BalloonCalc Free - Scientific Calculator with Unit System

BalloonCalc - Scientific Calculator with Unit System
- Fun and powerful calculator.
- It's like a SMS messaging app.
- It can recognize and convert SI / US / Imperial units.
- Support 88 world-wide currencies.

【 Main functions of BalloonCalc 】

✔ User interface
- Conversational way of calculation : BalloonCalc shows expressions and answers as balloons like SMS messaging apps.
- String interpretational way of calculation : You can easily calculate, copy and paste complex expressions.
- Intuitive re-use : The previous expressions and answers can be re-used by double-tapping each balloon.

✔ Unit calculation
- Easy use of units : Just add units after numbers like 1 km + 3 × 200 m. BalloonCalc automatically calculates the answer.
- Unit conversion : Add a unit after the arrow sign like 3.5 ℓ ➔ cc.
- Support SI / US / Imperial units : 424 units of 56 categories
- Support SI prefixes : Giga, Mega, kilo, micro, femto, etc.

✔ Sci/Eng calculation
- Support various mathematical functions : trigonometric, exponential, logarithm, factorial functions and more
- Support variables : Variables can be created like V_car = 60 kph + 20 mph.
- Support physical/mathematical constants : gravitational acceleration, Planck constants, golden ratio, etc.

✔ And more
- Exchange rates : 88 currencies are supported.
- Auto-complete buttons : When you type a string, BalloonCalc searches units, constants, variables and functions and shows the results as a form of button array.
- Favorite items : You can easily browse and select favorite units, constants and functions from a list.
- File management : You can create a new file, open a file, save a file and export it to a text.
- Interactive help : BalloonCalc helps you to learn about the various features, step-by-step.

※ Free version has iAd or limitation of 20 lines.