Blood pressure is a measure of the force that your heart uses to pump blood around the body.
Knowing whether your blood pressure is "normal", "high" or "low" can be key to looking after your health and identifying any illnesses you may be at risk of developing.
For example, high blood pressure is thought to increase your risk of heart attack, heart failure, kidney disease, stroke and dementia.
Thankfully, with at-home blood pressure monitors now available from most chemists, it's never been easier to keep track of your own blood pressure.
However, the numbers on the monitors can be a little confusing if you've not checked your own blood pressure before.
To help, the team at NHS Choices have created a tool to help you figure out what your blood pressure reading means.
As a general guide, the ideal blood pressure for a young healthy adult is 120/80 or lower. However, it’s also possible to have abnormally low blood pressure.
Enter your blood pressure figures below and the tool will tell you where you sit on the scale and what treatment you may need.
While the tool is a useful guide, remember it's important to visit your GP for accurate advice on blood pressure that's tailored to you.