5 times, which makes about a billion a day.

People with a Visa
≈ 200,000,000
Uses each a day
× 5
Uses a day
≈ 1,000,000,000
1B ÷ 86,400 seconds a day
≈ 11,500

Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.

Source calculation & reference
Payments transactions
339.5 billion
Cash transactions
+ 15.6 billion
Total, fiscal 2026
355.1 billion
÷ 31,536,000 seconds a year
≈ 11,300

Reference cited by Fermi: Visa operational data, fiscal 2026: 355 billion payments and cash transactions

How close was your guess?

Your comparison will appear here.

Compare by ratio: divide the larger number by the smaller one. The closer to 1×, the better.

Skip to main content