Founder, developer and editor

Viaan B.

Viaan builds Efficienco's calculators and edits its practical guides. The published methods, worked examples and automated engine tests let readers check how each estimate is produced.

Editorial approach

Calculator methods, assumptions, source links, limitations, tests and review dates are published so readers can judge an estimate in context. See the Efficienco methodology for the site-wide standard.

Calculators maintained

Home Addition Cost CalculatorReviewed November 8, 2026Paint CalculatorReviewed November 8, 2026Roof Pitch CalculatorReviewed November 8, 2026Bitumen CalculatorReviewed November 8, 2026Brick CalculatorReviewed November 8, 2026Building Material CalculatorReviewed November 8, 2026Concrete Block CalculatorReviewed November 8, 2026Concrete CalculatorReviewed November 8, 2026Crushed Stone & Stone Tonnage CalculatorReviewed November 8, 2026Drywall CalculatorReviewed November 8, 2026Linear Feet CalculatorReviewed November 8, 2026Paver Base CalculatorReviewed November 8, 2026Rebar CalculatorReviewed November 8, 2026Square Footage CalculatorReviewed November 8, 2026HVAC Duct CalculatorReviewed November 8, 2026Line Pipe Weight CalculatorReviewed November 8, 2026Recessed Lighting CalculatorReviewed November 8, 2026

Guides written

When Square Footage Fails to Predict System SizeUpdated October 29, 2026Drywall Sheet Sizes and Layout: 4×8 vs. 4×12, Openings and WasteUpdated October 11, 2026How to Estimate Building Materials: Measurements to Purchase QuantitiesUpdated September 11, 2026Recessed Lighting Layout: Spacing, Lumens and Beam CoverageUpdated September 11, 2026Build Up vs. Build Out: Home Addition Costs in 2026Updated October 29, 2026CMU Block Sizes: Nominal vs. Actual DimensionsUpdated September 10, 2026How Much Mortar and Core Fill Do I Need? Methods and ExamplesUpdated September 10, 2026HVAC Trunk, Plenum and Return Duct SizingUpdated September 10, 2026Room Addition Cost in 2026: Prices by Room TypeUpdated November 5, 2026How Many Concrete Blocks Do I Need? Wall Formula and ExamplesUpdated August 30, 2026How Much Does a Home Addition Cost in 2026? Prices by Size and TypeUpdated October 29, 2026How to Size HVAC Ducts: CFM, Velocity, and Friction RateUpdated August 30, 2026

Contact

Report a page-specific issue through its report link, visit Report a problem, or email viaan@efficienco.com.