Estimate how many calories your body burns at rest and see your BMI. A simple starting point if you are thinking about becoming a surrogate, preparing as an intended parent, or exploring egg donation.
Leave as is if you are unsure.
Calculated in your browser. Your details are not saved or sent anywhere.
Enter your details and select Calculate to see your results here.
| Typical activity level | Calories / day |
|---|
Your BMR, BMI and calorie estimates are general guides. They are not a diagnosis, a treatment plan or a decision about eligibility. Surrogacy4All is a physician-led agency, and our medical team can help you understand what these numbers may mean for your own journey, whether you are thinking about becoming a surrogate, preparing for IVF as an intended parent, or exploring egg donation.
Criteria such as BMI are set by the receiving fertility clinic, and its reproductive endocrinologist makes the final medical decision. Our team can help you prepare your questions and coordinate with your clinic and obstetric provider. Please do not start a restrictive diet or an intense exercise programme, or change any prescribed medicine, because of a calculator result. Speak with a qualified clinician first. If you are pregnant, have symptoms or have a medical concern, contact your own doctor, or emergency services if it is urgent.
Want to check your BMI on its own? Try our dedicated BMI calculator and bring the result to your next conversation with your doctor or our medical team.
Your basal metabolic rate is the energy your body uses at complete rest to keep everything running: breathing, circulating blood, regulating temperature, repairing cells and powering the brain. For many adults it makes up roughly 60 to 70 percent of the calories burned in a day. Movement, digestion and daily activity account for the rest. A basal metabolic rate calculator estimates this figure from your age, sex, height and weight, because those four factors track closely with how much body tissue you have to fuel.
To calculate basal metabolic rate, three equations are in common use. Anyone figuring BMR on paper needs weight in kilograms, height in centimetres and age in years.
Take a 30-year-old woman who weighs 65 kg and is 165 cm tall. The first equation gives 650 + 1,031 − 150 − 161, which is about 1,370 kcal per day.
Which one should you pick? The first has performed best in several validation studies of healthy adults, so it is the default in the tool. The revised Harris-Benedict tends to read a little higher for many people. Katch-McArdle suits lean or muscular people who know their body fat percentage.
BMR is only the floor. Multiply it by an activity factor and you get an estimate of your total daily energy expenditure (TDEE), the calories you use across a whole day. Because the results table does this for five activity levels, the tool also works as a basal metabolic rate calorie calculator. Using the example above:
| Activity Level | Factor | Calories per Day |
|---|---|---|
| Sedentary (little or no exercise) | 1.2 | About 1,644 |
| Light (1–3 days a week) | 1.375 | About 1,884 |
| Moderate (3–5 days a week) | 1.55 | About 2,124 |
| Active (6–7 days a week) | 1.725 | About 2,364 |
| Very active (hard exercise or physical job) | 1.9 | About 2,603 |
Sex and age
ages 18 to 90 are accepted.
Height
centimetres, or feet and inches.
Weight
kilograms, pounds, or stone and pounds.
Formula (optional)
open Advanced options to switch formulas. Choosing Katch-McArdle reveals a body fat field. Most people can leave the default alone.
Results
select Calculate to calculate BMR in both kilocalories and kilojoules, along with the five-row activity table.
Pregnancy and breastfeeding
a status option appears when Female is selected. Pregnant users get guidance instead of numbers, and breastfeeding users get a reminder that their needs are higher.
Reset: clears every field in one click.
Use it as a BMR rate calculator whenever your routine or body changes. People searching for ways to calculate my BMR usually want a quick answer, and the default settings give one in seconds.
As an online BMR calculator that runs in your browser, it does not store or send anything you enter. Input checks reject impossible values, such as a height of 3 cm, so a typing slip does not produce a misleading result.
The World Health Organization groups adult BMI into the BMI categories below. The healthy BMI range runs from 18.5 to 24.9.
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Healthy weight |
| 25 – 29.9 | Overweight |
| 30 – 34.9 | Obesity, class 1 |
| 35 – 39.9 | Obesity, class 2 |
| 40 and above | Obesity, class 3 |
The formula and adult cut-offs are the same for everyone, so a BMI calculator for females and a BMI calculator for men return the same category for the same height and weight. What differs is what the number hides: at the same BMI, women generally carry a higher percentage of body fat than men. A women’s BMI calculator also cannot account for pregnancy, when weight rises for healthy reasons.
If you choose Female in this tool, you can say whether you are pregnant or breastfeeding. That makes it a more sensible BMI calculator for female users than a plain height-and-weight form. If you select pregnant, no BMI is shown, because a reading based on current weight can mislead.
Genuinely, BMI does not measure body fat. A muscular athlete and a person with little muscle can share the same BMI, and BMI also misses where fat is stored. A BMI estimator cannot separate those cases. It is also less reliable for older adults who have lost muscle and for people from different ethnic backgrounds. It is not meant for children and teenagers, whose results are read against age- and sex-specific growth charts. For a fuller picture, pair BMI with waist circumference, blood pressure, blood sugar and cholesterol checks.
A determining BMI calculator is only as reliable as the numbers you feed it. Measure height without shoes and weigh yourself at a similar time of day. A correct BMI calculator should also reject impossible entries instead of quietly returning nonsense, and this one does.
Because a body BMI calculator only needs height and weight, there is little to fill in. You can use the tool as a BMI calculator online on a phone, tablet or desktop. Heights go in as centimetres or feet and inches, and weights as kilograms, pounds or stone and pounds.
Talk with our physician-led team about your family, embryos, timeline and budget. We’ll explain your options and next steps with no obligation.
Our job is to listen, to connect the dots between your needs, and to determine how we can best help you have your baby. If you’re asking how much does it cost for a surrogate, we’ll walk you through every step of the process to ensure there are no surprises.
To make an appointment with one of our counselors or physicians, please call (212) 661-7673 or email info@surrogacy4all.com. We look forward to hearing from you.
Since 2006, Surrogacy4All has helped intended parents in the United States and around the world build their families through physician-led gestational surrogacy and egg donation.
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Disclaimer: THIS WEBSITE DOES NOT PROVIDE MEDICAL ADVICE AND MAY BE OUT OF DATE. The information, including but not limited to text, PDFs, graphics, images, and other material contained on this website, is for general educational purposes only. No material on this site is intended to be a substitute for professional medical advice, diagnosis, or treatment, and does not create a patient-doctor relationship. Pricing on the website may be out of date, is subject to change without notice, and may be subject to additional terms and conditions. No information on this site is intended to be a financial quote for medical services. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have regarding a medical condition, lifestyle or dietary changes, treatments, and before undertaking a new healthcare regimen. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
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