Are OXO Measuring Cups Microwave Safe: Safe Use Guide

Yes—many OXO measuring cups are microwave safe, but the answer depends on the material and model. OXO glass measuring cups made from heat-resistant borosilicate glass are designed for microwave use. Some OXO plastic measuring cups may also be microwave safe, while stainless steel cups are not.

For kitchens in the United States, the safest rule is simple: check the microwave-safe symbol on the cup, its packaging, or the exact OXO product page before heating it. Do not microwave any OXO measuring cup with metal parts, metallic markings, or visible damage.

Which OXO Measuring Cups Can Go in the Microwave?

OXO measuring cups fall into three main groups: glass, plastic, and stainless steel. Each material behaves differently in a microwave.

OXO measuring cup material	Microwave use	Main safety point
Heat-resistant glass	Usually yes	Use only if the model is marked microwave safe
Plastic	Model-dependent	Check the product label and avoid high heat for long periods
Stainless steel	No	Metal can spark and damage the microwave

OXO glass measuring cups

OXO glass measuring cups are commonly made from borosilicate glass, a type of heat-resistant glass. OXO lists its glass measuring cups as microwave safe when used as directed.

These cups are useful for tasks such as:

• Melting butter
• Heating water
• Warming milk
• Mixing a sauce before heating
• Measuring liquid ingredients for a recipe

Even heat-resistant glass needs care. A glass cup can break if it goes from a very cold condition straight into intense heat. It can also crack when placed on a cold or wet surface after heating.

OXO plastic measuring cups

OXO makes several plastic measuring cups and liquid measuring tools. Some are designed for microwave use, but plastic should not be treated as automatically microwave safe.

Look for one or more of these signs:

• A microwave-safe symbol on the bottom
• “Microwave safe” printed on the packaging
• Microwave instructions in the product manual
• A matching statement on the official OXO product page

If you cannot confirm the model, transfer the liquid to a known microwave-safe glass or ceramic container.

OXO stainless steel measuring cups

Stainless steel measuring cups should not go in a microwave. Metal can reflect microwave energy, which may cause arcing, sparks, or damage to the appliance.

This rule applies even if the cup is small. Never microwave stainless steel OXO measuring cups or any metal measuring tool.

How to Check Whether Your OXO Measuring Cup Is Microwave Safe

The most reliable method is to identify the exact cup and check its documented instructions. Do not rely on appearance alone.

1. Identify the material

First, determine whether the cup is:

• Glass
• Plastic
• Stainless steel
• A combination of materials

A clear cup may be glass or plastic. Tap it lightly and inspect the base, but do not use this as the final test. The product name, packaging, or care instructions are more reliable.

2. Inspect the bottom and handle

Look for:

• A microwave-safe icon
• A crossed-out microwave icon
• Product markings
• A model number
• Metal components
• A rubber or silicone grip

A silicone grip does not always make a product unsafe, but it is a reason to check the manufacturer’s instructions. Do not microwave a cup if the handle contains metal.

3. Search the exact OXO model

Use the full product name when checking OXO’s website. For example, “OXO 2-Cup Angled Measuring Cup” is more useful than a general search for “OXO measuring cup.”

Check the product’s:

• Care instructions
• Materials
• Use and safety notes
• Microwave guidance
• Dishwasher guidance

Product designs can change. A current official listing is more useful than an old marketplace description.

4. Check the user manual or package

If you still have the box or instruction sheet, read the care section. Packaging often gives the clearest answer for microwave use.

If the product is not identified, treat it as not confirmed for microwave use. That does not mean it will certainly fail. It means there is not enough evidence to recommend heating it.

How to Microwave an OXO Glass Measuring Cup Safely

If your OXO glass measuring cup is marked microwave safe, use it with the same care you would use for other heat-resistant glass.

1. Inspect the cup. Do not use it if you see chips, cracks, deep scratches, or cloudy stress marks.
2. Check the handle and markings. Make sure no metal is present.
3. Leave room at the top. Liquids can bubble, foam, or expand as they heat.
4. Heat in short intervals. Use 15- to 30-second intervals for small amounts.
5. Stir between intervals. This spreads heat and reduces hot spots.
6. Use an oven mitt or dry towel. The handle may become warm even when it feels safe.
7. Let the cup rest briefly. Hot glass can be easier to handle after the bubbling stops.
8. Place it on a dry, heat-safe surface. Avoid a cold stone counter or wet sink.

Do not seal the cup with a tight lid while heating. Steam needs a way to escape. If the cup includes a lid, use it only in the way OXO specifies.

What You Should Not Microwave in an OXO Measuring Cup

Microwave safety depends on more than the cup itself. The ingredient, cooking time, and cup condition also matter.

Do not microwave the following without clear instructions

• Stainless steel measuring cups
• Cups with metal trim or metallic paint
• Cracked or chipped glass cups
• A tightly sealed cup
• An empty cup
• A cup with unknown microwave instructions
• Very thick mixtures for long periods without stirring

An empty container can absorb microwave energy unevenly and may become unusually hot. Thick foods, such as butter, chocolate, syrup, or cheese, can also develop hot spots.

Be careful with thermal shock

Thermal shock happens when a material changes temperature too fast. For example, a cold glass cup filled with hot liquid may crack if the temperature difference is severe.

To reduce this risk:

• Do not heat a cup straight from the freezer unless the product instructions allow it.
• Do not pour boiling liquid into an ice-cold cup.
• Do not set hot glass on a wet or very cold surface.
• Do not add cold liquid to a hot, empty cup.
• Avoid using damaged glass.

Borosilicate glass resists temperature change better than ordinary glass, but it is not unbreakable.

Can You Microwave Butter or Water in an OXO Measuring Cup?

Usually, yes, if the specific OXO cup is marked microwave safe. Glass OXO measuring cups are often used for warming water, melting butter, and heating small amounts of liquid.

Use short heating periods rather than one long cycle. Butter can splatter as it melts, and water can become very hot without showing strong bubbling. Stir carefully and keep your face and hands away from rising steam.

For boiling water, use extra care. Water heated in a microwave can become hotter than its visible signs suggest. A sudden movement or added ingredient may cause it to erupt. Let the water stand briefly, then stir it with a suitable utensil.

Practical examples

Melting butter:
Use short intervals and stop when only a small solid piece remains. Stir to finish melting.

Warming milk:
Heat in short bursts and stir each time. Milk can foam and overflow quickly.

Heating water:
Leave headspace and use a potholder. Avoid sudden stirring immediately after heating.

Heating oil:
Use caution. Oil can become very hot, and a measuring cup may be difficult to handle safely. Use a container intended for hot cooking liquids.

Why Microwave-Safe Does Not Mean Oven-Safe

A microwave-safe label does not mean that an OXO measuring cup is safe for a conventional oven, toaster oven, broiler, or stovetop.

Microwaves heat food through electromagnetic energy. Conventional ovens heat the outside of the container through hot air and direct radiant heat. These conditions place different stresses on glass and plastic.

Never move an OXO measuring cup from the microwave to:

• A gas or electric burner
• A broiler
• A toaster oven
• A grill
• An oven, unless the product instructions specifically allow it

Also, do not use a plastic measuring cup for oven cooking simply because it is microwave safe. Plastic can soften, warp, melt, or release odors when exposed to oven temperatures.

What to Do If an OXO Measuring Cup Cracks in the Microwave

Stop the microwave at once if you hear a sharp pop or see a crack. Allow the cup and contents to cool before touching them.

If the glass breaks:

1. Unplug the microwave if it is safe to do so.
2. Keep children and pets away from the area.
3. Wear cut-resistant or heavy work gloves.
4. Remove large pieces with care.
5. Wipe the interior with a damp disposable towel.
6. Check for small glass fragments before using the microwave again.
7. Discard food that may contain glass.

Do not keep using a cup with a chip, crack, or rough edge. Damage can spread during the next heating cycle.

If the cup did not crack but became unusually hot, warped, discolored, or smelled strongly of plastic, stop using it for microwave heating. Contact OXO or the retailer with the product name and model details.

Frequently Asked Questions

Are all OXO measuring cups microwave safe?

No. Many OXO glass measuring cups are microwave safe, but not every OXO measuring tool has the same material or care instructions. Stainless steel models are not microwave safe, and plastic models require model-specific confirmation.

Can I microwave an OXO measuring cup with a lid?

Only if OXO says the lid is microwave safe and gives instructions for using it. Do not microwave a tightly sealed lid. Steam pressure can build inside the container.

Can an OXO plastic measuring cup melt in the microwave?

It can warp, soften, or become damaged if it is not designed for microwave use or if it is exposed to excessive heat. Check the exact product instructions before heating plastic.

Is an OXO glass measuring cup safe for boiling water?

A microwave-safe glass cup may be suitable for heating water, but boiling water creates a burn risk. Leave headspace, use short cycles, handle the cup with protection, and allow the water to settle before stirring.

Can I put a hot OXO measuring cup in cold water?

Avoid doing so, especially with glass. A sudden temperature change can cause thermal shock and break the cup.

Bottom Line: Are OXO Measuring Cups Microwave Safe?

Many OXO glass measuring cups are microwave safe, but the answer is not universal for every OXO measuring cup. Confirm the exact model, material, and care instructions before heating it.

For the safest choice:

• Use only a cup marked microwave safe.
• Never microwave stainless steel.
• Check plastic models individually.
• Heat in short intervals.
• Leave room for expansion and steam.
• Replace damaged cups.
• Do not confuse microwave safe with oven safe.

If you cannot verify the cup’s instructions, transfer the food or liquid to a clearly labeled microwave-safe glass or ceramic container.

Sources and Verification

Product instructions and materials can change, so check the current model information before use:

• OXO Official Website
• OXO Product Support
• U.S. Food and Drug Administration: Microwave Cooking
• U.S. Department of Agriculture: Microwave Oven Safety