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Last updated on: 2026-05-31
Android Apps > Tools > d20 Attack Calculator
d20 Attack Calculator icon

d20 Attack Calculator

2.0
Hapero.fi
4.57
17 reviews
500+
Downloads
$0.99

Roll, estimate, and optimize your attacks in d20 RPG systems.

Not recently updated — last update was on 2023-10-30. This app may no longer be actively maintained.
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About d20 Attack Calculator

d20 Attack Calculator is a tools app developed by Hapero.fi.

Download Statistics

d20 Attack Calculator has been downloaded 890 times. In the last 30 days, the app was downloaded 0 times.

User Ratings

d20 Attack Calculator is rated 4.57 out of 5 stars. The rating is based on 17 ratings.

App Information

d20 Attack Calculator costs $0.99 to download. The APK download size is 4.46 MB. The latest version available is 2.0. The last update was on October 30, 2023.

Technical Requirements

The app has a content rating of Everyone. The app has been available on Google Play January 2014.

Description
d20 Attack Calculator is a powerful combat calculator, optimization tool, and dice roller for d20 RPG systems such as Pathfinder RPG or D&D 3.0 / 3.5 / 5th Edition. Use this program to roll dice for your complex attack routines and evaluate your character build from visual graphs and dice roll statistics.

Features:
* Attack calculator and dice roller / calculator
* Plot key statistics for your dice rolls:
- Expected (average) damages
- Hit chances
- Dice roll distribution and averages
* Analyze your DPR (damage-per-round) and appropriate challenge rating
* History data for your d20 attack rolls

The DPR analysis can be used to tell you how long it takes you to solo a monster of a given CR (or AC), on average, providing players a rough measuring tool to estimate their power level.

See more information on how the DPR calculations are done and a tutorial on "how to determine when to use Power Attack" at: http://www.hapero.fi/d20/

If you would like to test the program, check out the free Lite version. This full version includes all the features of the Lite version an in addition:

* Unlimited saving and loading of attack routines and plotted graphs
* Hit chance graphs for attacks
* Multiple buffs/debuffs to attacks
* Export plotted data to other programs
* More statistics and graph data from your past d20 rolls

What's New?

Ver. 1.9: Improved dice roller: compute powers, multiplications, divisions, and roll High/Low rolls. E.g.: 4d6H3 - roll 4d6 and keep the 3 highest dice. 2d20L - roll 2d20 and keep the lower dice.

Ver. 1.8: Support for 5th Edition rules and Advantage/Disadvantage buffs. Roll distributions can now be evaluated in the Stats dialog to get the chance of scoring more/less than a given dice roll. Customization: "Use Target AC" option can now be disabled from the Settings. Added an option to show chances for "all attacks miss" curve. Minor bug fixes. I'm still quite new to the 5th ed. rules, so all feedback is very welcome!

Ver. 1.7: Added a generic dice roller, which can also show stats such as averages and result distribution for the roll. Minor bug fixes.

Ver. 1.6: Added Quick Buffs to attacks for faster bonus controlling. The history of the past d20 rolls can now be monitored from the Data and Settings page.

Recent changes:
Updated to support Android 13. Minor bug fixes.
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More data about d20 Attack Calculator

Price $0.99
Total downloads 890
Recent downloads 0
Rating 4.57 based on 17 ratings
Ranking Not ranked
Version 2.0
APK size 4.46 MB
Number of libraries ?
Suitable for Everyone
Ads NO ads

App Performance Report

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d20 Attack Calculator compared with similar apps

Common keywords of similar apps

Attack Calculator Attacks Data Ver Graphs Statistics Dpr Version Buffs Minor Bug Fixes Estimate Systems Tool Edition Program Routines Average Hit Chances Distribution Averages Ac Power Lite Plotted Chance Past Rules Stats Option Settings Show Dice Roll Rolls Roller Rpg Added Features History Support

Keywords missing from this app

App Games Custom Game Random Rolling Board Risk Recent Die Results Battle Number Result Easy Tap Add Time Share Symbols Fast Quick Generator Dndice Create Themes Dnd Experience Ads Choose Set Dicely Crit Throw Text Numbers Perfect Tabletop Powerful Dungeons Dragons

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Google Play Rating history and histogram

8
6
0
0
0

Downloads over time

d20 Attack Calculator has been downloaded 890 times. Over the past 30 days, it has been downloaded 0 times.

Changelog of d20 Attack Calculator

  • Oct 30, 2023UpdateVersion 2.0
  • Nov 29, 2019Installs500+ installs
  • Aug 21, 2018UpdateVersion 1.9
  • Jul 12, 2017UpdateVersion 1.8
  • Sep 26, 2016UpdateVersion 1.7
  • Apr 6, 2016Installs100+ installs
  • Mar 6, 2016UpdateVersion 1.6
  • Dec 6, 2015Price IncreaseNew price: $0.99 ($0.91)
  • Oct 7, 2015UpdateVersion 1.5
  • Jun 8, 2015UpdateVersion 1.4
  • May 9, 2015Installs50+ installs
  • Jun 3, 2014UpdateVersion 1.3
  • Mar 5, 2014Installs10+ installs
  • Jan 24, 2014New AppVersion 1.2 in Tools for $0.91
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Developer information for Hapero.fi

Hapero.fi

pekka.miettinen@hapero.fi

Website

N/A

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Comments on d20 Attack Calculator for Android

★★★★★ Robby Wendel · Sep 22, 2021
Excellent app. Many options and incredibly useful for planning builds. Would be nice to see triple advantage as an option, but only Elves with the correct feat have this option so not too common.
★★★★☆ Chris Depot · Jan 18, 2017
Extremely useful, a bit tiring on ones fingers (retyping the same things a lot) I love the app, but a few suggestions that would earn a 5star: 1) Shared data folders. I bought the full version to export, only to find they weren't shared. I had to reenter my numbers. 2) I often use the different attacks as different weapons, by enabling only one attack at a time when using plot to graph. Being able to rename each attack would be extremely nice. (Ie: Rapier instead of Attack1, and automatically showing up as Rapier when I use plot to graph, without having to rename it there every time)
★★★★★ A Google User · Apr 23, 2014
Incredibly useful app Wonderful app for handling all the attacks of a 2 weapon fighter. Lots of flexibility for adjusting the attacks and damage per swing. Would love the option to save different attack sets for simpler access!
★☆☆☆☆ Matthew McKee · Apr 20, 2015
Great App, but unusable without overflow menu I love the functionality of the application, but without the addition of an overflow menu, you can't access many of the features on devices without a physical menu key. If that was fixed, it would be 4 or 5 stars.

Google Play Rankings for d20 Attack Calculator

This app is not ranked

Technologies used by d20 Attack Calculator

d20 Attack Calculator is requesting 4 permissions and we don't have library information (yet).

Permissions

Development tools
test access to protected storage
Network communication
full network access
Storage
modify or delete the contents of your USB storage
Hardware controls
control vibration
We haven't collected library information for this app yet. You can use the AppBrain Ad Detector app to detect libraries in apps installed on your device.
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