How the pounds to ounces converter works

One large weight beside sixteen equal small weights

Enter a mass in pounds or ounces and the other field updates immediately. The centre control swaps the conversion direction.

One pound contains exactly sixteen ounces

The converter uses the international avoirdupois pound and ounce used for ordinary body, food, parcel and product masses. Their relationship is exact:

m_{\mathrm{oz}}=16m_{\mathrm{lb}},\qquad m_{\mathrm{lb}}=\frac{m_{\mathrm{oz}}}{16}

Because 16 is exact, any rounding comes only from the displayed decimal, not from the conversion factor.

Everyday conversion examples

A 2.5 lb bag weighs 40 oz. Multiplying a decimal pound value by 16 still gives an exact result.

A 5 lb parcel weighs 80 oz. This is useful when a shipping form asks for ounces.

A 24 oz package weighs 1.5 lb. For the reverse calculation, divide ounces by 16.

Check which ounce the source uses

The plain oz label here means an avoirdupois ounce. A fluid ounce measures volume, so it cannot be converted to pounds without knowing the substance and its density.

Precious metals are commonly measured in troy ounces. A troy ounce belongs to a different system and should not be entered as ordinary oz.

Questions about pounds and ounces

These answers cover the exact factor, reverse conversion and the ounce types that are easy to confuse.

How many ounces are in one pound?

One international avoirdupois pound contains exactly 16 avoirdupois ounces.

How do I convert pounds to ounces?

Multiply the number of pounds by 16.

How do I convert ounces to pounds?

Divide the number of ounces by 16.

Is 8 ounces half a pound?

Yes. Eight avoirdupois ounces equal exactly 0.5 pound.

Does this converter work for fluid or troy ounces?

No. It uses ordinary avoirdupois ounces for mass, not fluid ounces or troy ounces.

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Calcopedia (en) → Pounds to ounces

Pounds to ounces converter