Dawnjar · Label maths
Protein Calculator: Cost per Gram and Protein per Calorie
This tool compares products by cost per gram of protein and protein per 100 calories. It does not tell you how much protein to eat.
Key takeaways
- The tool compares products by cost per gram of protein and protein per 100 calories.
- It does not say how much protein to eat.
- Use the label numbers per serving, and check that serving sizes match before comparing.
- An NPN is an eight-digit Health Canada product licence number, not a store endorsement.
Single product
Enter positive numbers only; a result shows — until its inputs are valid. Calculations run in your browser. Nothing is sent or stored.
How to use the calculator
Pick up the package, or open its listing, and find four figures: the price you would pay, the number of servings the package states, the grams of protein in one serving and the calories in that same serving. Type each one into its field. The results update as you type, and any result whose inputs are missing, zero or negative stays as a dash rather than showing a misleading number.
To weigh two or three options side by side, switch to the comparison mode. Each row works independently, so you can fill in a powder, a bar and a ready-to-drink bottle and read the outputs in one place. When at least two rows are complete, the lowest cost per gram and the highest protein per 100 calories are outlined. That outline marks a mathematical extreme among the rows you entered, nothing more; it is not a verdict on flavour, ingredients or whether a product suits you.
Worked example, using example numbers, not real products: a tub priced at $40.00 lists 20 servings, with 25 g of protein and 120 calories per serving. Price per serving is $40.00 ÷ 20 = $2.00. The tub holds 20 × 25 = 500 g of protein, so cost per gram is $40.00 ÷ 500 = $0.080, and cost per 20 g is $1.60. Protein per 100 calories is 25 ÷ 120 × 100 ≈ 20.8 g. Now picture a box of bars at $30.00 with 12 bars, each with 20 g of protein and 200 calories: $2.50 per bar, $0.125 per gram, $2.50 per 20 g and 10.0 g per 100 calories. Same idea, different numbers, and now they line up on one scale.
Cost per gram of protein explained
A price per gram calculator answers a narrow question: what does each gram of protein in this package cost? The formula is package price divided by the total protein in the package, and the total protein is servings per package multiplied by protein per serving. Because the result does not depend on how big a scoop or bar happens to be, it lets you compare a large tub against a small box, or a drink against a snack, without being distracted by sticker price alone.
Single-gram figures are tiny and easy to misread, so the calculator also scales the same number up to 20 g. Cost per 20 g of protein is simply cost per gram multiplied by twenty. It is a reading aid, not a recommended portion: pick whichever scale you find easier to compare. Some Dawnjar guides use 25 g as their reference amount; switching between the two is a matter of multiplying by a different whole number, and the ranking of products never changes.
Keep in mind what this figure leaves out. Cost per gram says nothing about taste, texture, the rest of the ingredient list or how a format fits into your day. A cheaper gram from a product you would not finish is not a saving. Treat the number as one column in your comparison, next to the things only you can judge.
Protein to calorie ratio and protein per 100 calories
The protein to calorie ratio describes how much protein comes with a given number of calories. Dawnjar expresses it as protein per 100 calories: protein per serving divided by calories per serving, then multiplied by 100. A serving with 15 g of protein and 150 calories scores 10; one with 30 g and 150 calories scores 20. Scaling everything to 100 calories means serving size drops out, so a small pouch and a large bowl can be read on the same line.
There is an arithmetic ceiling worth knowing. Protein supplies roughly four calories per gram, so 100 calories of pure protein is about 25 g. Real foods also contain some carbohydrate or fat, which is why most labels land well below that figure. If a result looks higher than 25, recheck the numbers you typed: a common cause is mixing a per-serving protein value with calories for a different amount.
The calculator does not label a ratio as high enough or too low. It shows which of the products you entered delivers more protein for the same calories, and the comparison is only as meaningful as the labels behind it. The protein-per-calorie edit applies the same formula to the Dawnjar sample records if you want to see it in a sorted list.
Where to find the numbers on a label
Most protein foods in Canada carry a Nutrition Facts table. Near the top it states the serving size, in a household measure and in grams or millilitres, followed by calories and then the nutrients, including protein. Use the calories and protein from that table, and confirm both figures refer to the same serving. Servings per container is usually printed close to the serving size or elsewhere on the package; if it is missing, divide the net quantity by the serving size and note that your answer is an estimate.
Products licensed as natural health products use a product facts or similar panel instead. These list medicinal and non-medicinal ingredients and a recommended dose, and the protein amount may appear there rather than in a Nutrition Facts table. Read the panel carefully to find protein per dose and the number of doses in the container, then enter those as protein per serving and servings per package.
Scoops versus grams — powders often state a serving as one or more scoops alongside a weight in grams. The grams are the reliable figure; scoops vary between packages.
As sold versus as prepared — a mix may list values for the dry powder and separately for a prepared version. Use one column consistently for both protein and calories.
Multi-packs — for a box of bars or bottles, the servings are usually the number of units, but check whether one unit is labelled as one serving or more.
Common comparison mistakes
Comparing different serving sizes directly — a product with 30 g of protein in a double scoop is not equivalent to one with 20 g in a single scoop. The per-gram and per-100-calorie outputs exist to remove that distortion, so use them rather than the headline protein number.
Mixing sale and regular prices — if one row uses a temporary promotion and another a regular shelf price, the comparison reflects the promotion rather than the product. Note which price you entered, and rerun the numbers if it changes.
Trusting rounded servings per container — labels may say “about 28 servings”. Rounding can shift cost per gram slightly; when it matters, work out the count from net weight and serving weight.
Pairing numbers from different panels — taking protein from one source and calories from another, or from prepared and dry columns, produces a ratio that describes neither.
Forgetting extra costs — shipping fees, deposits or add-ins you always use are not on the label. Include them in the price field if you want them reflected.
Reading Canadian labels: NPN numbers
Health Canada states that “all natural health products sold in Canada require a product licence before being marketed.” Once a product is licensed, “the label will bear an eight digit product licence number preceded by the letters NPN, or DIN-HM for homeopathic medicines” (Health Canada, product licensing). Health Canada also explains that companies that manufacture, package, label or import natural health products must hold product and site licences (Health Canada, regulation of natural health products). Some protein supplements are sold under this framework, so you may notice the code near the product facts panel.
An NPN relates to the product licence, not to the store or seller, and it is not an endorsement of any retailer. Many protein powders and bars are sold as foods with a Nutrition Facts table instead and carry no NPN. Either way, the calculator works the same: it uses the protein, calories, servings and price you read from the package. If you want to check a number you see on a label, you can look it up in Health Canada's Licensed Natural Health Products Database.
Using the results
Once you have the figures, use them to narrow a shortlist rather than to make the decision for you. Cost per gram helps when you are choosing between package sizes or formats; protein per 100 calories helps when you are comparing how much protein arrives alongside the calories in each option. Write the results down next to your own notes on flavour and convenience, then decide. The guides below apply the same arithmetic to specific shopping questions using Dawnjar's sample records, which carry illustrative figures and CAD prices; ordering opens at launch.
Questions
What does this protein calculator do?
It turns four numbers from a package into comparable figures: price per serving, cost per gram of protein, cost per 20 g of protein and protein per 100 calories. You type in the package price in CAD, the servings per package, and the protein and calories per serving. Everything is calculated in your browser; nothing you enter is sent anywhere or saved.
Does it tell me how much protein I need?
No. The calculator only compares products with each other using the numbers printed on their labels. It does not estimate an intake, set a target or suggest an amount for anyone. For personal guidance, speak with a qualified professional.
How do I calculate cost per gram of protein?
Multiply the servings per package by the protein per serving to get the total grams of protein in the package. Then divide the package price by that total. For example, a $40.00 package with 20 servings of 25 g holds 500 g of protein, so each gram costs $0.08. Multiply by 20 to see the cost per 20 g of protein.
What is a good protein to calorie ratio?
There is no target here: the calculator only shows the arithmetic and does not label any ratio as good or bad. Protein per 100 calories is protein per serving divided by calories per serving, multiplied by 100. A serving with 20 g of protein and 160 calories works out to 12.5. Comparing two products this way shows which delivers more protein for the same calories, and you decide what matters for your own shopping.
What is an NPN on a Canadian supplement label?
In Canada, natural health products need a Health Canada product licence before they are sold. Once licensed, the label carries an eight-digit product licence number preceded by NPN, which stands for Natural Product Number, or DIN-HM for homeopathic medicines. You can look up the number in Health Canada's Licensed Natural Health Products Database.
Does an NPN mean a store is approved by Health Canada?
No. An NPN relates to the product licence, not to the store or seller offering the product, and it is not an endorsement of any retailer. Many protein powders and bars are sold as foods with a Nutrition Facts table instead and carry no NPN at all.
Keep exploring
Sources
- Health Canada — Product licensing of natural health products
- Health Canada — Regulation of natural health products
- Health Canada — Licensed Natural Health Products Database
Dawnjar preview pages use sample product records and illustrative nutrition figures. Ordering opens when real inventory and fulfillment are live. Nutrition information is general and informational only, not medical advice.