To convert units on the TEAS, multiply by conversion factors written as fractions equal to 1, with the unit you want to cancel on the bottom. Metric prefixes move the decimal point; US units need memorized factors. Square and cubic units use the factor two or three times. This free lab builds each chain and cancels units visibly.
Use dimensional analysis. Write the starting amount, then multiply by a fraction that equals 1, such as 12 in / 1 ft, with the unit you want to get rid of on the bottom. Units that appear on the top and the bottom cancel. Keep adding factors until only the unit you want is left.
Example: 3 miles to inches. 3 mi × (5,280 ft / 1 mi) × (12 in / 1 ft) = 190,080 in. If your chain gives a tiny number for a smaller unit, a factor is upside down.
ATI’s help page lists metric and imperial conversions of length, weight and volume among the math to know. We found no ATI statement that a conversion chart is provided during the exam, so learn the common factors. When a question gives you a factor, use exactly that one.
Metric units step by powers of ten: kilo (1,000), hecto (100), deka (10), the base unit, deci (1/10), centi (1/100) and milli (1/1,000). Count the steps between prefixes and move the decimal point that many places: right when you change to a smaller unit, left when you change to a larger unit. 0.45 kg is 450 g, and 2,350 mL is 2.35 L.
A square unit is a length times a length, so the length factor is used twice. 1 yd = 3 ft, so 1 yd² = 3 ft × 3 ft = 9 ft², not 3 ft². Cubic units use the factor three times: 1 ft³ = 12 × 12 × 12 = 1,728 in³.
No. An ounce (oz) measures weight, and a fluid ounce (fl oz) measures volume. Use 16 oz = 1 lb for weight and 8 fl oz = 1 cup for volume. US and UK (Imperial) gallons are also different sizes; this lab uses US units throughout.
Sometimes a question states the factor to use, such as 1 kg = 2.2 lb, and then you should use exactly that factor. We found no ATI statement that a conversion chart is provided, so memorize the common metric prefixes and US customary factors.
Metric prefixes (kilo, centi, milli), 12 in = 1 ft, 3 ft = 1 yd, 5,280 ft = 1 mi, 16 oz = 1 lb, 8 fl oz = 1 cup, 2 cups = 1 pt, 2 pt = 1 qt, 4 qt = 1 gal, 3 tsp = 1 tbsp, and 1 in = 2.54 cm. Know that 1 kg is about 2.2 lb.
Put the unit you want to cancel on the bottom. To change feet to inches, multiply by 12 in / 1 ft so feet cancel. Then check the size: changing to a smaller unit should give a bigger number.
9. A square yard is 3 ft by 3 ft, so 1 yd² = 3 × 3 = 9 ft².
Yes. ATI says a basic on-screen calculator is built into the exam and is available on every question in every section. It adds, subtracts, multiplies and divides, and has percent, square root, decimal point, backspace and memory keys. It is not a scientific or graphing calculator, and personal, phone and watch calculators are not allowed.
Facts checked 2026-10-25. Practice items and data in this lab are original and invented; they are not real TEAS questions.
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