Building or renovating a kitchen? We can help.
Our expert designer uses Cyncly 2020 software and works with you to create a space that is both beautiful and functional.
Book a Design Consultation
What can we help you find today?
Contractor-grade plumbing and heating supplies for Brooklyn trades and homeowners.
Radiator / Baseboard Sizing Calculator
Step 1: Calculate room BTUs using ft³ × 4. Step 2: Choose the product type to calculate sections or linear feet.
Room length (ft)
Room width (ft)
Ceiling height (ft)
Product type
System type
Cast iron size
- 19″ and 25″ heights are mostly personal preference, but plan around window height.
- 19″ radiators are only available in 4-tube.
- 4-tube ≈ 4.5″ wide, 6-tube ≈ 6⅞″ wide — plan around room footprint.
Runtal Contractor Series Calculator
This tool estimates room BTUs using ft³ × 4, then recommends a Contractor Series length based on published BTU/hr per foot.
Room length (ft)
Room width (ft)
Ceiling height (ft)
Model
Select the Contractor Series model.
Output basis
Uses the published BTU/ft values for the selected basis.
Contractor Series lengths are typically 2’–14’. If your result exceeds 14’, consider splitting across multiple units or selecting a higher-output model.