Online tools from David Estey Piano Service and Piano Buyers can be used for piano appraisals. However, they are not likely to return an accurate value because of variations in appraisal methods and in the condition of the piano being appraised.
Appraising a piano is time-consuming and requires some expertise as well as either a physical inspection or high-quality photos and copies of maintenance and restoration records. If the buyer is interested in trading in his piano to upgrade to a more expensive model, some companies are willing to perform a free appraisal to assess the value of the instrument they might soon possess. At Learn-Piano, experts recommend searching websites such as eBay for a piano similar to the one being appraised to get a general estimate of its value. Other appraisers use a depreciation schedule or subtract the restoration cost from the value of a mint condition piano.