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Your 100g face cream looks perfect. The texture is smooth, the fragrance feels right and the pH is where you want it.
Now you have your first real orders or you're preparing for a larger production batch.
Can you simply multiply every ingredient by 100 to make 10kg?
Mathematically, yes. Practically, not always.
Scaling a cosmetic formulation involves two different things:
Formula scaling changes ingredient quantities while maintaining percentages. Process scaling ensures the larger batch can reproduce the same mixing, temperature, dispersion and final product characteristics.
This distinction matters for skincare startups, cosmetic brands and formulators moving from samples to commercial production.
First: Is Your Cosmetic Formula Ready to Scale?
Don't scale simply because one 100g sample turned out well.
Before moving to a larger batch, ask:
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Can you reproduce the same formula consistently?
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Is every ingredient recorded as a percentage?
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Have you documented your temperatures, mixing method and processing sequence?
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Have you checked pH and basic stability?
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Do you know the specification and recommended usage range of your raw materials?
If the answer to several of these is no, make another pilot batch first.
A sensible development journey is:
100g prototype → 500g–1kg pilot → evaluate/test → adjust if required → larger pilot/commercial batch
A failed 500g experiment is inconvenient.
A failed 10kg batch is expensive.
How Do You Convert a 100g Formula to 1kg or 10kg?
Start by converting the entire formulation into percentages.
Your finished formula should equal 100%.
| Ingredient | Formula % | 100g | 1kg | 10kg |
|---|---|---|---|---|
| Water | 70% | 70g | 700g | 7kg |
| Oil phase | 15% | 15g | 150g | 1.5kg |
| Emulsifier | 5% | 5g | 50g | 500g |
| Humectant | 5% | 5g | 50g | 500g |
| Other ingredients | 4% | 4g | 40g | 400g |
| Preservative | 1% | 1g | 10g | 100g |
| Total | 100% | 100g | 1kg | 10kg |
Use:
Ingredient required = Total batch weight × Ingredient percentage
For example, if an ingredient is used at 2% in a 10kg batch:
10,000g × 2% = 200g
The calculation is straightforward. Reproducing the same product at a larger scale is the more important challenge.
Why Can a 10kg Batch Behave Differently From a 100g Batch?
Your percentages may remain identical while your manufacturing conditions change.
Larger batches can have different:
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heating and cooling times
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mixing efficiency
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shear
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powder dispersion
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emulsification behaviour
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viscosity development
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fragrance distribution
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pH adjustment
A small hand blender working with 100g of cream doesn't necessarily reproduce the same conditions as larger manufacturing equipment processing 10kg.
That is why you shouldn't immediately change the formula when a scaled batch behaves differently. Check the process first.
My Larger Batch Became Thinner. Should I Add More Thickener?
Not immediately.
If viscosity drops after scaling, investigate:
Was the same processing temperature reached?
Some emulsification and thickening systems depend on specific processing conditions.
Was the mixing method different?
A larger volume may require different equipment, mixing time or shear.
Was the thickener properly dispersed or hydrated?
Poor dispersion can cause inconsistent viscosity or lumps.
Did the final pH change?
Certain thickeners and formulation systems are sensitive to pH.
Only consider changing ingredient percentages after identifying whether the issue comes from the formula or the manufacturing process.
My Cream Started Separating. Do I Need More Emulsifier?
Not necessarily.
Adding extra emulsifier without understanding the cause can create another formulation problem.
Check:
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Is the oil-to-water ratio unchanged?
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Is the emulsifier being used within the supplier's recommended range?
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Were the phases processed at the appropriate temperatures?
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Was mixing or homogenisation adequate for the larger batch?
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Did you introduce a new active, fragrance, electrolyte or other ingredient?
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Did the final pH change?
Separation can result from the emulsifier system, ingredient compatibility, processing conditions, oil-phase load or inadequate homogenisation.
Diagnose first. Reformulate second.
Can You Simply Multiply the Preservative Quantity?
Calculate preservatives according to the final formulation percentage and supplier recommendations, rather than adding extra preservative simply because the batch is larger.
Preservative performance can depend on:
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formulation pH
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water activity
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ingredient compatibility
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manufacturing hygiene
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packaging
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recommended usage range
The same principle applies to fragrance oils, essential oils, colourants and active ingredients.
Don't increase them by intuition. Review the relevant technical information and applicable usage restrictions for the specific ingredient and application.
Products intended for commercial sale should also undergo appropriate stability, compatibility and microbiological testing.
When Should a Startup Start Buying Cosmetic Ingredients in Bulk?
Bulk purchasing becomes more sensible once your formulation and expected production requirements are reasonably clear.
Consider larger quantities when:
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your pilot formulation is repeatable
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the ingredient is used across several products
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expected consumption justifies the pack size
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you understand its storage requirements
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the material can realistically be consumed within its shelf life
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you expect regular production
Stay with smaller quantities when:
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you're still changing the formula
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you're comparing alternative raw materials
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an ingredient is used at a very low percentage
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customer demand is still uncertain
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you haven't completed your pilot batches
The cheapest price per kilogram isn't always the cheapest purchasing decision.
A 20kg pack that expires before you consume it may cost more than purchasing smaller quantities when required.
Buy according to realistic consumption, shelf life and production plans, not only the lowest per-kg price.
What Should You Check Before Buying Raw Materials for a Larger Batch?
Once you move beyond DIY quantities, consistency becomes increasingly important.
Before placing a larger order, ask your raw-material supplier:
What is the INCI name?
Confirm exactly what material you're formulating with.
What is the recommended usage range?
Don't determine concentration through guesswork.
What are the storage conditions and shelf life?
This helps determine whether buying a larger quantity makes commercial sense.
Are relevant COA, SDS or technical specifications available?
Documentation becomes increasingly important as production grows.
Can the same grade/specification be supplied consistently?
Changing raw-material specifications can affect the finished formulation.
What is the MOQ for repeat purchases?
Your sourcing strategy should match realistic production requirements.
Price matters, but specification, consistency, documentation and suitability matter too.
Practical Checklist Before Moving From 100g to 10kg
Before increasing production, confirm:
✓ Formula converted to percentages
✓ Total formulation equals 100%
✓ Supplier usage recommendations checked
✓ Pilot batch successfully reproduced
✓ Final pH checked and documented
✓ Appearance, odour and viscosity recorded
✓ Heating/cooling conditions recorded
✓ Mixing method and time documented
✓ Raw-material specifications recorded
✓ Packaging compatibility considered
✓ Appropriate stability and microbiological testing planned
✓ Bulk quantities calculated from realistic production requirements
Also create a batch manufacturing record.
Record what you used, how much you used, when ingredients were added, temperatures, mixing conditions, pH and final observations.
If your 1kg pilot works perfectly, you should know exactly why and how it worked before attempting a larger batch.
From Sample Formula to Commercial Production: The Safer Route
Scaling shouldn't be:
Make 100g → like the result → buy ingredients in bulk → make 10kg.
A better route is:
Develop → document → pilot → evaluate → test → correct → scale → source in bulk
This may appear slower initially, but it can reduce wasted raw materials, inconsistent batches and expensive reformulation.
For skincare startups, cosmetic brands and formulators, the goal isn't simply to make more product.
The goal is to make the same product consistently as production grows.
When you're ready to purchase cosmetic raw materials in larger quantities, compare suppliers and ingredients based on function, specification, recommended usage, documentation, consistency, shelf life and actual batch requirements, not price alone.
Frequently Asked Questions
Can I directly convert a 100g cosmetic formula to 10kg?
You can mathematically scale a percentage-based formula to 10kg. However, making a pilot batch first is advisable because mixing, heating, cooling, dispersion and emulsification can behave differently as batch size increases.
How do I calculate ingredient quantities for a 10kg cosmetic batch?
Convert 10kg to 10,000g and multiply it by the ingredient percentage. For example, an ingredient used at 3% requires 300g for a 10kg batch.
Why is my 10kg batch different from my 100g sample?
Check your manufacturing process before changing ingredient percentages. Equipment, shear, mixing time, heating/cooling rates, dispersion and final pH can all affect the finished product.
Should I add more emulsifier if my larger batch separates?
Not automatically. First investigate the oil-to-water ratio, emulsifier usage range, processing temperatures, mixing, pH and ingredient compatibility. Increasing emulsifier without identifying the cause may not solve the problem.
When should a skincare startup start buying raw materials in bulk?
Consider bulk purchasing when your formulation is reasonably finalized, pilot batches are repeatable, expected consumption is known and you can use the material within its recommended shelf life and storage conditions
What documents should I request when buying cosmetic raw materials?
Depending on the material and application, useful information may include the INCI name, specification/TDS, SDS, batch COA, recommended usage range, shelf life and storage requirements.
Should I increase the preservative percentage when increasing batch size?
Not simply because the batch is larger. Use the preservative according to the validated formulation, supplier recommendations and applicable limits, while considering factors such as pH, compatibility, packaging and appropriate microbiological testing.