1 kV = 1,000 V
Quick rule: × 1,000 • If you have kV but need V, multiply by 1,000.
Good to know
1 kV = 1,000 V Unit Conversion Cheatsheet
Cambridge IGCSE Physics (0625) unit conversions (2026)
SI prefixes + the derived-unit conversions that come up again and again in exam calculations — built for speed and active recall.
Cambridge IGCSE Physics 0625 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.
Physics unit conversions that save marks in Cambridge IGCSE
Most Physics mistakes are unit mistakes: prefixes, kPa vs Pa, kWh vs J, mA vs A. Use this sheet to convert into base SI units before applying equations.
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SI-first, exam-ready
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Prefixes made simple
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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 | Electricity & unit sizes (common) | 1 kV = 1,000 V | × 1,000 |
| Good to know | Electricity & unit sizes (common) | 1 V = 1,000 mV | × 1,000 |
| Must know | Electricity & unit sizes (common) | 1 A = 1,000 mA | × 1,000 |
| Good to know | Electricity & unit sizes (common) | 1 A = 1,000,000 μA | × 1,000,000 |
| Must know | Electricity & unit sizes (common) | 1 kΩ = 1,000 Ω | × 1,000 |
| Good to know | Electricity & unit sizes (common) | 1 MΩ = 1,000,000 Ω | × 1,000,000 |
| Good to know | Waves (frequency) | 1 kHz = 1,000 Hz | × 1,000 |
| Good to know | Waves (frequency) | 1 MHz = 1,000,000 Hz | × 1,000,000 |
| Must know | Length (metric) | 1 m = 100 cm | × 100 |
| Must know | Length (metric) | 1 m = 1,000 mm | × 1,000 |
| Good to know | Area (metric) | 1 m² = 10,000 cm² | × 10,000 |
| Good to know | Volume & capacity (metric) | 1 m³ = 1,000,000 cm³ | × 1,000,000 |
| Must know | Volume & capacity (metric) | 1 cm³ = 1 mL | — |
| Must know | Volume & capacity (metric) | 1 L = 1,000 mL | × 1,000 |
| Good to know | Volume & capacity (metric) | 1 m³ = 1,000 L | × 1,000 |
| Must know | Mass (metric) | 1 kg = 1,000 g | × 1,000 |
| Must know | Time | 1 min = 60 s | × 60 |
| Good to know | Time | 1 h = 3,600 s | × 3600 |
| Must know | Speed | 1 m/s = 3.6 km/h | × 3.6 |
| Must know | Density | 1 g/cm³ = 1000 kg/m³ | × 1000 |
| Good to know | Force | 1 kN = 1,000 N | × 1,000 |
| Must know | Pressure | 1 kPa = 1,000 Pa | × 1,000 |
| Good to know | Pressure | 1 MPa = 1,000,000 Pa | × 1,000,000 |
| Must know | Energy | 1 kJ = 1,000 J | × 1,000 |
| Good to know | Energy | 1 MJ = 1,000,000 J | × 1,000,000 |
| Must know | Energy | 1 kWh = 3,600,000 J | × 3,600,000 |
| Good to know | Power | 1 kW = 1,000 W | × 1,000 |
| Good to know | Charge | 1 C = 1,000 mC | × 1,000 |
| Good to know | Charge | 1 C = 1,000,000 μC | × 1,000,000 |
| Must know | Temperature | K = °C + 273.15 | + 273.15 |
Electricity & unit sizes (common)
The #1 source of lost marks: mixing up mA, A, kΩ and Ω.
Convert electrical quantities into the unit used in the equation before substituting.
1 V = 1,000 mV
Quick rule: × 1,000
Good to know
1 V = 1,000 mV 1 A = 1,000 mA
Quick rule: × 1,000
Must know
1 A = 1,000 mA 1 A = 1,000,000 μA
Quick rule: × 1,000,000
Good to know
1 A = 1,000,000 μA 1 kΩ = 1,000 Ω
Quick rule: × 1,000
Must know
1 kΩ = 1,000 Ω 1 MΩ = 1,000,000 Ω
Quick rule: × 1,000,000
Good to know
1 MΩ = 1,000,000 Ω Waves (frequency)
Frequency units often appear on wave graphs and in questions.
Convert kHz/MHz to Hz when needed.
1 kHz = 1,000 Hz
Quick rule: × 1,000
Good to know
1 kHz = 1,000 Hz 1 MHz = 1,000,000 Hz
Quick rule: × 1,000,000
Good to know
1 MHz = 1,000,000 Hz Length (metric)
1 m = 100 cm
Quick rule: × 100
Must know
1 m = 100 cm 1 m = 1,000 mm
Quick rule: × 1,000
Must know
1 m = 1,000 mm Area (metric)
1 m² = 10,000 cm²
Quick rule: × 10,000
Good to know
1 m² = 10,000 cm² Volume & capacity (metric)
1 m³ = 1,000,000 cm³
Quick rule: × 1,000,000
Good to know
1 m³ = 1,000,000 cm³ 1 cm³ = 1 mL
Useful in density + displacement questions.
Must know
1 cm³ = 1 mL 1 L = 1,000 mL
Quick rule: × 1,000
Must know
1 L = 1,000 mL 1 m³ = 1,000 L
Quick rule: × 1,000
Good to know
1 m³ = 1,000 L Mass (metric)
1 kg = 1,000 g
Quick rule: × 1,000
Must know
1 kg = 1,000 g Time
1 min = 60 s
Quick rule: × 60
Must know
1 min = 60 s 1 h = 3,600 s
Quick rule: × 3600
Good to know
1 h = 3,600 s Speed
1 m/s = 3.6 km/h
Quick rule: × 3.6 • To convert km/h → m/s, divide by 3.6.
Must know
1 m/s = 3.6 km/h Density
1 g/cm³ = 1000 kg/m³
Quick rule: × 1000 • Common when switching between lab units and base units.
Must know
1 g/cm³ = 1000 kg/m³ Force
1 kN = 1,000 N
Quick rule: × 1,000
Good to know
1 kN = 1,000 N Pressure
Pa, kPa and MPa appear often in graphs and calculations.
Always match the units given on the axis (or in the question) before calculating.
1 kPa = 1,000 Pa
Quick rule: × 1,000
Must know
1 kPa = 1,000 Pa 1 MPa = 1,000,000 Pa
Quick rule: × 1,000,000
Good to know
1 MPa = 1,000,000 Pa Energy
Energy unit conversions show up in electricity and efficiency questions.
kWh is energy; convert to joules when using equations in base units.
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 1 kWh = 3,600,000 J
Quick rule: × 3,600,000 • Because 1 kW = 1000 J/s and 1 h = 3600 s.
Must know
1 kWh = 3,600,000 J Power
1 kW = 1,000 W
Quick rule: × 1,000
Good to know
1 kW = 1,000 W Charge
1 C = 1,000 mC
Quick rule: × 1,000
Good to know
1 C = 1,000 mC 1 C = 1,000,000 μC
Quick rule: × 1,000,000
Good to know
1 C = 1,000,000 μC Temperature
K = °C + 273.15
Quick rule: + 273.15
Must know
K = °C + 273.15 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 to base units first
Before using equations, convert everything to base SI units (m, kg, s, A). That’s the fastest way to avoid prefix mistakes.
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Match the axis units
In graphs, always check units on axes (kPa vs Pa, ms vs s). Convert before calculating gradients or areas.
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kWh is energy
kWh is an energy unit used in electricity bills. Convert to joules for Physics equations: 1 kWh = 3.6 × 10⁶ J.
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Write units every line
Treat units like algebra. If units cancel correctly, the final unit usually reveals whether your conversion is right.
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 Physics (0625) in 2026?
The highest-frequency conversions involve SI prefixes (k, M, m, μ), pressure (kPa ↔ Pa), energy (kWh ↔ J), speed (m/s ↔ km/h), density (g/cm³ ↔ kg/m³), and electrical units (mA ↔ A, kΩ ↔ Ω, kHz ↔ Hz).
Should I always convert to base SI units in Physics calculations?
Yes — it’s the safest approach. Convert to base units (m, kg, s, A) before substituting into equations, especially when prefixes are present.
How do I avoid mistakes with kPa and Pa?
Remember 1 kPa = 1000 Pa. If an equation expects Pa but you have kPa, multiply by 1000 first.
Why does 1 kWh equal 3.6 × 10⁶ J?
Because 1 kW = 1000 J/s and 1 hour = 3600 s, so energy = power × time = 1000 × 3600 = 3,600,000 J.
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 Physics (0625) calculations for the 2026 syllabus.
Tip: convert prefixes and match axis units before using equations.