Convert Milliliters to Teaspoons – Kitchen Converter
This converter translates volumes entered in milliliters (mL) into teaspoons (tsp) using a fixed mathematical relationship. It is designed for kitchen and general household conversions where a standardized teaspoon definition is acceptable.
By default the tool uses the commonly adopted US teaspoon value (1 teaspoon = 4.92892159375 mL). Small differences exist internationally and in informal measuring spoons, so read the accuracy and calibration notes below if you need higher precision.
Use this converter for recipe adjustments, cooking, and approximate dosing in non-medical contexts. For clinical or pharmaceutical dosing, follow product labeling and professional guidelines.
Governance
Record 1a4b1a791cf1 • Reviewed by Fidamen Standards Committee
Interactive Converter
Convert between milliliter and teaspoon with precision rounding.
Quick reference table
| Milliliter | Teaspoon |
|---|---|
| 1 mL | TSP 0.20 tsp |
| 5 mL | TSP 1.00 tsp |
| 10 mL | TSP 2.00 tsp |
| 25 mL | TSP 5.00 tsp |
| 50 mL | TSP 10.00 tsp |
| 100 mL | TSP 20.00 tsp |
Methodology
This conversion is a deterministic unit conversion based on an exact numerical factor for a standardized teaspoon. The relationship is fixed and reversible: teaspoons = milliliters / 4.92892159375.
Sources for the standardized factor come from international measurement authorities and pharmacopeial practice that define household measures in terms of milliliters. Where multiple local definitions exist, the US teaspoon is widely used as the default in digital converters.
Accuracy guidance: domestic measuring spoons and informal household teaspoons vary in volume. For precise work, use calibrated laboratory or pharmaceutical measuring devices and consult standards or local regulatory guidance.
Worked examples
1 mL ≈ 0.202884 tsp (1 ÷ 4.92892159375 ≈ 0.2028841362)
5 mL ≈ 1.014421 tsp (5 ÷ 4.92892159375 ≈ 1.0144206811)
15 mL ≈ 3.043261 tsp (15 ÷ 4.92892159375 ≈ 3.0432610212)
If you need tablespoons: 15 mL ≈ 1.014787 tablespoons (1 tablespoon = 14.78676478125 mL).
F.A.Q.
Which teaspoon definition does this converter use?
This tool uses the standardized US teaspoon definition where 1 teaspoon = 4.92892159375 mL. Some regions or consumer measuring spoons are different; see glossary for variant notes.
Is this accurate enough for medical dosing?
No. For medical or pharmaceutical dosing follow product labeling, a pharmacist's instructions, and pharmacopeial standards. Use calibrated dosing devices and consult applicable standards such as pharmacopeias and regulatory guidance.
Why do values differ slightly between converters or spoons?
Differences come from alternate historical or regional definitions (for example metric household spoons, imperial definitions, or nonstandard consumer spoons) and from user rounding. Use calibrated instruments when accuracy matters.
How should I round results for recipes?
For everyday cooking round to 1–2 decimal places for teaspoons (for example 1.01 tsp), or to the nearest common spoon measure used in your kitchen. For precision cooking or small-batch formulation, preserve more decimals.
Can I convert the other way, from teaspoons to milliliters?
Yes. Use the inverse formula: mL = tsp × 4.92892159375. Many interfaces provide two-way conversion; this converter is reversible with no loss in the underlying mathematical relationship, only in displayed rounding.
Sources & citations
- National Institute of Standards and Technology (NIST) - Physical Measurement Laboratory — https://www.nist.gov/pml
- International Bureau of Weights and Measures (BIPM) — https://www.bipm.org
- International Organization for Standardization (ISO) — https://www.iso.org
- United States Pharmacopeia (USP) — https://www.usp.org
- ISO 80000-3:2019 — Space and time — https://www.iso.org/standard/64974.html
- NIST SP 811 — Guide for the Use of the International System of Units — https://www.nist.gov/pml/special-publication-811
Further resources
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
Record ID: 1a4b1a791cf1What changed (latest)
v1.0.0 • 2025-11-23 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
What changed (latest)
v1.0.0 • 2025-11-23 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Engine
v1.0.0
Data
Baseline (no external datasets)
Content
v1.0.0
UI
v1.0.0
Governance
Last updated: Nov 23, 2025
Reviewed by: Fidamen Standards Committee (Review board)
Credentials: Internal QA
Risk level: low
Reviewer profile (entity)
Fidamen Standards Committee
Review board
Internal QA
Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person
Semantic versioning
- MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
- MINOR: New features or fields that do not change existing outputs for the same inputs.
- PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.
Review protocol
- Verify formulas and unit definitions against primary standards or datasets.
- Run golden-case regression suite and edge-case suite.
- Record reviewer sign-off with credentials and scope.
- Document assumptions, limitations, and jurisdiction applicability.
Assumptions & limitations
- Uses exact unit definitions from the Fidamen conversion library.
- Internal calculations use double precision; display rounding follows the unit's configured decimal places.
- Not a substitute for calibrated instruments in regulated contexts.
- Jurisdiction-specific rules may require official guidance.
Change log
v1.0.0 • 2025-11-23 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: d0f8f4f4b452