Units Free

Convert between many units from several categories and different unit systems (metric, imperial, ...).

Features:

• categories: length, temperature, capacity, weight, energy, power, pressure, area
• access previous conversions from the history list
• categories have different colors (in the history as well)
• flip units
• send calculations by email
• support for the iPhone 6 and 6+
• support for the iPad multitasking (split view..)

(Free version: requires upgrade to arbitrarily switch categories)