Burd and Sons' Piano Tuning Frequency Calculator
Please Note: This is only a general guide, and I may alter my recommendation based on things (like loose tuning pins, for example) which cannot be determined without seeing the piano in person.
Find your custom tuning interval
Recommendation
Every 12 Months
The 'Burd & Sons' standard for established home pianos.
Book This Interval Now New (1-2 yrs) Mature (3-50 yrs) Vintage (50+ yrs)
Controlled Standard Room Near Windows/Vents
Small Upright Studio/Grand Large Grand
Rarely Played Regular Hobby Teacher/Church/Pro
Standard Ear Refined Ear High Performance
You might enjoy reading This Blog Article which explains why and how the factors in this tool affect tuning frequency.