Learn the 3-Step Method
1The conversion number is 1000.
1000 g = 1 kg — three places to slide.
2kg → g: multiply.
Smaller unit → more of them: 2.5 kg = 2500 g.
3g → kg: divide.
Bigger unit → fewer: 750 g = 0.75 kg.
Worked Example
A recipe needs 1.2 kg of flour. Dad has a 500 g bag and a 800 g bag. Is that enough?
Watch Out! Common Mistakes
Wrong! ×1000 is three places: 2500 g.
Wrong! Convert first: 1200 g + 500 g = 1700 g (1.7 kg).
Sense-check! Grams are smaller, so you need MORE: 3 kg = 3000 g.
⬇ Cheat Sheet
- 1000 g = 1 kg.
- kg → g: × 1000 (3 places left).
- g → kg: ÷ 1000 (3 places right).
- Same units before adding or comparing.
📖 Continue Your Journey
Quick summary
- 1000 g = 1 kg is the only fact you need.
- kg to g: multiply by 1000; g to kg: divide by 1000.
- Convert to the same unit before adding: 1.2 kg + 500 g = 1700 g.
- Sense-check the direction — grams should give a bigger number than kilograms.
Frequently asked questions
How do you convert kilograms to grams?
Multiply by 1000 — slide the digits three places left. 2.5 kg = 2500 g.
How do you add masses in different units?
Convert them to the same unit first. 1.2 kg + 500 g becomes 1200 g + 500 g = 1700 g (or 1.7 kg).
What's a quick sense-check for mass conversions?
Grams are small, so a mass in grams should be a bigger number than the same mass in kilograms: 2500 g = 2.5 kg.
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