Grade 3 Measurement Worksheets — Metric Units PDF
Third grade widens measurement from length alone to the full everyday metric set: millimeters and centimeters, centimeters and meters, grams and kilograms, milliliters and liters. Each pair works the same way — multiply by ten, a hundred or a thousand going down to the smaller unit, divide by the same amount going up. Eight sub-skills are offered at this grade and the page opens on Length Units, where the level control steps from Convert to a smaller unit, to Convert to a larger unit, to Both directions. Mass, Capacity and Units of Time follow the same three steps in their own families, and Comparing Measurements is the separate sheet for measurements written in different units.
Choose the difficulty, dial the number of questions, and tick the answer key box before printing. Every sheet is rebuilt from the link, so you can hand the same set to a whole class, keep it for revision, or press Shuffle for a completely fresh page at the same level.
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Measurement · Grade 3
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Grade 3 · 2 pages · A4More Grade 3 measurement skills
Each one generates a different kind of question, with its own three levels and answer key.
- Length UnitsChange a length between millimeters, centimeters, meters and kilometers.
- Mass: Grams and KilogramsChange a weight between milligrams, grams and kilograms.
- Capacity: Milliliters and LitersChange an amount of liquid between milliliters and liters.
- Units of TimeChange between seconds, minutes, hours, days and weeks.
- Compound MeasurementsRewrite measurements like 3 m 40 cm using one unit, and back again.
- Comparing MeasurementsDecide which of two measurements is bigger when the units differ.
- Ordering MeasurementsPut three or four measurements in order when the units are mixed.
- Reading Scales and RulersWork out what a ruler, kitchen scale or measuring jug is showing.
What each level generates
Grade 3 length units — the exact skill behind each difficulty setting, straight from the generator.
- Level 1Convert to a smaller unit
- Level 2Convert to a larger unit
- Level 3Both directions
Grade levels follow the progression common to most English-language curricula — not one specific national curriculum. Every level shows exactly what it generates, so you can check the fit with your own program. See the full scope & sequence →
What Grade 3 measurement covers
The headline skill is one-step conversion inside a unit family, with the four everyday relationships: 10 mm = 1 cm, 100 cm = 1 m, 1000 g = 1 kg, 1000 ml = 1 L. A child who knows those four numbers, and knows which direction makes the answer bigger, can handle every question on the first two levels of each conversion sheet. Mass and capacity usually need more attention than length simply because children handle a ruler far more often than a kitchen scale.
The deeper aim is unit sense: knowing that a bag of flour is about 1 kg, a bottle of water about 1 L, a fingernail about 1 cm wide. Estimation is what catches an error before the marking pen does, and it costs nothing to build — ask for a guess before every measurement, then check it. A child who guesses 5 kg for an apple has a gap that no amount of conversion practice will close on its own.
Teaching the two directions cleanly
Write the family on one line before starting: mm → cm → m, each arrow worth ten then a hundred. Moving to a smaller unit means more of them, so the number grows; moving to a larger unit means fewer of them, so the number shrinks. Saying that sentence aloud on the first three questions saves a page of corrections, because almost every mistake at this level is multiplying when the child should have divided.
The Comparing Measurements sheet is worth reaching deliberately, since it is the only one where converting is a means rather than an end. "Which is heavier: 2 kg or 1850 g?" cannot be answered until both sides share a unit, which is exactly the habit that later multi-step problems depend on. Ten to fifteen questions is a sensible session; tick the answer key so a child can self-check a row at a time rather than waiting for the whole page.
Frequently asked questions
▸What metric units are taught in Grade 3?
Millimeters, centimeters and meters for length, grams and kilograms for mass, and milliliters and liters for capacity. These worksheets convert in one step between each pair, and the Comparing Measurements sheet compares two measurements written in different units.
▸How do you convert grams to kilograms?
There are 1000 grams in a kilogram, so divide by 1000 going to kilograms and multiply by 1000 going to grams. 4000 g is 4 kg, and 6 kg is 6000 g. The conversion sheets — Length Units, Mass, Capacity and Units of Time — drill the dividing direction on its own at their second level.
▸Why do children mix up multiplying and dividing in conversions?
Because the rule is memorised without a picture of size. Fixing it takes one question: will the answer be a bigger number or a smaller one? Smaller units always need a bigger number, which is what the first level of each conversion sheet reinforces on every line.
▸Can I make a worksheet with only length, or only mass?
The Compare, Order, Compound Measurements and Reading Scales sheets mix the unit families deliberately, so children must decide which relationship applies rather than switching to autopilot. If you want a single family, choose the Length, Mass, Capacity or Time sub-skill.