On this page
How to Check Password Strength
Formula
Strength is measured by entropy: bits of randomness. Higher entropy means harder to crack.
A 12-character mixed password has about 74 bits, taking billions of years to brute-force.
Common use cases:
- Check if your password is strong
- Compare password policies by entropy
- Understand password security math
Frequently Asked Questions
Maria Gonzalez
Registered Dietitian, RD, MPH
Maria is a Registered Dietitian with a Master's in Public Health. She focuses on evidence-based nutrition assessment tools including BMI, calorie calculations, and body composition analysis.
Was this calculator helpful?
People Also Use
Fuel Cost
Calculate your trip fuel costs with our free gas cost estimator. Enter distance, fuel efficiency, and gas price to see total cost and fuel needed.
Age Calculator
Calculate your exact age in years, months, days, and weeks from your date of birth using our free age calculator.
Final Grade
Find out what score you need on your final exam to reach your desired course grade with our free calculator.
Test Grade
Calculate your test score percentage and letter grade instantly by entering questions correct and total questions.
Gas Calculator
Estimate how many gallons of gas you need and the total fuel cost for any trip based on distance and MPG.
MPG Calculator
Calculate your vehicle's fuel efficiency in miles per gallon by entering miles driven and gallons used.
Speed Calculator
Calculate speed, distance, or travel time using the speed-distance-time formula with our free calculator.
Drive Time
Calculate how long it takes to drive any distance at a given average speed with our free drive time calculator.