Calto: Note Calculator
calculate w/ variables & units
Free · Designed for iPad. Not verified for macOS.
A smart calculator that works like math notes.
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Just type "price = 12000" and you're done. Calto is a free smart calculator that lets you write naturally like a math notepad while showing results in real-time.
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Why Calto?
Regular calculators just show numbers.
But real-life calculations are more complex.
- Planning a trip budget and splitting expenses
- Converting currencies while budgeting
- Calculating tips, discounts, or freelance rates
Calto handles all of this naturally, like taking notes.
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Key Features
# Variables
coffee = 4.50
lunch = 12.00
coffee + lunch = 16.50
Name your numbers. Make calculations meaningful.
# Exponent Calculations
2^10 = 1,024
3^3 = 27
Power calculations in one line.
# Natural Unit Conversion
10km in mile = 6.21
25C in F = 77
500g in oz = 17.64
100m2 in acre = 0.025
80+ units supported. Length, weight, volume, temperature, time, area, angle.
# Live Exchange Rates
100 USD in EUR = 92.50
50 GBP in JPY = 9,375
6 major currencies. Auto-updated every 24 hours.
# Mixed Currency Math
100 USD + 50 EUR = $154.25
Different currencies in one calculation. Just works.
# Date Calculations
today + 30days = 2026-03-04
today + 2weeks = 2026-02-16
Project deadlines, travel dates made easy.
# Percent & Tip Calculator
20% of 5000 = 1,000
15% tip on 85 = 12.75
Discounts, tips, split bills. Type what you think.
# Crypto Calculator
1 BTC in USD = 97,500
0.5 ETH in EUR = 1,650
Live cryptocurrency rates. Track your crypto portfolio.
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Perfect For
- Trip budgeting and expense tracking
- Freelancers calculating rates and invoices
- Quick tip calculator and bill splitter
- Real-time exchange rate conversions
- Anyone tired of basic calculators
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Privacy First - Offline Calculator
- All calculations stored on device only
- Works offline - no internet required for basic math
- Only anonymized usage statistics collected (for service improvement)
- No account required
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Support
Email: iamjw.dev@gmail.com
Website: https://calto.iamjw.kr
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Download this free calculator now and experience math notes done right.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
# v1.8.0 Release Notes (English)
A full iOS-native design pass, VoiceOver support, and smarter variable names.
- Design renewal: icons, menus, dialogs and settings now follow iOS conventions, with a developer monospace font in the editor and results
- VoiceOver support: every line's result is read out together with its expression
- Your theme now drives the appearance of system surfaces like the keyboard and share sheet
- The accessory bar follows your editing focus and no longer collides with the home indicator
- A name you assign wins over built-ins — `today`, aggregate keywords and coin codes no longer hijack your variable
- Results render at one consistent size across the document and stay readable when you change the system text size
The developer, JONGWOO PARK, 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:
- Location
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- JONGWOO PARK
- Size
- 31 MB
- Category
- Productivity
- Compatibility
Requires iOS 15.6 or later.
- iPhone
Requires iOS 15.6 or later. - iPad
Requires iPadOS 15.6 or later. - iPod touch
Requires iOS 15.6 or later. - Mac
Requires macOS 12.5 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 iamjw.dev