# Japan-US Unit Conversion — Japan-US Unit Conversion

> Converts units between Japan and US standards for various measurements. (iPhone/iPad app by Koya Nambo.)

- Source: https://appshunter.io/ios/app/japan-us-unit-conversion/id6450624167 (this page in markdown: same URL + `.md`)
- Developer: [Koya Nambo](https://appshunter.io/developer/1633778504)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 4.81/5 from 16 App Store ratings
- Age rating: 4+
- Requires: iOS 16.2 · 18 MB
- Languages: English, Japanese
- Released: 2023-06-26
- Data updated: 2026-07-18
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/japan-us-unit-conversion/id6450624167/reviews.md

## What is Japan?

This is a handy tool for easy and convenient everyday unit conversions. It is equipped with features useful in various situations, from travel and daily life to work and study. 
With this app, you can convert units in the following categories:

1. Length (millimeters, centimeters, meters, kilometers ↔ inches, feet, yards, miles)
2. Weight (milligrams, grams, kilograms, tons ↔ ounces, pounds, stones, short tons)
3. Speed (meters/second, kilometers/hour ↔ feet/second, miles/hour)
4. Volume (cubic millimeters, cubic centimeters, cubic meters, liters ↔ cubic inches, cubic feet, fluid ounces, gallons)
5. Temperature (Celsius ↔ Fahrenheit)
6. Area (square millimeters, square centimeters, square meters, hectares ↔ square inches, square feet, acres)
7. Currency (dollars ↔ yen, using the latest exchange rate)
8. Timezone (Japan Standard Time ↔ Eastern Standard Time, Central Standard Time, Mountain Standard Time, Pacific Standard Time, Alaska Standard Time, Hawaii Standard Time)

[Premium Version]
- No ads within the app
- Unlimited number of favorite registrations

Terms of Use: https://kn-factory.hatenablog.com/entry/2023/06/25/124505
Privacy Policy: https://kn-factory.hatenablog.com/entry/2023/06/25/124429

## Key features

- Length conversion
- Weight conversion
- Speed conversion
- Volume conversion
- Temperature conversion
- Area conversion
- Currency conversion
- Timezone conversion

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium | $3.99 | one-time |



## Frequently asked questions about Japan

### What units can Japan-US Unit Conversion convert?

Japan-US Unit Conversion can convert units for length, weight, speed, volume, temperature, area, currency, and time zones between Japanese and US standards.

### Does Japan-US Unit Conversion have ads?

Yes, Japan-US Unit Conversion contains advertisements. Users can remove ads by purchasing the premium version.

### What is the premium version of Japan-US Unit Conversion?

The premium version of Japan-US Unit Conversion offers an ad-free experience and allows for an unlimited number of favorite unit registrations.

### What devices support Japan-US Unit Conversion?

Japan-US Unit Conversion is supported on iPhone and iPad devices.

### How often is Japan-US Unit Conversion updated?

The latest version, 2.0, was released on March 11, 2026. The app is updated periodically to ensure functionality and accuracy.

### What is the age rating for Japan-US Unit Conversion?

Japan-US Unit Conversion has an age rating of 4+, making it suitable for a wide range of users.

### How does Japan-US Unit Conversion handle currency conversion?

Currency conversion in Japan-US Unit Conversion uses the latest exchange rates to provide accurate conversions between dollars and yen.

### Can I save frequently used conversions in Japan-US Unit Conversion?

Yes, you can register favorite conversions. The premium version offers unlimited favorite registrations.

## Version history (last 5 releases)

### 2.0.1 — 2026-05-05

Stability has been improved through updates to internal libraries.

### 2.0 — 2026-03-11

bug fix

### 1.06 — 2023-08-02

We've made corrections to internal processing.

### 1.05 — 2023-07-16

Changed the icon.

### 1.04 — 2023-07-10

Fixed the layout collapse.

## Apps similar to Japan

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Mynaportal](https://appshunter.io/ios/app/mynaportal/id1476359069) | 1.6 (33,015) | Free | Utilities |
| [US Unit Converter](https://appshunter.io/ios/app/us-unit-converter/id1577905442) | 4.8 (101) | Free | Utilities |
| [Unit Converter HD.](https://appshunter.io/ios/app/unit-converter-hd/id481973377) | 4.7 (642) | Free | Utilities |
| [US単位コンバーター - アメリカの時差/単位を変換](https://appshunter.io/ios/app/us/id1607728774) | — | Free | Utilities |
| [MillenVPN](https://appshunter.io/ios/app/millenvpn/id1514053309) | — | Free | Utilities |
| [Unit of measurement converter](https://appshunter.io/ios/app/unit-of-measurement-converter/id1377754425) | 4.7 (372) | Free | Utilities |

## More apps by Koya Nambo

- [電卓カスタム：自分だけのこだわりの電卓](https://appshunter.io/ios/app/id1633778502)
- [Rapid Tap Challenge](https://appshunter.io/ios/app/rapid-tap-challenge/id1636176761)
- [Smart Convert - Base Converter](https://appshunter.io/ios/app/smart-convert-base-converter/id6450381653)
- [MathTre -Simple Math Workout-](https://appshunter.io/ios/app/mathtre-simple-math-workout/id6450848723)
- [TaskTetra: ToDo management App](https://appshunter.io/ios/app/tasktetra-todo-management-app/id6460933735)

All apps by Koya Nambo: https://appshunter.io/developer/1633778504

## Related topics

[koya nambo](https://appshunter.io/ios/topics/koya-nambo)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-18.*