Numbers and Calculations in Everyday Life- Part 1

We deal with numbers on a daily basis in areas like finance, work, study and health. Mathematics is an important subject throughout our education. Number start to play an important role in our life from the day we are born. Our dates of birth, weight and height at birth are all important records of our life. Here you will find useful numbers and calculations all in one place. Some are trivial but some can be life changing. In Part 1, you will find important numbers for our health.


Our genes, lifestyles and eating habits determine our life expectancy. Used correctly, life expectancy and longevity can be powerful planning tools that can help provide a truer picture of what you have to do to make your retirement years both comfortable and secure. We can see that people are living longer – which puts even greater emphasis on planning carefully for your retirement. According to the data on website of World Health Organization (WHO), 71.4 years was the average life expectancy at birth of the global population in 2015.

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Blood Pressure

Knowing both your systolic and diastolic blood pressure numbers is important and could save your life.

What Does the Systolic Blood Pressure Number Mean?
When your heart beats, it contracts and pushes blood through the arteries to the rest of the body. This force creates pressure on the arteries. This is called systolic blood pressure. A normal systolic blood pressure is below 120. A systolic blood pressure of 120 to 139 means you have prehypertension, or borderline high blood pressure. Even people with prehypertension are at a higher risk of developing heart disease. A systolic blood pressure number of 140 or higher is considered to be hypertension, or high blood pressure.

What Does the Diastolic Blood Pressure Number Mean?
The diastolic blood pressure number or the bottom number indicates the pressure in the arteries when the heart rests between beats. This is the time when the heart fills with blood and receives oxygen. A normal diastolic blood pressure number is less than 80.A diastolic blood pressure between 80 and 89 indicates prehypertension. A diastolic blood pressure number of 90 or higher is considered to be hypertension or high blood pressure.

Before you take your blood pressure, it’s recommended to avoid caffeine, cigarettes, and exercise for at least 30 minutes prior to the test. When you monitor your blood pressure at home on a regular basis, take it at the same time of day so the readings are more consistent. Then, take several readings about one minute apart. Be sure to write down these readings in a journal.

Take your blood pressure journal with you to your doctor’s office so you can talk about any changes in your blood pressure numbers. Your doctor will decide if you need blood pressure medications. High blood pressure is often called the “silent killer.” The first symptom of untreated high blood pressure may be a heart attack, stroke, or kidney damage.

300x250 HealthTap

Adequate number of hours of sleep

Adults need 7 – 9 hours of sleeps per day to stay healthy. Lack of sleep makes you hungry, increases risks of diseases and may cause early death.

Weight, height and Body Mass Index (BMI)

BMI provides a simple numeric measure of a person’s thickness or thinness, allowing health professionals to discuss weight problems more objectively with their patients.

1 kg = 2.21 pounds
1m= 100 cm

To work out your BMI:
• divide your weight in kilograms (kg) by your height in metres (m)
• then divide the answer by your height again to get your BMI

For example:
• if you weigh 70kg and you’re 1.75m tall, divide 70 by 1.75 – the answer is 40
• then divide 40 by 1.75 – the answer is 22.9
• your BMI is 22.9kg/m2

The BMI is universally expressed in kg/m2. BMI is a measurement which determines which weight category a person belongs to. Depending on their height and weight, a person can belong to one of the following weight categories:
• underweight (BMI less than 18.5)
• normal weight (BMI between 18.5 & 24.9)
• overweight (BMI between 25.0 & 29.9)
• obese (BMI 30.0 and above)

Heart rate/ Pulse

According to Mayo Clinic, a normal resting heart rate for adults ranges from 60 to 100 beats a minute. Generally, a lower heart rate at rest implies more efficient heart function and better cardiovascular fitness. For example, a well-trained athlete might have a normal resting heart rate closer to 40 beats a minute.

For Healthy Teeth
Regular dental visits are important because they help keep your teeth and gums healthy. You should have a regular dental visit at least every 6 months.

Make the habit of flossing your teeth at least once a day. The American Dental Hygienists’ Association explains the key elements of proper flossing technique in four simple steps:
1. Wind: Wind 18 inches of floss around middle fingers of each hand. Pinch floss between thumbs and index fingers, leaving a one- to two-inch length in between. Use thumbs to direct floss between upper teeth.
2. Guide: Keep a one- to two-inch length of floss taut between fingers. Use index fingers to guide floss between contacts of the lower teeth.
3. Glide: Gently guide floss between the teeth by using a zig-zag motion. DO NOT SNAP FLOSS BETWEEN YOUR TEETH. Contour floss around the side of the tooth.
4. Slide: Slide floss up and down against the tooth surface and under the gum line. Floss each tooth thoroughly with a clean section of floss.

18 inches = 0.45 m
If one pack of dental floss has 50 m, it will last around 111 days if you floss once a day.

Strands of Hairs

Do you know that losing up to 100 strands of hairs per day is normal? Don’t panic if you lose some hairs. However, But if you really feel like you’ve started to lose an excessive amount of hair each day, , you should try to change your shampoo and eat more healthy food. Vitamin C, B vitamins such as Biotin (Vitamin B7 or Vitamin H) and Niacin (Vitamin B3) have been shown to be essential for hair growth.

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Calories are a measure of the amount of energy in food. Knowing how many calories are in our food can help us to balance the energy we put into our bodies with the energy we use. That’s the key to a healthy weight. For example, an apple may have 80 calories, while a 1 mile walk might use up about 100 calories.

Everyone requires different amounts of energy per day depending on age, size and activity levels. “Empty calories” describe foods high in energy but low in nutritional value. Foods such as ice cream and bacon contain the most empty calories. The FAO (Food and Agriculture Organization) of the United Nations says the average adult should consume no less than 1,800 calories per day. You can use app such as Fitness Pal to keep track of your calories intake so that you can achieve your target weight.

1 mile= 1.60934 km

Walk 10,000 steps per day

It’s believed that the concept of 10,000 steps originated in Japan in the run-up to the 1964 Tokyo Olympics, says Catrine Tudor-Locke, an associate professor at the Pennington Biomedical Research Centre at Louisiana State University. Pedometers became all the rage in the country as Olympic fever swept through Japanese society. One company came out with a device called a manpo-kei, which means 10,000 step meter. “It was a business slogan, like ‘Just Do It’ for Nike, but it resonated with people,” Tudor-Locke says. Since then 10,000 steps has become a commonly-acknowledged goal for daily fitness across the world.

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With extended exposure, noises that reach a decibel level of 85 can cause permanent damage to the hair cells in the inner ear, leading to hearing loss. Your distance from the source of the sound and the length of time you are exposed to the sound are also important factors in protecting your hearing. A good rule of thumb is to avoid noises that are too loud, too close, or last too long. An MP3 player at maximum volume has 105 decibels.


20/20 vision (or really, 20/20 visual acuity) is considered “normal” vision, meaning you can read at 20 feet a letter that most human beings should be able to read at 20 feet. Food that maintain healthy eyes are carrots, oranges, fishes and leafy greens.

Body Temperature

37 degree Celsius is the normal body temperature. A fever is when a person’s body temperature is hotter than 37.5 degrees Celsius (99.5 Fahrenheit).


In order for our bodies to function properly and stay healthy, it is important that we follow a good nutritious diet. Foods are made up of 6 classes of nutrients. These nutrients are macronutrients (protein, carbohydrates, fats), micronutrients (vitamins and minerals) and water.

Important Nutrients For Body