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US fluid ounces to US cups (fl oz to cup)
Convert US fluid ounces to US cups: 1 fl oz = 0.125 cup. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 fl oz = 0.125 cup
US cups = US fluid ounces × 0.125 — reverse: US fluid ounces = US cups × 8
The factor is derived from the SI definitions of both units (base unit: L) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 fl oz = 0.625 cup
- 12.5 fl oz = 1.5625 cup
- 100 fl oz = 12.5 cup
US fluid ounces to US cups conversion table
| US fluid ounces (fl oz) | US cups (cup) |
|---|---|
| 1 | 0.125 |
| 2 | 0.25 |
| 3 | 0.375 |
| 4 | 0.5 |
| 5 | 0.625 |
| 6 | 0.75 |
| 7 | 0.875 |
| 8 | 1 |
| 9 | 1.125 |
| 10 | 1.25 |
| 15 | 1.875 |
| 20 | 2.5 |
| 25 | 3.125 |
| 30 | 3.75 |
| 40 | 5 |
| 50 | 6.25 |
| 75 | 9.375 |
| 100 | 12.5 |
| 200 | 25 |
| 250 | 31.25 |
| 500 | 62.5 |
| 1000 | 125 |
FAQ
How many US cups are in one fluid ounce?
1 fl oz = 0.125 cup. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert US fluid ounces to US cups?
Multiply the value in US fluid ounces by 0.125: US cups = US fluid ounces × 0.125. For example, 5 fl oz = 0.625 cup.
How do I convert US cups back to US fluid ounces?
Multiply by the inverse factor 8 (US fluid ounces = US cups × 8), or use the US cups-to-US fluid ounces page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=fl_oz_us&to_unit=cup_us - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"fl_oz_us","to_unit":"cup_us"} - Markdown: https://tttkmbb.com/conversion/fl-oz-to-cups.md · JSON: https://tttkmbb.com/conversion/fl-oz-to-cups.json (add
?value=for a result) · Units: /api/v1/units?quantity=volume - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.