Quick Scaler Pro is a free model scaling app that allows you to quickly scale miscellaneous measurements of various units. It is designed for model makers and model owners. It works on the fly so there is no need for manual scaling process initiation - it scales as you type in.
Quick Scaler Pro offers three converting modes:
Used to determine model size based on the actual object size and a desired scale. Scale can be chosen from pre-defined number of scales or entered manually.
Used to find object size based on the model size. As above - different scales can be used along with different unit types.
Used to find scale if both the object size and model size are known. Mixed unit types can be used at any time.