1 kg = 1,000 g
Quick rule: × 1,000
Good to know
1 kg = 1,000 g Unit Conversion Cheatsheet
Cambridge IGCSE Chemistry (0620) unit conversions (2026)
Lab volume + concentration conversions that appear across quantitative chemistry — organised for quick reference and active recall practice.
Cambridge IGCSE Chemistry 0620 2026 syllabus Free PDF + CSV
Our unit conversion cheatsheets are free to download — save this one as PDF for offline revision.
Aligned with the latest 2026 syllabus and board specifications. This sheet is prepared to match your exam board’s official specifications for the 2026 exam series.
Chemistry conversions for titrations, solutions and gases
The most common Chemistry conversion errors are cm³ vs dm³ and concentration units. Use this sheet to standardise units before calculating moles, concentration, or gas volumes.
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Titration-ready units
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cm³ ↔ dm³ clarity
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Free PDF download
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Free CSV download
Summary table (quick conversions)
Use this for fast lookups. Click a category to jump to the detailed notes and tips.
| Priority | Category | Conversion | Quick rule |
|---|---|---|---|
| Good to know | Mass (common) | 1 kg = 1,000 g | × 1,000 |
| Must know | Mass (common) | 1 g = 1,000 mg | × 1,000 |
| Good to know | Mass (common) | 1 mg = 1,000 μg | × 1,000 |
| Must know | Temperature | K = °C + 273.15 | + 273.15 |
| Must know | Volume (lab) | 1 dm³ = 1,000 cm³ | × 1,000 |
| Must know | Volume (lab) | 1 cm³ = 1 mL | — |
| Must know | Volume (lab) | 1 L = 1 dm³ | — |
| Must know | Volume (lab) | cm³ → dm³: divide by 1,000 | — |
| Must know | Concentration | mol/dm³ = mol ÷ dm³ | — |
| Good to know | Concentration | g/dm³ = g ÷ dm³ | — |
| Good to know | Concentration | 1 g/dm³ = 1 mg/cm³ | — |
| Good to know | Concentration | ppm in water ≈ mg/L | — |
| Must know | Amount of substance | 1 mol = 1,000 mmol | × 1,000 |
| Must know | Gas volumes (RTP) | 1 mol gas ≈ 24 dm³ at RTP | — |
| Good to know | Gas volumes (RTP) | 24 dm³ = 24,000 cm³ | × 1,000 |
| Good to know | Pressure | 1 kPa = 1,000 Pa | × 1,000 |
| Good to know | Pressure | 1 atm ≈ 101 kPa | — |
| Must know | Energy | 1 kJ = 1,000 J | × 1,000 |
| Good to know | Energy | 1 MJ = 1,000,000 J | × 1,000,000 |
Mass (common)
1 g = 1,000 mg
Quick rule: × 1,000
Must know
1 g = 1,000 mg 1 mg = 1,000 μg
Quick rule: × 1,000
Good to know
1 mg = 1,000 μg Temperature
K = °C + 273.15
Quick rule: + 273.15
Must know
K = °C + 273.15 Volume (lab)
cm³ and dm³ conversions are essential for titrations and concentration.
Most concentration formulas use dm³. If the question gives cm³, convert first (divide by 1000).
1 dm³ = 1,000 cm³
Quick rule: × 1,000
Must know
1 dm³ = 1,000 cm³ 1 cm³ = 1 mL
So 1,000 cm³ = 1 L.
Must know
1 cm³ = 1 mL 1 L = 1 dm³
In chemistry, dm³ is commonly used in calculations.
Must know
1 L = 1 dm³ cm³ → dm³: divide by 1,000
Example: 25.0 cm³ = 0.0250 dm³.
Must know
cm³ → dm³: divide by 1,000 Concentration
Key for solutions, titrations, and quantitative chemistry.
Make sure your units match (mol with mol/dm³, g with g/dm³), and convert volume to dm³ before calculating.
mol/dm³ = mol ÷ dm³
If volume is in cm³, convert to dm³ first.
Must know
mol/dm³ = mol ÷ dm³ g/dm³ = g ÷ dm³
Often used for solutions in IGCSE Chemistry.
Good to know
g/dm³ = g ÷ dm³ 1 g/dm³ = 1 mg/cm³
Because 1 dm³ = 1000 cm³ and 1 g = 1000 mg.
Good to know
1 g/dm³ = 1 mg/cm³ ppm in water ≈ mg/L
A common exam approximation for dilute aqueous solutions.
Good to know
ppm in water ≈ mg/L Amount of substance
1 mol = 1,000 mmol
Quick rule: × 1,000
Must know
1 mol = 1,000 mmol Gas volumes (RTP)
Used in stoichiometry when gases are measured at room temperature and pressure.
At RTP, the molar gas volume is approximately 24 dm³ per mole.
1 mol gas ≈ 24 dm³ at RTP
Use for molar volume calculations (RTP).
Must know
1 mol gas ≈ 24 dm³ at RTP 24 dm³ = 24,000 cm³
Quick rule: × 1,000 • Useful when gas volumes are given in cm³.
Good to know
24 dm³ = 24,000 cm³ Pressure
1 kPa = 1,000 Pa
Quick rule: × 1,000
Good to know
1 kPa = 1,000 Pa 1 atm ≈ 101 kPa
Approximation sometimes used in chemistry contexts.
Good to know
1 atm ≈ 101 kPa Energy
1 kJ = 1,000 J
Quick rule: × 1,000
Must know
1 kJ = 1,000 J 1 MJ = 1,000,000 J
Quick rule: × 1,000,000
Good to know
1 MJ = 1,000,000 J How to Use This Unit Conversion Cheatsheet
Boost your Cambridge exam confidence with these proven study strategies from our tutoring experts.
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Convert volume first (cm³ → dm³)
Most formulas use dm³. If the question gives cm³, divide by 1000 before calculating concentration or moles.
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Check concentration units
Use mol with mol/dm³ and g with g/dm³. Unit mismatches are a common cause of incorrect answers.
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Kelvin vs Celsius
When a formula uses temperature in kelvin, convert with K = °C + 273.15 (and reverse by subtracting).
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Molar gas volume at RTP
At RTP, 1 mol of gas occupies about 24 dm³. Convert to cm³ if the question gives gas volumes in cm³.
Unit Conversion Cheatsheet FAQ
Quick answers about this free PDF and how to use it for exam revision and active recall.
Which unit conversions are most important for Cambridge IGCSE Chemistry (0620) in 2026?
The most common conversions are dm³ ↔ cm³ (for solution volumes), concentration units (mol/dm³ and g/dm³), ppm for dilute solutions, mol ↔ mmol, energy (kJ ↔ J), and temperature (°C ↔ K).
How do I convert cm³ to dm³ in Chemistry?
Divide by 1000. For example, 25.0 cm³ = 0.0250 dm³.
What is molar gas volume at RTP?
At room temperature and pressure (RTP), 1 mol of gas occupies approximately 24 dm³.
How do I interpret ppm in water questions?
A common IGCSE approximation is ppm ≈ mg/L for dilute aqueous solutions, which helps you convert between representations quickly.
Can I download this as PDF and CSV?
Yes. Download PDF for printing/offline revision, or download CSV to turn conversions into flashcards and quizzes.
Free downloads
Use the PDF for printing/offline revision, and the CSV for building flashcards or quick active recall quizzes.
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Aligned to the unit conversions that appear most often in Cambridge IGCSE Chemistry (0620) quantitative questions for the 2026 syllabus.
Tip: convert cm³ → dm³ early, and keep units on every line.