Zombie Invasion Calculator
Simulate zombie outbreak scenarios and test humanity's survival chances
👥 Human Population
Small town (10K) to major city (8M+)
Higher = more people flee, lower = more fight
Rick Grimes (The Walking Dead)
Former sheriff with excellent survival instincts and leadership
Win rate: 85%
Ellie (The Last of Us)
Resourceful and fluid fighting style, immune to infection
Win rate: 80%
Shaun (Shaun of the Dead)
Average person with cricket bat, learns to survive
Win rate: 45%
Tallahassee (Zombieland)
Zombie-killing machine with creative weapon skills
Win rate: 90%
Negan (The Walking Dead)
Ruthless leader with Lucille bat, strategic fighter
Win rate: 88%
Average Person
Typical untrained civilian with basic survival instincts
Win rate: 30%
🧟 Zombie Horde
Patient zero (1) to zombie horde (1000+)
Chance attacked human becomes zombie
How often each zombie encounters humans
Percentage that stand up after being killed
Walker (Walking Dead Style)
Slow-moving, decaying zombies that shamble towards victims
Speed: 20% catch rate
Runner (28 Days Later Style)
Fast, aggressive infected that can sprint and climb
Speed: 80% catch rate
Classic Romero Zombie
Traditional slow zombies with relentless pursuit
Speed: 30% catch rate
Modern Zombie
Balanced speed and aggression, modern movie style
Speed: 60% catch rate
⚙️ Simulation Settings
Simulation will stop early if one population is eliminated
📊 Simulation Results
Zombie apocalypse! Humanity extinct after 5 days
The undead have overrun humanity! The world belongs to zombies now.
Population Changes Over Time
Interactive chart showing population dynamics
Humans (blue line) vs Zombies (red line)
🧮 Simulation Algorithm
1. Zombie Attacks
Attacks = Zombies × Attack Frequency
2. Human Response
Flees = Attacks × Defense Stance
3. Combat Resolution
Deaths = Failed Escapes + Lost Fights
4. Transformation
New Zombies = Deaths × Transform Rate
5. Population Update
Account for resurrections & starvation
🛡️ Zombie Survival Tips
Rule #1: Cardio
When the zombie outbreak first hits, the first ones to go are the slow and out of shape
Rule #2: Double Tap
Make sure the zombie is really dead before moving on
Rule #3: Bathrooms
Always check bathrooms before you go - zombies love confined spaces
Choose Melee Weapons
Guns make noise and attract more zombies. Silent weapons are better
🧟 Zombie Science
Brain Obsession
Zombies crave brains because they lack their own functioning neural tissue
Viral Transmission
Most modern zombie stories involve viral or parasitic infection
Real Zombie Fungi
Ophiocordyceps fungi actually control ant behavior, creating "zombie ants"
Cultural Origins
Zombie concept comes from Haitian Vodou traditions of the living dead
Understanding the Zombie Invasion Model
What is the Zombie Invasion Model?
This calculator simulates a zombie outbreak using a day-by-day population dynamics model. Unlike simple exponential growth models, it accounts for human resistance, zombie limitations, and realistic survival scenarios based on established zombie fiction tropes.
Key Model Features
- 🧟Limited Attacks: Each zombie can only attack a certain number of humans per day
- 👥Human Strategy: People can choose to flee or fight when encountering zombies
- ⚔️Combat Outcomes: Fighting success depends on character skills and zombie type
- 🔄Resurrection: "Dead" zombies can come back to life
- 🍽️Starvation: Zombies may die if they can't find food
Algorithm Steps
Daily Simulation Cycle
- Calculate total zombie attacks for the day
- Determine how many humans flee vs fight
- Resolve escape attempts and combat
- Count human casualties and transformations
- Account for zombie deaths and resurrections
- Apply starvation effects if enabled
- Update populations with randomness factor
Critical Parameters
- • Transformation Rate: How easily humans become zombies
- • Fighting Skills: Human survival capability in combat
- • Zombie Speed: Escape success rate
- • Resurrection Rate: Zombie durability
Randomness Factor: The model includes slight randomness (±10%) to simulate unpredictable real-world events, making each simulation unique even with identical starting parameters.