To estimate the size of the finished project, measure the width and length of your laptop and add 7cm to each measurement. For example, if your laptop measures 25.5cm x 35.5cm, then the finished case will be 32.5cm x 42.5cm. Finally, add 15.5cm for the closure.
18cm x 29cm x 18cm high
Measure your toaster before you start. If yours is bigger, you will need to allow extra fabric and adjust your template measurements.