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Free health tool

Supplement bottle calculator

Estimate how long an existing supplement supply may last using the amount in the container and the amount already planned per day—not to choose a dose.

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Calculate your result

Use the total shown on the label, such as 60 capsules, 300 g or 200 mL. Keep that unit for both fields. Enter the number only, without a thousands separator.

Accepted range: 0.01 to 1000000

Use your current planned routine in the same unit as the container amount. Enter the number without a thousands separator. This tool does not recommend the amount.

Accepted range: 0.01 to 1000000

Your result will appear here

Nothing is saved or added to the URL.

What this result means

Enter the total amount in the container and the amount already planned per day using the same unit—for example, capsules with capsules or millilitres with millilitres. The calculator divides the first amount by the second to estimate the number of days.

Use the same unit in both fields

Enter capsules with capsules, tablets with tablets, gummies with gummies, grams with grams, millilitres with millilitres, or servings with servings. Do not divide a container weight by a scoop count unless you first know the matching amount in the same unit.

Where to find the amounts on the label

A US Supplement Facts label identifies Serving Size and generally lists Servings Per Container, although FDA says the latter may be omitted when it duplicates the net quantity statement. Other labels may state the net quantity and a recommended daily dose. Use the label that belongs to your product and keep its unit unchanged. [1][2]

What a partial day means

A result such as 33.3 days means the arithmetic leaves only part of the amount entered for a full day after 33 complete days. It does not mean the product will provide 34 complete daily amounts.

Why the real duration may differ

Powders and liquids may vary slightly between measurements, label totals can be rounded, some product may remain in the container, and a routine can change. Treat the result as a planning estimate, not an inventory guarantee.

Supply duration is not shelf life

This calculation estimates how long the entered quantity may cover. It cannot determine whether the product will remain in date, stable, properly stored or effective for that period. Check the product label and manufacturer information separately.

This calculator does not recommend a dose

Use only an amount you have already chosen from the product label or with an appropriately qualified professional. Food-supplement labels include directions and warnings, including not exceeding the stated recommended daily dose where required; this page does not replace them. [2]

Formula and assumptions

Formula
Estimated days = amount in the container Ă· amount used per day. Both amounts must use the same physical unit.
Version
Supplement container duration ratio, supplement-container-duration-v1
Rounding
Divide using the entered values and round once for display to one decimal place. A positive result that would round to 0.0 is displayed as less than 0.1 rather than zero.
Worked example
A bottle containing 60 capsules with an existing plan of 2 capsules per day gives 60 Ă· 2 = 30.0 estimated days. The example demonstrates arithmetic only and does not recommend taking 2 capsules.

Who this is for — and when not to use it

Intended use

Neutral supply-duration arithmetic for an existing labelled food supplement when the container amount and already planned daily amount can be entered in the same unit.

Not intended for

This tool does not choose or validate a dose, check interactions, assess safety or effectiveness, interpret symptoms, estimate expiry or potency, calculate medicine days' supply, plan refills, or provide peptide or reconstitution guidance.

Exclusions

  • Medicines, prescriptions or pharmacy days-supply decisions
  • Peptides, injections, vials or reconstitution calculations
  • Choosing, changing or validating a supplement dose
  • Products used only as needed or on a changing schedule
  • Interaction, contraindication, symptom or treatment advice
  • Expiry, shelf-life, storage, potency or product-quality assessment
  • Refill-date prediction or adherence tracking

Evidence sources

  1. 1. Dietary Supplement Labeling Guide: Chapter IV. Nutrition Labeling — U.S. Food and Drug Administration. Accessed Aug 10, 2026.
  2. 2. Food supplements guidance — UK Government. Accessed Aug 10, 2026.