Beauty Products Calculator
Estimate how many uses you get from mascara, foundation, lipstick, eyeliner, or custom beauty products and what each use costs.
The calculator follows Omni's formula: applications, cost per application, and days until the product runs out.
Product Summary
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Run the calculation to see your product estimate.
Quick Answer
Beauty product longevity depends on product volume, efficiency, layers per use, and how often you reapply it during the day.
How to Calculate
- Choose the product type or enter a custom efficiency.
- Enter product volume and unit.
- Enter layers per application and applications per day.
- Click Calculate to see applications, cost, and lifespan.
Formula
Applications = efficiency × volume / layers per application
Cost per application = product price / applications
Days until empty = applications / applications per day
Worked Examples
Example 1: 0.34 fl oz mascara, 2 layers per use, and 1 use per day gives about 30 applications and a cost of about $0.15 per use.
Example 2: 120 mL foundation with 1 layer per day lasts far longer because the product volume is much larger.
Example 3: Reapplying twice per day cuts the lifespan in half compared with a single daily application.
How to Interpret the Result
| Output | Meaning |
|---|---|
| Applications | Total number of uses before the product runs out. |
| Cost per application | How much one use costs based on the product price. |
| Days until empty | Estimated lifespan based on your daily usage. |
Frequently Asked Questions
Related Calculators
References
- OmniCalculator reference page
- The reference page uses efficiency, volume, layers per application, and applications per day to estimate lifespan.
- Last reviewed: March 2026.