HVAC Math and Measurement Practice Test

Measurements and units are 8% of the NATE Ready-to-Work exam and part of Tools on the Support Technician and Core exams. Practice the arithmetic technicians use on every job.

Take the timed NATE Ready-to-Work mock exam

50 questions on the 90-minute clock, weighted like NATE’s Ready-to-Work outline, with a score for every area and an explanation for every option.

Or try the free measurements drill
  • 18 original measurements questions, every option explained
  • Tested on: NATE Core, NATE Ready-to-Work, NATE HVAC Support Technician
Free sample · Question 1 of 3Measurements

A technician needs three pieces of tubing: 2 ft 6 in, 3 ft 9 in and 1 ft 3 in. What is the total length?

Choose the best answer

What our measurements questions cover

  • Reading a tape measure in sixteenths and comparing fractions
  • Area of rectangles and circles, perimeter and room volume
  • Unit conversions: inches and feet, square inches and square feet, millimeters, °F and °C, watts and Btu/h
  • Airflow: CFM from area and velocity, and airflow per ton
  • Scale drawings and pressure units such as inches of water column
Line drawing of a tape measure, a folding ruler, a calculator and a rectangular duct section with dimension arrows

This list is our own summary, written for practice. NATE publishes the full topic lists in its Knowledge Areas of Technician Expertise (KATEs).

Drill measurements, then sit the full NATE Ready-to-Work exam

Take the timed NATE Ready-to-Work mock exam

50 questions on the 90-minute clock, weighted like NATE’s Ready-to-Work outline, with a score for every area and an explanation for every option.

Or try the free measurements drill

Ideas the questions test most

  1. One square foot is 144 square inches.
  2. Area of a circle is π × radius squared.
  3. CFM = area in square feet × velocity in feet per minute.
  4. °F = °C × 1.8 + 32.
  5. At a 1/4-inch scale, each inch on the drawing is 4 feet.

Start the free measurements drill · NATE Core practice test · NATE Ready-to-Work practice test · NATE HVAC Support Technician practice test

Common questions

What math is on the NATE Ready-to-Work exam?

The KATE lists area, volume and using rulers under Measurements/Units, which is 8% of the exam. Our drill adds the conversions technicians use daily.

Can I use a calculator on NATE exams?

NATE’s live online proctoring rules allow the calculator built into the exam software and not a handheld calculator. Ask your testing organization what it allows for in-person exams.

Take the timed NATE Ready-to-Work mock exam

50 questions on the 90-minute clock, weighted like NATE’s Ready-to-Work outline, with a score for every area and an explanation for every option.

Or try the free measurements drill

More HVAC topics

Exam format and outline checked November 2026 on natex.org: NATE: Ready-to-Work and HVAC Support Technician certificates · NATE Ready-to-Work KATE (PDF) · NATE HVAC Support Technician KATE (PDF) · NATE Core Exam KATE (PDF) · NATE: Frequently asked questions. NATE has not announced a change to this outline.

NATE is a mark of North American Technician Excellence, Inc. Game Assessment Prep is an independent practice site, not affiliated with or endorsed by NATE. Every question is original; none is taken from NATE exams, NATE study guides or another prep provider.