Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
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Square Duct Calculators of 2025
Explore top picks
Best Choice1
SMACNASMACNA Duct System Calculator, METRIC
9.9Exceptional
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Powerful technology We scan thousands of products and stores, analyzing reviews to find what matters most to users like you
Careful review Our team ensures quality, value, and fit based on real user feedback
Trusted insights AI and human analysis guide your decisions, reflecting real user prioritiesReal users impact
Thousands of users trust our site daily
- Based on millions of stores and reviews
- Shoppers influence our rankings
Analyzing top stores
Value for Money2
Builder's BookDuct Calculator by Carrier
9.7Exceptional
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3
TraneTrane TD1 Ductulator with Sleeve, Duct Sizing Calculator
9.6Exceptional
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4
BUILDER'BOOK INC.Ductulator Trane- Duct Sizing Calculator, English & Metric Units
9.5Excellent
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5
GenericDuctulator Trane - Duct Sizing Calculator, English & Metric Units
9.4Excellent
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See Today’s Deals & Prices
6
LNEETrane Calculator Kit - (1) Trane Ductulator for Metal Duct and (1) R-410A Charging Calculator
9.1Excellent
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7
GenericAir Duct Calculator/Ductulator with Sleeve
8.8Very Good
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8
datalizerDatalizer Air Duct Calculator - Slide Rule, Blue, 4" x 8.5" Plastic Engineering/Scientific Calculator
8.5Good
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9
TraneDuctulator Trane- Duct Sizing Calculator, English & Metric Units
8.4Good
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10
HVAC ChartsHVAC Chart 3 Pack - R-22 & R-410a Superheat/Subcooling Calculators and Duct Calculator
8.3Good
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