Protein Calculator for Seniors and Adults: How Much Protein Do I Need? | Calculators & Tools | Part 1

This article is part of our Calculators & Tools series: simple tools that help you work out what your body needs each day.

This is Part 1: the protein calculator.

Starting to exercise, going on a diet, getting older, or just curious whether your meals are giving you enough protein?

This protein calculator for seniors and younger adults will estimate how much you might want to aim for each day, based on your age, weight, sex, diet and activity – and give you some mealtime ideas along the way. Don’t rely on this as medical advice, but take it as a helpful starting point.

How much protein do I need?

Protein requirements depend on body weight, age, activity and general health. For healthy adults in the US, the Recommended Dietary Allowance (RDA) is 0.8 g of protein per kg of body weight every day (National Academies, 2005).

That’s about 55 g a day for a 150 lb (68 kg) adult. This is an approximate guideline and not a precise recommendation for each individual.

The tool uses 0.8 g/kg for every diet – vegetarian, egg, or meat and fish. It does not mean that every adult must have exactly this amount, or that people who eat meat will naturally have more than they need.

Portion sizes and general diet quality are still important factors – this is a practical approach for the tool, so long as it is clearly explained that it is not a clinical recommendation.

How much protein do seniors need?

Adults over 65 should be aware that muscle mass and strength can decline with age, so they may need to consume more protein than the basic adult RDA, depending on their health and activity level.

People who exercise regularly and do strength training may also need to increase their intake beyond the basic reference, depending on the nature and extent of their activity.

Someone who is ill, eating very little or recovering from an operation may need specialist advice. As a practical matter, I would look at the person’s usual diet, portion sizes and general lifestyle before making recommendations. For a standard healthy adult, the RDA applies.

How much protein per day? A simple table of protein needs

These examples are based on a 150 lb (68 kg) adult. The figures are general guidelines, not individual recommendations.

Getting there with everyday food

These example days illustrate how normal meals can add up to a reasonable protein intake – the estimates are approximate and depend on how much food is actually eaten.

Vegetarian day – around 60–65 g

Breakfast: a cup of plain Greek yogurt with berries and a spoonful of chopped walnuts (about 20 g). Lunch: a bean and cheese burrito (about 18 g). Snack: a glass of milk (about 8 g). Dinner: a bowl of lentil soup with a slice of whole-wheat bread (about 18 g). Total: about 64 g.

Egg day – around 60–70 g

Breakfast: two scrambled eggs with two slices of whole-wheat toast (about 20 g). Lunch: a bowl of bean chili (about 15 g). Snack: a slice of cheese with crackers (about 7 g). Dinner: a two-egg vegetable omelet with half a cup of cottage cheese on the side (about 24 g). Total: about 66 g, depending on portion sizes.

Meat and fish day – around 70–75 g

Breakfast: oatmeal made with a cup of milk (about 13 g). Lunch: a turkey sandwich with 3 oz of sliced turkey (about 30 g). Snack: an apple with two tablespoons of peanut butter (about 7 g). Dinner: 3 oz of baked salmon with rice and vegetables (about 23 g). Total: about 73 g.

A common mistake is to think that a bowl of vegetable soup or a salad with a few chickpeas contains as much protein as a chicken breast or a tub of Greek yogurt – a small serving may have less than you expect.

Bread, pasta, milk, cheese and snacks add to the total, so consider the whole day rather than a single food. A daily protein calculator can help you to look at your diet, but the portions are important.

Spreading it over the day

For many people, it is easier to include a source of protein with each of the main meals, rather than trying to eat most of the day’s protein at dinner. At breakfast, try eggs, Greek yogurt, milk or cottage cheese.

For lunch, consider beans, lentil soup, tuna, turkey or chicken. At dinner, try fish, chicken, tofu, beans, eggs or another suitable food. Add nuts, cheese or yogurt as a snack, if you like.

You do not need to make every meal elaborate: a bowl of chili, or yogurt with breakfast, may be enough. If you use an egg protein calculator, remember that one egg contains roughly 6–7 g of protein, so eggs can contribute to your total but may not be enough on their own.

When this calculator is not for you

This calculator provides general guidance for healthy adults – it is not a way of setting protein requirements for medical conditions. If you have kidney disease, talk to your doctor or registered dietitian before changing your protein intake.

Some people with kidney disease need to reduce their protein intake, while others may have particular requirements based on their condition and treatment.

If you are pregnant or breastfeeding, under 18, recovering from an illness or operation, or have been advised by a doctor to limit your protein, talk to a qualified healthcare professional.

Children and teens have different requirements from adults – serious athletes or people doing high-volume training may also need their requirements assessed individually. Do not use the results of the calculator as a substitute for professional medical advice.

Protein in everyday foods

Quick guide: Common foods such as beans, lentils, milk, yogurt, cheese, eggs, fish and chicken can provide good quantities of protein depending on the type and amount eaten. You can include them in your daily meals to meet your daily protein needs without spending extra.

Introduction

Protein is needed to build and repair the body. This guide gives values for common foods in terms of a typical serving – a cup, a slice, one egg or 3 oz of cooked meat or fish.

The values given are approximate and may vary depending on the type of food and how it is prepared.

Understanding the protein values

Some entries for the same food may vary. This is because some values are given for dry or raw foods while others are for cooked ones.

For example, dry beans absorb water when cooked, increasing their weight. However, water does not add protein, so 100 g of cooked beans and 100 g of dry beans do not have the same amount of protein.

The amount of food you eat can also vary depending on how you prepare and serve it. For example, a cup of thin bean soup will have less protein than a cup of thick chili. The values given here show approximate amounts for different foods.

Protein-rich foods

Vegetarian foods

The values below are given per 100 g of food, as listed in USDA FoodData Central. Beans and lentils are cooked; the other foods are listed in their usual form (USDA FoodData Central, SR Legacy).

Figures are from USDA FoodData Central (SR Legacy).

Note: Dry/raw food values are not the same as values for the same weight of cooked food. All values are approximate.

A bowl of chili, bean soup or lentils can give you a good amount of protein. However, bear in mind that the amount depends on how much you serve and the recipe used.

Tofu and edamame are also good sources of protein. Make sure to check the package for the amount of protein in a serving, because products differ.

Eggs

One large hard-boiled egg has about 6 g of protein. The amount of protein in one egg depends on its size. According to USDA FoodData Central, there are about 12.6 g of protein in 100 g of hard-boiled whole egg.

You can have a boiled egg, scrambled eggs or an omelet with toast for a good supply of protein. However, try not to rely on just one or two foods for all your protein needs.

Fish and chicken

The amount of protein varies with the type and cut of fish and chicken. According to USDA FoodData Central, there are about 31 g of protein in 100 g of roasted, skinless chicken breast.

For fish, there are about 22 g of protein in 100 g of cooked farmed Atlantic salmon. These are values for cooked food; raw food has less protein per 100 g, because meat and fish lose water as they cook.

Fish and chicken can be included in your daily meals depending on your preferences and budget. Again, bear in mind that weight changes as food is cooked due to loss or gain of water.

Protein-rich fruits

Fruits such as apples, bananas, oranges, berries and grapes are good for general health but have low protein content. They should not be relied on as the main protein sources. Instead, make use of more protein-rich foods such as beans, lentils, milk, yogurt, cheese, eggs, fish and chicken. You can enjoy fruit with yogurt or milk as a snack.

Getting more value from plant-based proteins

A vegetarian diet can supply enough protein if it has a good variety of foods. Try these combinations:

• Beans and rice – both have protein.
• Bean chili and rice – rice provides carbohydrates while beans provide protein.
• Peanut butter on whole-wheat toast – a good combination for breakfast.
• Tofu and vegetables – you can use them in a stir-fry.
• Hummus and whole-wheat bread – an easy protein snack.

It is not always necessary to combine the right foods at one meal. What matters most is a good variety of food throughout the day.

Beans, lentils, eggs and milk are relatively cheap sources of protein. Make sure to choose healthy foods that can add up to your daily protein needs without breaking the bank.

Common myths about protein

Myth 1: One bowl of beans provides enough protein for the day.

One bowl of beans can add a good amount of protein to your diet, but it cannot supply enough protein for the whole day.

Myth 2: Only eggs, chicken, and fish have good amounts of protein.

This is not true, since many other foods such as beans, lentils, soy, milk, yogurt and cheese have generous amounts of protein. Vegetarians can meet their protein needs by including a good variety of protein-rich vegetarian foods in their daily diet.

Myth 3: Fruits are good sources of protein.

This is not true, since most fruits have low amounts of protein.

Myth 4: Everyone needs to take protein powder.

This is untrue: most people can get enough protein from a normal balanced diet. However, protein supplements may help some people who cannot meet their needs through food alone. Their use should be guided by a qualified healthcare professional.

Questions people often ask

How many grams of protein should a 70 year old have each day?

At the adult RDA of 0.8 g/kg/day, a 150 lb (68 kg) 70-year-old would need about 55 g a day. Many older adults may benefit from more, depending on their health, appetite and activity – there is no single value that suits everyone.

How can I get 70 g of protein a day?

Include a protein food at each meal: eggs or Greek yogurt at breakfast, beans, tuna or turkey at lunch, nuts or cheese as a snack, and fish, chicken, tofu or eggs at dinner. The exact amount depends on portion sizes.

How can I eat 100 g of protein a day?

It is possible with suitable planning and portion sizes of foods such as Greek yogurt, cottage cheese, beans, eggs, fish or chicken. However, 100 g is not a requirement for everyone – find out whether it is appropriate for you.

Are beans enough protein for vegetarians?

Beans are a good source, but a small serving may not provide your daily requirement. Combine them with other protein foods such as lentils, tofu, milk, yogurt, cheese, eggs, nuts and seeds – and pay attention to portions.

Do I need protein powder?

Not necessarily: many people can get all the protein they need from normal food. Supplements may be convenient in some cases, but are not a requirement for most people and should not be used as a substitute for food.

Does extra protein harm the kidneys?

People with kidney disease may need to adjust their protein intake, depending on their condition. For healthy adults, requirements vary, but eating large amounts of protein unnecessarily is not a substitute for a balanced diet.

Which common food has the most protein?

Among the foods in this calculator, roasted chicken breast (about 31 g of protein per 100 g), roasted pumpkin seeds (about 30 g) and roasted turkey breast and lean sirloin steak (about 29 g each) have the most protein per 100 g, according to USDA FoodData Central. Different products and cuts will have different amounts.

How much protein does one slice of bread, one egg and half a cup of beans have?

One slice of whole-wheat bread provides about 4 g of protein, one large egg about 6 g, and half a cup of cooked black beans about 7–8 g. Slice sizes, egg sizes and portions vary, so you need to consider them to work out the amount of protein.

Can I get all the protein I need from vegetarian food?

Most people can meet their protein requirements by eating a healthy vegetarian diet as long as they eat a good variety of foods.

Make sure to include beans, lentils, soy, milk, yogurt, cheese, and eggs (if you eat them) in your daily diet if you are a vegetarian. Your protein requirements will also depend on your sex, weight, age, and level of physical activity.

The Calculators & Tools series

• Part 1: Protein Calculator (you are here)
• Part 2: Vitamin Calculator

Read more

• Which protein is best for you?
• Senior nutrition: prevent muscle loss
• Is your daily walk doing enough?
• Senior nutrition in 2026: protein, supplements and plant-based diets
• How wearables help track the effects of GLP-1 drugs

References

1. National Academies of Sciences, Engineering, and Medicine. Dietary Reference Intakes (DRIs): Recommended Dietary Allowances and Adequate Intakes, Total Water and Macronutrients. Available at: National Academies – DRI summary table. Accessed October 28, 2026.
2. Bauer J, Biolo G, Cederholm T, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc. 2013. Available at: JAMDA – PROT-AGE position paper. Accessed October 28, 2026.
3. International Society of Sports Nutrition position stand: protein and exercise. J Int Soc Sports Nutr. 2007. Available at: PubMed Central – ISSN position stand. Accessed October 28, 2026.
4. U.S. Department of Agriculture. FoodData Central. Available at: USDA FoodData Central. Accessed October 28, 2026.
5. U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans, 2020–2025. Available at: DietaryGuidelines.gov – 2020–2025 edition. Accessed October 28, 2026.

All reference links checked on October 28, 2026.

Disclaimer

This calculator provides a general indication for educational purposes only. It is not a substitute for medical advice and should not be used as a basis for diagnosis or treatment. Talk to a doctor or registered dietitian for personal medical advice.