Calk-AU: Aussie Calculators
Tax, pay, mortgage, super, GST
Free · Designed for iPad. Not verified for macOS.
124 free calculators on the latest 2025–26 ATO rates. Works fully offline — and updates itself when the rules change. Tax, pay, mortgage, super, GST and more.
Calk-AU puts 124 free Australian calculators in your pocket — tax, pay, mortgage, super, GST and far more — all built on the current 2025–26 ATO rates.
No sign-up. No paywall. And it works 100% offline: run any calculation on the train, in a meeting or out of range. When the rates or rules change, the app updates its formulas automatically — so your numbers are always current.
KNOW YOUR REAL MONEY
• Income Tax — 2025–26 brackets, Medicare levy and the low-income offset
• Pay Calculator — take-home pay after tax, super and HECS
• HECS-HELP — the new marginal repayment system
• GST — add or remove 10% in a tap
• Capital Gains, FBT, PAYG, payroll tax and more
PROPERTY & LENDING
• Mortgage repayments, offset savings and extra-repayment scenarios
• Borrowing power, LMI, stamp duty and first-home-buyer help by state
• Car, personal and comparison-rate loan tools
SUPER, BUDGET & LIFE
• Superannuation, employer contributions and pensions
• Budget planner, net worth, compound interest and FIRE
• Health, vehicle and energy calculators
MADE FOR THE APP
• Save any calculation to your history
• Favourite the tools you use most
• Share results via WhatsApp, email or SMS
• Light and dark mode
Every formula is based on official ATO, Services Australia and state-revenue rules, with clear breakdowns so you can see exactly how each number is worked out.
Calk-AU is free to use. It provides estimates for general information and isn't financial or tax advice.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Konstantin Iakovlev, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Konstantin Iakovlev
- Size
- 76.4 MB
- Category
- Finance
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Konstantin Iakovlev