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Energy Conversion Worksheets — Joules to Kilojoules (Free)

Energy is measured in joules, but everyday and food energy is usually kilojoules. These worksheets drill the clean factor 1 kJ = 1000 J so students flip between J and kJ without thinking. The engine uses exact powers of ten, so every answer is exact and verifiable.

Sample problems (new ones below)

Convert 3600 J to kJ → 3.6 kJConvert 3800 J to kJ → 3.8 kJConvert 5000 J to kJ → 5.0 kJConvert 2300 J to kJ → 2.3 kJConvert 3200 J to kJ → 3.2 kJConvert 4600 J to kJ → 4.6 kJConvert 1400 J to kJ → 1.4 kJConvert 2600 J to kJ → 2.6 kJConvert 1600 J to kJ → 1.6 kJConvert 2000 J to kJ → 2.0 kJConvert 200 J to kJ → 0.2 kJConvert 4100 J to kJ → 4.1 kJConvert 2100 J to kJ → 2.1 kJConvert 1000 J to kJ → 1.0 kJConvert 900 J to kJ → 0.9 kJConvert 1100 J to kJ → 1.1 kJConvert 4400 J to kJ → 4.4 kJConvert 3400 J to kJ → 3.4 kJConvert 600 J to kJ → 0.6 kJConvert 4500 J to kJ → 4.5 kJConvert 2400 J to kJ → 2.4 kJConvert 2700 J to kJ → 2.7 kJConvert 1500 J to kJ → 1.5 kJConvert 2200 J to kJ → 2.2 kJ

Worksheet controls

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Physics energy
Name: _______________  ·  Date: _______________
unitfig.com/math-worksheets/physics-energy · free printable
1.Convert 3000 J to kJ
2.Convert 3700 J to kJ
3.Convert 2300 J to kJ
4.Convert 4700 J to kJ
5.Convert 2800 J to kJ
6.Convert 2100 J to kJ
7.Convert 1100 J to kJ
8.Convert 900 J to kJ
9.Convert 3800 J to kJ
10.Convert 3600 J to kJ
11.Convert 4300 J to kJ
12.Convert 5000 J to kJ
13.Convert 4900 J to kJ
14.Convert 3200 J to kJ
15.Convert 400 J to kJ
16.Convert 800 J to kJ
17.Convert 500 J to kJ
18.Convert 700 J to kJ
19.Convert 2400 J to kJ
20.Convert 200 J to kJ
21.Convert 4800 J to kJ
22.Convert 4500 J to kJ
23.Convert 600 J to kJ
24.Convert 1400 J to kJ
Answer Key
1. 3.0 kJ(Divide joules by 1000.)
2. 3.7 kJ(Divide joules by 1000.)
3. 2.3 kJ(Divide joules by 1000.)
4. 4.7 kJ(Divide joules by 1000.)
5. 2.8 kJ(Divide joules by 1000.)
6. 2.1 kJ(Divide joules by 1000.)
7. 1.1 kJ(Divide joules by 1000.)
8. 0.9 kJ(Divide joules by 1000.)
9. 3.8 kJ(Divide joules by 1000.)
10. 3.6 kJ(Divide joules by 1000.)
11. 4.3 kJ(Divide joules by 1000.)
12. 5.0 kJ(Divide joules by 1000.)
13. 4.9 kJ(Divide joules by 1000.)
14. 3.2 kJ(Divide joules by 1000.)
15. 0.4 kJ(Divide joules by 1000.)
16. 0.8 kJ(Divide joules by 1000.)
17. 0.5 kJ(Divide joules by 1000.)
18. 0.7 kJ(Divide joules by 1000.)
19. 2.4 kJ(Divide joules by 1000.)
20. 0.2 kJ(Divide joules by 1000.)
21. 4.8 kJ(Divide joules by 1000.)
22. 4.5 kJ(Divide joules by 1000.)
23. 0.6 kJ(Divide joules by 1000.)
24. 1.4 kJ(Divide joules by 1000.)

Teaching tips for energy

  • •Anchor: 1 kJ = 1000 J. To kJ divide by 1000; to J multiply by 1000. Powers of ten, no decimals to track.
  • •Use prefixes as a ladder: milli < base < kilo. Moving from J (base) to kJ (kilo) is three places left (÷1000).
  • •Estimate: 1 kJ is about the energy to lift a small apple 100 m — a tangible anchor for the scale.

Common mistakes to watch for

✗ Multiplying instead of dividing when going J → kJ.
✓ kJ is the bigger unit name but the smaller number: 2500 J = 2.5 kJ. Divide by 1000 to shrink J into kJ.
✗ Writing the wrong number of zeros.
✓ 1000 has three zeros. 2500 J → 2.5 kJ (move the decimal three places left). The engine’s exact powers of ten make this checkable.

Check your answers with the tools

Browse all converters →Quick conversion charts →

Grade & standards alignment

These energy worksheets target the Grades 6–9 band of the Common Core State Standards for Mathematics (CCSSM). The relevant CCSS math domains are:

Physical Science — Energy & Work

Source: Common Core State Standards for Mathematics (2010). National Governors Association Center for Best Practices (NGA Center) & Council of Chief State School Officers (CCSSO). Retrieved 2026-08-11 from https://www.corestandards.org/Math/.

The CCSSM are public, open-license standards; this alignment is provided for planning and is not an official endorsement by the standards authors.

How these worksheets are built (accuracy & trust)

  • •Problems are generated by a deterministic engine using exact integer and rational arithmetic — answers are reduced to lowest terms and never rely on floating-point rounding, so they match the matching UnitFig converter.
  • •Grade presets follow the CCSSM progression above; pick a grade to get age-appropriate number ranges.
  • •Content is reviewed for accuracy and refreshed each year (2026). Worksheet copy and examples are original and written for classroom use.

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UnitFig collects no personal information from children or any visitor. Worksheets run entirely in the browser: no account, no name or email, and student answers never leave the device. We follow a COPPA-aligned, zero-collection design so teachers and parents can use these sheets without a signup wall or privacy concern. See our Privacy Policy.

Frequently Asked Questions

How many joules in a kilojoule?

Exactly 1000. 1 kJ = 1000 J, so converting J to kJ divides by 1000 and kJ to J multiplies by 1000.

What grade is energy conversion taught?

Energy units appear in grade 6–9 physical science, alongside work and power.

Are answers exact?

Yes. The factor is an exact power of ten, so every J↔kJ conversion is exact with no rounding.

More worksheets

➕ Addition➖ Subtraction✖️ Multiplication➗ Division⅔ Fractions🔟 Decimals± Integers🧮 Order of Operations📏 Unit Conversion📐 Geometry Practice🚀 Speed⚡ Force🌡️ Temperature🧪 Moles⚗️ Concentration

Last Updated 2026 | Problems are algorithm-generated with the exact NIST/SI constants used by UnitFig converters. Answers are computed programmatically and can be verified with the matching converter.