---
title: "15 tsp to cup = 0.3125 cup"
description: "15 teaspoons is 0.3125 US cups. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/15-teaspoons-to-cups/
site: "At One Place"
---

# 15 tsp to cup

**15 teaspoons in US cups: 15 tsp = 0.3125 cup**

cup = tsp × 1/48

15 teaspoons is 0.3125 US cups. To get there, multiply by 0.02083333333.

## Values either side

*Teaspoons near 15, converted to US cups.*

| Teaspoons | US cups |
| --- | --- |
| 11 tsp | 0.22917 |
| 12 tsp | 0.25 |
| 13 tsp | 0.27083 |
| 14 tsp | 0.29167 |
| 15 tsp ← | 0.3125 |
| 16 tsp | 0.33333 |
| 17 tsp | 0.35417 |
| 18 tsp | 0.375 |
| 19 tsp | 0.39583 |

## How the conversion works

The relationship is cup = tsp × 1/48. Both units measure volume, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

> US cup: US legal cup is 240 mL; the customary cup used here is 236.588 mL.

## Common questions

### What is 15 tsp in US cups?

15 tsp is 0.3125 cup.

### How do you convert teaspoons to US cups?

Multiply by 0.02083333333.

## Related pages

- [Teaspoons to US cups](https://atoneplace.net/convert/teaspoons-to-cups/)
- [15 cup to tsp](https://atoneplace.net/convert/15-cups-to-teaspoons/)
- [11 tsp to cup](https://atoneplace.net/convert/11-teaspoons-to-cups/)
- [12 tsp to cup](https://atoneplace.net/convert/12-teaspoons-to-cups/)
- [13 tsp to cup](https://atoneplace.net/convert/13-teaspoons-to-cups/)
- [14 tsp to cup](https://atoneplace.net/convert/14-teaspoons-to-cups/)
- [16 tsp to cup](https://atoneplace.net/convert/16-teaspoons-to-cups/)
- [17 tsp to cup](https://atoneplace.net/convert/17-teaspoons-to-cups/)
- [18 tsp to cup](https://atoneplace.net/convert/18-teaspoons-to-cups/)
- [19 tsp to cup](https://atoneplace.net/convert/19-teaspoons-to-cups/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)