Convert Ounce to Quarter (US)
Convert ounces to quarters (us) instantly. 1 ounce = 0.0025 quarter (us) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Quarter (US) to Ounce converter for the reverse conversion.
Units explained
Ounce
The (avoirdupois) ounce (oz) equals one-sixteenth of a pound, about 28.35 grams.
From Latin 'uncia', meaning a twelfth part.
US food portions, postal weights, and boxing weight classes.
Standardized as 1/16 of the international pound from 1959.
Quarter (US)
The US quarter equals one-fourth of a short hundredweight, 25 pounds (about 11.34 kg).
A 'quarter' of the US short hundredweight.
US agricultural and commodity weighing.
Defined within the US customary hundredweight system.
Ounce to Quarter (US) conversion formula
The relationship between ounces and quarters (us):
To convert ounces to quarters (us), multiply the value in ounces by 0.0025. To reverse, multiply quarters (us) by 400.0000003527.
How to use this converter
Type a value into the calculator. The result in quarters (us) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Quarter (US) to Ounce converter for the reverse direction.
Step-by-step: convert ounces to quarters (us)
- Write down the value in ounces (oz).
- Multiply that value by the factor 0.0025.
- The product is the equivalent value in quarters (us) (qr).
- To reverse, multiply the quarter (us) value by 400.0000003527.
Worked examples
Example 1 — Convert 1 oz to qr:
1 × 0.0025 = 0.0025 qr
Example 2 — Convert 100 oz to qr:
100 × 0.0025 = 0.2499999998 qr
Real-world example — Ruler-scale measurements
A 30-ounce school ruler converts cleanly to quarters (us) — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 oz × 0.0025 = 0.0749999999 qr
Real-world example — Hardware-scale dimensions
A 10-ounce fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between ounces and quarters (us) daily when mixing metric and imperial tools.
10 oz × 0.0025 = 0.025 qr
Real-world example — Postcard and small-object dimensions
A postcard is about 5 ounces wide. Converting to quarters (us) is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 oz × 0.0025 = 0.0125 qr
Ounce to Quarter (US) conversion table
Standard reference values for converting ounces to quarters (us):
| Ounce [oz] | Quarter (US) [qr] |
|---|---|
| 0.01 | 2.5e-5 |
| 0.1 | 0.00025 |
| 1 | 0.0025 |
| 2 | 0.005 |
| 3 | 0.0075 |
| 4 | 0.01 |
| 5 | 0.0125 |
| 10 | 0.025 |
| 20 | 0.05 |
| 30 | 0.0749999999 |
| 40 | 0.0999999999 |
| 50 | 0.1249999999 |
| 100 | 0.2499999998 |
| 500 | 1.2499999989 |
| 1000 | 2.4999999978 |
Frequently asked questions
How many quarters (us) is 1 ounce?
How do I convert ounces to quarters (us)?
How do I convert quarters (us) back to ounces?
How many quarters (us) is 100 ounces?
Popular weight unit conversions
Convert Ounce to other weight units
Show all Ounce conversions
Metric / SI (18 units)
Avoirdupois (14 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 oz = 0.0025 qr) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.