---
product_id: 63878322
title: "Air Duct Sizing Calculator"
brand: "hvaccharts"
price: "€ 31.38"
currency: EUR
in_stock: true
url: https://www.desertcart.at/products/63878322-air-duct-sizing-calculator
store_origin: AT
region: Austria
---

# Precision sizing scales Equal friction & velocity methods Durable, water-resistant build Air Duct Sizing Calculator

**Brand:** hvaccharts
**Price:** € 31.38
**Availability:** ✅ In Stock

## Summary

> 📏 Master airflow like a pro—size ducts with confidence and style!

## Quick Answers

- **What is this?** Air Duct Sizing Calculator by hvaccharts
- **How much does it cost?** € 31.38 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/63878322-air-duct-sizing-calculator)

## Best For

- hvaccharts enthusiasts

## Why This Product

- Trusted hvaccharts brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted by HVAC Pros:** Ranked #2,384 in HVAC tools with a stellar 4.6-star rating from 944 users—join the community that demands precision and reliability.
- • **Built to Last On-Site:** Constructed from thick, water-resistant paper stock with reinforced edges and rivets—ready for the toughest job environments.
- • **Dual-Sided Efficiency:** Front and back scales plus charts provide instant access to pressure drops, equivalent feet, and HVAC formulas—no more flipping through manuals.
- • **Compact Yet Comprehensive:** Measuring just 4" x 8.5", this tool fits perfectly in your toolkit while delivering extensive duct sizing data.
- • **Precision at Your Fingertips:** Handheld sliding calculator with detailed scales for friction, velocity, duct size, weight, and surface area—engineered for flawless HVAC design.

## Overview

The Air Duct Sizing Calculator is a compact, handheld sliding tool designed for HVAC professionals to size supply and return ducts using equal friction and velocity reduction methods. Featuring dual-sided scales and charts for friction, velocity, duct dimensions, weight, surface area, and pressure drops, it streamlines complex calculations on-site. Built from durable, water-resistant materials with reinforced edges, it measures 4" by 8.5" and is highly rated by industry users for precision and reliability.

## Description

The Duct Sizing Calculator is a hand held sliding calculator used for sizing supply and return duct systems using the equal friction, or velocity reduction design method. Front of calculator includes scales for friction, velocity, round duct size, weight per linear foot of round duct, surface area in square feet per lineal foot of round duct, rectangular equivalents of round duct sizes, weight per linear foot of rectangular duct and surface area in square feet per linear foot of Rectangular duct. Back of calculator has equivalent feet of straight duct for commonly used fittings, corrected pressure drop chart, and many HVAC formulas. Pull out slide has recommended duct velocities, recommended gauges for sheet metal, and much more. The photo shows both sides of the tool. This slide is made of thick durable water resistant paper stock with glued edges and corner rivets. Tool measures 4 inches high and 8.5 inches wide.

## Features

- Air Duct Calculator
- Equal Friction Method
- Duct Sizing

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B006XIQ7DM |
| Best Sellers Rank | #82,415 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2,384 in HVAC |
| Brand | HVACCHARTS |
| Calculator Type | Air Duct Sizing |
| Customer Reviews | 4.6 4.6 out of 5 stars (944) |
| Display Type | Physical |
| Enclosure Material | Other |
| Item Dimensions L x W | 4"L x 8.5"W |
| Manufacturer | DEFLECTAIR |
| Mfr Part Number | 9W-7LPQ-JTV2 |
| Model Name | Calculatrice de taille de conduit d'air |
| Model Number | 9W-7LPQ-JTV2 |
| Power Source | Battery Powered |
| Screen Size | 4 Inches |
| UPC | 683405356684 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** HVACCHARTS
- **Calculator Type:** Air Duct Sizing
- **Model Name:** Calculatrice de taille de conduit d'air
- **Power Source:** Battery Powered
- **Screen Size:** 4 Inches

## Images

![Air Duct Sizing Calculator - Image 1](https://m.media-amazon.com/images/I/915Uh0HFT8L.jpg)

## Questions & Answers

**Q: Does the problem with sticker placement still exist?**
A: No.  Product identification stickers are easy peel removable labels.  Labels can be removed with little effort.

**Q: Would this be the appropriate calculator for flex ducting? It says round but I don't know if that's metal or flex.**
A: This calculator is not for flex ducting.  Flex ducting has a different friction loss and varies by manufacturer so there is no universal calculator that works for all flex ducting.

## Frequently Bought Together

- Air Duct Sizing Calculator
- REVISED AND UPDATED! HVAC Tables, Equations & Rules of Thumb Quick-Card
- Trane TD1 Ductulator with Sleeve, Duct Sizing Calculator

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.at/products/63878322-air-duct-sizing-calculator](https://www.desertcart.at/products/63878322-air-duct-sizing-calculator)

---

*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-07-14*