# Unit Converter - Henkankun — Convert 100+ units instantly

> Convert 100+ units instantly (iPhone/iPad app by Takumi Kinjo.)

- Source: https://appshunter.io/ios/app/unit-converter-henkankun/id6758116488 (this page in markdown: same URL + `.md`)
- Developer: [Takumi Kinjo](https://appshunter.io/developer/1870472112)
- Category: Utilities, Lifestyle
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 46 MB
- Languages: English
- Released: 2026-01-28
- Data updated: 2026-07-09
- User reviews in markdown: https://appshunter.io/ios/app/unit-converter-henkankun/id6758116488/reviews.md

## What is Unit Converter?

Henkankun - Your Ultimate Unit Converter

"How many kilometers is 1 mile?" "What's 98°F in Celsius?"
Get instant, accurate answers with this powerful unit conversion app.

KEY FEATURES
18 Categories, 100+ Units
• Length (m, km, in, ft, mi...)
• Mass (g, kg, lb, oz...)
• Temperature (°C, °F, K)
• Area, Volume, Speed, Time
• Pressure, Energy, Power
• Concentration, Fuel Economy, Angle, Frequency
• Flow Rate, Torque, Rotation
• Currency (USD, EUR, JPY + 14 more)

Real-Time Conversion
See multiple conversion results instantly as you type. Compare units at a glance.

One-Tap Swap
Quickly switch between source and target units. Reverse calculations in a flash.

Favorites & History
Save frequently used conversions. Access your conversion history anytime.

High-Precision Engine
Powered by Decimal-based calculations for accurate, error-free results.

PERFECT FOR
• Cooking: cups & oz → mL & g
• Travel: miles → km, °F → °C
• DIY & Crafts: inches → cm
• Work: PSI → Pa, gallons → L
•Study & Research: Quick unit system conversions

DESIGNED FOR SIMPLICITY
• Clean, intuitive interface
• Dark mode support
• English & Japanese languages
• Customizable decimal places & rounding
• Non-intrusive ads for a smooth experience

FULLY OFFLINE
No internet required. Use it anywhere, anytime — even while traveling abroad with no data worries!

From daily life to professional work, Henkankun handles all your unit conversion needs.


## Version history (last 5 releases)

### 1.5.0 — 2026-07-07

We have implemented the “Data Capacity and Data Transfer Speed” category, “Shakkanho Units,” and “Calculation Formula Input.”

### 1.4.1 — 2026-04-01

Bug Fix
 - Fixed an issue where all saved favorite conversions were displayed with the same icon (length) regardless of their category. 
Each conversion now correctly shows its corresponding category icon (temperature, volume, currency, etc.).

### 1.3.0 — 2026-03-25

Your recent translation history is now displayed on the app's home screen.

### 1.2.0 — 2026-03-23

What's New

• Smart Clipboard Detection
Copy a number in another app, then open Converter-kun to auto-convert it. Tap to set the value and convert instantly.
- Detects clipboard numbers on app resume
- One-tap conversion via SnackBar
- Toggle ON/OFF in Settings

• Recent Conversions Chips
Up to 3 recent conversions as chips on the home screen. Tap to restore the pair and value.
- Chips like "100 cm → inch"
- Auto-switches category and restores value
- No more repeating the same conversions

### 1.0.18 — 2026-03-16

I removed the ad.

## More apps by Takumi Kinjo

- [Calm Blocks -Block Puzzle Game](https://appshunter.io/ios/app/calm-blocks-block-puzzle-game/id6758036903)

All apps by Takumi Kinjo: https://appshunter.io/developer/1870472112

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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 2026-07-09.*