Calculator Input
Example Data Table
| Scenario | Attacker | Defender | Rules Enabled | Suggested Runs |
|---|---|---|---|---|
| Small land attack | 3 Infantry, 1 Artillery, 1 Tank | 2 Infantry, 1 Tank | Artillery support | 5,000 |
| Air supported attack | 4 Infantry, 2 Tanks, 1 Fighter | 3 Infantry, 1 Artillery, 1 AA Gun | AA fire and artillery support | 10,000 |
| Sea battle | 1 Submarine, 1 Destroyer, 1 Cruiser | 1 Submarine, 1 Carrier, 1 Fighter | Sub opening fire | 10,000 |
| Capital strike | 8 Infantry, 4 Artillery, 5 Tanks, 3 Fighters | 7 Infantry, 2 Tanks, 2 Fighters, 2 AA Guns | All options | 25,000 |
Formula Used
The calculator uses repeated battle simulation. Each unit rolls one six-sided die during its firing step. A hit occurs when the die result is less than or equal to that unit’s attack or defense value.
Single die hit chance = combat value / 6
Estimated win chance = winning simulations / total simulations × 100
Average IPC remaining = total surviving IPC value / total simulations
Infantry supported by artillery attack at 2 instead of 1. Submarines may fire in an opening step when the enemy has no destroyer. Defending AA guns fire once against attacking air units. Battleships can absorb one hit before being removed when the shield option is enabled.
How to Use This Calculator
- Enter the number of attacking units in the first unit grid.
- Enter the number of defending units in the second unit grid.
- Set simulation runs. Higher values give steadier odds.
- Add AA guns if the defender has anti-air fire.
- Choose casualty handling based on your battle plan.
- Enable special rules that match your table version.
- Press Calculate Odds to show results above the form.
- Use the CSV or PDF buttons to save your report.
Strategic Battle Odds Guide
Why Odds Matter
Axis and Allies battles can change a whole campaign. One attack may open a capital. Another may drain units without real gain. This calculator helps you test those choices before rolling dice. It does not promise a result. It estimates risk using many possible battles.
Reading the Result
The attacker win rate shows how often the attacking force cleared the defender. The defender hold rate shows how often the defender survived. The retreat rate appears when the round limit stops a battle before either side is destroyed. That setting is useful when you want to model planned retreats.
Unit Mix
Cheap infantry absorbs hits well. Artillery improves attacking infantry. Tanks add stronger attack power. Fighters defend strongly and project force across the map. Bombers hit hard, but they defend poorly. Naval units behave differently because submarines, destroyers, and battleships create special cases.
Special Rules
Submarine opening fire can change sea battles. Destroyers cancel that advantage in many common rule sets. AA guns reduce air strength before normal combat. Battleships can take one damage before sinking. These rules are simplified here, yet they give a useful planning model.
Casualty Planning
Casualty order is a major strategic choice. A cheap first profile protects valuable units. A preserve air profile keeps mobile power alive. A land capture profile keeps ground units for territory control. Try several profiles before deciding.
Best Practice
Run small attacks with at least 5,000 trials. Use 10,000 or more for major battles. Compare win rate with average IPC left. A high win chance may still be costly. A lower chance may be acceptable when the reward is decisive.
FAQs
1. What does this odds calculator estimate?
It estimates battle outcomes by running many simulated combats. It reports attacker wins, defender holds, retreats, average rounds, and average surviving IPC value.
2. Does it match every Axis and Allies edition?
No. Editions vary. This tool uses common unit values and simplified special rules. Adjust options to match your table as closely as possible.
3. Why should I increase simulation runs?
More runs reduce random noise. Major battles should use 10,000 or more runs for steadier planning results.
4. How is artillery support handled?
Each attacking artillery can support one attacking infantry. Supported infantry attack at 2 instead of 1 during that combat round.
5. How does anti-air fire work here?
Defending AA guns fire once before regular combat. Each gun can fire up to three shots against attacking air units.
6. What does casualty profile mean?
It controls which units are removed first after hits. Different profiles help model cheap losses, air preservation, or ground capture priorities.
7. What is retreat or unresolved chance?
It is the share of trials stopped by your round limit while both sides still had combat units remaining.
8. Can I download the result?
Yes. After calculating, use the CSV button for spreadsheet data or the PDF button for a simple printable report.