Calk-AU: Aussie Calculators
Tax, pay, mortgage, super, GST
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
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.
• New: Remove ads — a one-time purchase that turns off all ads forever (find it in the footer)
• Or watch a short video for 24 hours ad-free
• Restore purchases works across your devices
• All 130 calculators are on current FY 2026-27 rates
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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Konstantin Iakovlev
- Size
- 99.2 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+
- Contains
Advertising
- In-App Purchases
Yes
- Remove Ads $3.99
- Copyright
- © 2026 Konstantin Iakovlev