1. Home
  2. 🔧 Utilities
  3. Calculator Keyboard
Calculator Keyboard - Calku

Calculator Keyboard - Calku

Calculate from your keyboard

475 ratings
42 reviews
🔧 Utilities
Free
In-App Purchases

Details

  • Released
  • Updated
  • December 30, 2020
  • December 21, 2025

Developer

Supagarn Pattananuchart
✨Promote your app ✨
Calculator Keyboard - Calku screenshot #1 for iPhone
Calculator Keyboard - Calku screenshot #2 for iPhone
Calculator Keyboard - Calku screenshot #3 for iPhone
Calculator Keyboard - Calku screenshot #4 for iPhone
Calculator Keyboard - Calku screenshot #5 for iPhone
Calculator Keyboard - Calku screenshot #6 for iPhone
Calculator Keyboard - Calku screenshot #7 for iPhone
Calculator Keyboard - Calku screenshot #8 for iPhone
Calculator Keyboard - Calku screenshot #9 for iPhone
iphone
ipad
🧾$0.99 - $5.99
In-App Purchase↘︎
📌Ready
Reviews summary↘︎
⭐42
Reviews↘︎
📝2+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓5 answered
FAQ↘︎
📦w/o updates
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

About

This app turns your keyboard into a powerful calculator, allowing you to perform calculations directly within any application. Avoid switching apps and copying numbers by calculating on the go, whether you're texting, taking notes, or browsing.

✓Calculate within any app
✓Supports Dark Mode
✓Customizable decimal points
✓Scientific calculator functions
✓Calculation history access
✓Keyboard feedback options
Show original description

What users say

Summarized from real user reviews of Calculator Keyboard. Based on 475 reviews and a 4.7/5 average, it highlights the 10 positives and 7 negatives reviewers mention most about this Utilities app.

Positive things

  • 👍Very useful application
  • 🚀Handy calculator within keyboard
  • 💡Innovative idea for an app
  • 👍Easy to use
  • 🔒Respects user privacy
  • 💰Good value for paid features
  • ✨Simple and effective
  • 💯Best calculator app
  • 👍Works flawlessly
  • ✅No bugs reported

Negative things

  • 🐛Cannot delete the app
  • 🐛Buggy at times
  • 🐛Non-standard division/multiplication symbols
  • 🐛Incorrect calculations
  • 🐛Doesn't work on all apps initially
  • 🐛Difficult to add keyboard
  • 🐛No scientific calculator
See all reviews

What's New in Calculator Keyboard

3.9

December 21, 2025

• Performance improvements • Bug fixes

Subscription plans

Calku PRO (1 Month)

Unlimited Access to All Features.

$0.991 Month
How to cancel Calculator Keyboard subscription ⁉️
2

In-App Purchases

$5.99

Calku Pro - Lifetime

Unlock All Features

User reviews

Most RecentHighest RatedLowest Rated

Fix pls

Thêm dấu phẩy phân cách hàng ngàn ở các số đầy đủ luôn nha
Anthony aaaaAnthony aaaa

It now works after a restart! It only works on apple mail and apple notes?????

Update: switching to 5 stars since it now finally works on all my apps after restarting my phone!

What is going on? The app only works on apple mail and notes? I might need a refund in this case! I am using it on the latest ios public build on an iPhone 15 pro max
markaznar1979markaznar1979

棒

超方便，超好用
jfjdhshshzhdhjfjdhshshzhdh

Really Bad Advertisement

Cannot use text saving at all
NlknlkNlknlk

Nice one

Good calculator keyboard, but require hepatic on pressing keys also pop up keys.
devin23031986devin23031986
See 37 more reviews

Developer apps

Split Screen - Multitasking
Split Screen - Multitasking

Multi View Web Browser

🔧 Utilities

(74)

Free
In-App Purchases
Text Editor - Document Editor
Text Editor - Document Editor

Edit Texts & Replace Words

🛠️ Developer Tools

(124)

$1.99
Image Resizer - Photo Compress
Image Resizer - Photo Compress

Compress & Resize Photos

📷 Photo & Video

(197)

Free $0.99
In-App Purchases
Date & Time Calculator +
Date & Time Calculator +

Duration Between Two Dates

🔧 Utilities

(109)

$0.99
PiP - Picture in Picture
PiP - Picture in Picture

Background Music, Video Player

🔧 Utilities

(301)

Free $0.99
In-App Purchases
See developer apps

User experience

🐞

Reported Bugs

7 issues

Cannot delete the app

Bug

App is buggy sometimes

Bug

Non-standard division and multiplication symbols not recognized by other apps

Bug

Incorrect calculations (e.g., 3.10 / 1000 = 0)

Bug

App only works on Apple Mail and Notes initially

Bug

Cannot get it to 'Add Keyboard' on specific devices/iOS versions

Bug

No scientific calculator available

Bug
✨

Requested Features

8 requests

Add thousands separator for numbers

Feature

Haptic feedback on key presses

Feature

Option to hide computation in text box

Feature

History button on main page

Feature

Option for standard multiplication and division

Feature

Add scientific/accountant calculator

Feature

Add Pi, square root, etc. to calculator

Feature

Vibration on touch

Feature

FAQ

What does this app do?

This application transforms your device's keyboard into a fully functional calculator. It allows you to perform calculations directly within any app you are using, eliminating the need to switch between applications or copy and paste numbers.

What are the key features of this calculator keyboard?

Key features include the ability to calculate within any app, support for Dark Mode, customizable decimal points, a powerful scientific calculator, access to your calculation history, and keyboard feedback options like sound and haptics.

Is this app free to use?

The application is free to download and use, offering core calculator functionalities. It also includes in-app purchases, which may unlock additional features or customization options for users who wish to enhance their experience.

What apps is this calculator keyboard compatible with?

This calculator keyboard is designed to be compatible with a wide range of applications. This includes messaging apps like Messages, Messenger, WeChat, and Line, as well as browsers like Safari, note-taking apps, mail clients, and many more.

How does this app help with daily tasks?

It simplifies daily tasks by integrating calculation capabilities directly into your typing experience. Whether you're quickly checking a price while shopping, solving a problem for homework, or managing finances, you can do so seamlessly without interrupting your workflow.