Our KS1 Capacity Outdoor Learning Pack is a hands-on, engaging resource designed to help children explore and understand capacity through real-world outdoor activities. Using water play, containers, and natural materials, children learn to compare, measure, and estimate how much different objects can hold. With a focus on millilitres (ml) and litres (l), this pack helps children develop confidence in using standard units while making learning practical, visual, and fun. Ideal for teachers and parents, it supports active learning and builds a strong foundation in understanding volume and capacity.
What Are Volume and Capacity? A KS1 Guide (and How We Measure in ml and l)
Understanding volume and capacity is an important part of KS1 maths. These concepts help children describe how much space something takes up or how much a container can hold. Learning this through practical experiences makes it much easier for children to understand.
What Is Volume?
Volume is the amount of space that an object takes up.
For example:
- A large box has more volume than a small box
- A big rock takes up more space than a small pebble
Volume is about the space inside an object or how much room it uses.
What Is Capacity?
Capacity is the amount of liquid a container can hold.
For example:
- A bottle can hold a certain amount of water
- A bucket has a larger capacity than a cup
Capacity focuses specifically on liquids and containers.
For a clear introduction, visit BBC Bitesize:
https://www.bbc.co.uk/bitesize/topics/zd3cdnb/articles/z4q26v4
What Are Millilitres (ml)?
A millilitre (ml) is a small unit used to measure capacity.
- It is used for small amounts of liquid
- 1000 millilitres = 1 litre
Examples:
- A small cup of juice
- A spoonful of water
- A small container
BBC Bitesize explains measuring in millilitres here:
https://www.bbc.co.uk/bitesize/topics/zd3cdnb/articles/zjv39j6
What Are Litres (l)?
A litre (l) is a larger unit used to measure capacity.
- It is used for larger amounts of liquid
- 1 litre = 1000 millilitres
Examples:
- A bottle of water
- A jug of juice
- A bucket
Learn more on BBC Bitesize:
https://www.bbc.co.uk/bitesize/topics/zd3cdnb/articles/zf4cwmn
How Children Measure Capacity
Children are taught to:
- Compare which container holds more or less
- Estimate and then measure
- Use measuring jugs or containers
- Read scales in ml and l
For example:
- A cup might hold 200 ml
- A bottle might hold 1 litre
Why Children Sometimes Find This Difficult
Children may:
- Confuse volume and capacity
- Struggle to understand the size of units
- Find it hard to visualise how much something holds
This is why practical, hands-on learning is essential.
Why Taking Capacity Learning Outdoors Improves Understanding
Makes Learning Practical
Children can pour, fill, and compare real containers using water or sand.
Helps Visualise Amounts
Seeing liquids fill containers helps children understand capacity more clearly.
Encourages Exploration
Children can test ideas like:
- Which holds more?
- How many small cups fill a large bucket?
Builds Engagement
Outdoor water play is motivating and memorable, helping children stay focused.
Outdoor Capacity Activity Ideas (KS1)
- Fill and compare different containers with water
- Estimate how many cups fill a bucket
- Use measuring jugs to explore ml and litres
- Sort containers by capacity
Why This Supports “Capacity KS1” Learning
Combining clear explanations, trusted BBC Bitesize resources, and practical outdoor activities creates meaningful and engaging learning experiences. This helps children develop confidence and apply their understanding in real-life situations.
