One16 - Fraction Calculator 4+

Decimal to Fraction Converter

Code Carton

    • 4.9 • 12 Ratings
    • Free
    • Offers In-App Purchases

iPhone Screenshots


Making stuff is fun. Math isn't. Making the most of our precious time in the shop is critical. One16 can help. One16 was designed to respect your time, reduce errors, and make the mundane math operations less painful.

Introducing Actions.
Automate common calculations into fast actions. One of our favorites is calculating board feet. We ship One16 with a few to get you started. But creating your own is where the power of Actions shines.

The next time saver are widgets. Designed with glanceability at their core. They give you quick references to your critical measurements without unlocking your phone or opening the app.

We reference the same value multiple times. But not for related steps. Equation Builder saves you time by quickly reusing previous values. Double tap a previous value to copy it to your active term.

Privacy is at the core of all our products. One16 doesn't track any data about you or your usage. If you do find a bug, please reach out to us! We will do our best to get it fixed in a timely manner. We love chatting with our users!

Full feature list:
- Actions
- Widgets
- Rounding Presets (1/64, 1/32, 1/16, 1/8, 1/4, 1/2, 1)
- Denominator Keyboard
- Left-handed keyboard
- Equation Builder
- Decimal to Fraction conversion
- Simplify fractions
- Add, Subtract, Multiply, Divide fractions and decimals
- Privacy Focused

One16 is built by a weekend woodworker with a family and full-time job. This is who this app is designed for. Have a feature suggestion? Let us know!

What’s New

Version 2.2.2

- Fixed app freezes on initial launch for some users
- Added call to action in setting screen for free users

Ratings and Reviews

4.9 out of 5
12 Ratings

12 Ratings

Zen@Work ,

Woodworkers: this is the one you're looking for.

I've looked at literally every one of these on the App Store. Every. Bloody. One. This is the only one that performs the conversions easily and without fuss, isn't a stupidly-unreasonable amount of money, isn't a subscription, isn't driven by bait-and-switch in-app purchases, and isn't inundated with ads and pop-ups.

It's fast, clean, accurate, and does what it says on the tin. And manages all of that for a reasonable, flat rate.

I also emailed a couple suggestions to the developer, who was responsive, intelligent, and a downright nice guy to boot.

Worth. Every. Dime.

Developer Response ,

Thank you for the kind words! Thank you again for reaching out, it was a joy to connect!

Forcedndontlikit ,

Very good app

I originally gave this app a two star. Not because of how you use it but rather because I did not notice that there was a one time charge. Since then it was pointed out that there is notice of a one time charge and I feel it fair to say that this app is worth the charge. I have found it useful when building projects. And it is simple to use.

Developer Response ,


Thank you for taking the time to share your thoughts about our woodworking app. I appreciate your feedback and am glad to hear that you find my app useful.

I apologize for any confusion regarding the app's pricing structure. Transparency is important to us, and we are sorry if this wasn't clear at the outset. To clarify, the app is a one time purchase from the App Store. The price was listed on the Purchase button and confirmation dialog Apple presents when confirming the purchase.

You are welcome to reach out to Apple for the steps required to get a refund for the purchase. Since the purchasing is handled through Apple and its App Store, I don’t have any way of refunding the purchase.

If you have any more questions or require further assistance, please feel free to reach out to me at

Best regards,
Code Carton

BuilderOfWoodenThings ,


The app is simple to use, does what claims to do, doesn't collect personal data, doesn't need a subscription, and is not cluttered with ads. Worth every penny I paid. The developer also listens and responds to feedback!

Developer Response ,

Thank you for the kind words!

App Privacy

The developer, Code Carton, 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 Linked to You

The following data may be collected and linked to your identity:

  • Purchases

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

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