Convert

Teaspoon to Millilitre

Exact answer: 1 tsp = 4.92892159 ml (exact defined factor)

Teaspoon and Millilitre describe the same quantity from the Volume family but come from different systems of units. The factor is defined exactly. Volume appears in the kitchen, in retail, in process engineering and with liquids of every kind.

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What do you want to convert?

From1 tsp

Result4.928922 ml

Factor1 tsp = 4.92892159 ml

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011 tsp = 4.928922 ml

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

Volume is robust for liquids. For dry ingredients it does not replace weighing because density and packing vary.

03Base unit: l

1 tsp = 0.00492892159 l. Then the value is converted through the base unit l into Millilitre.

Table

Teaspoon to Millilitre
Teaspoon	Millilitre
1	4.928922
2	9.857843
3	14.786765
5	24.644608
10	49.289216
20	98.578432

Formula

1 tsp = 0.00492892159 l. Then the value is converted through the base unit l into Millilitre.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Related conversions

Millilitre to Cupml → cupVolume Cup to Millilitrecup → mlVolume Litre to Millilitrel → mlVolume Millilitre to Litreml → lVolume

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Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Volume. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Teaspoon to Millilitre?

1 tsp = 4.92892159 ml

Which formula does Teaspoon to Millilitre use?

1 tsp = 0.00492892159 l. Then the value is converted through the base unit l into Millilitre.

What is the most common mistake?

Volume is robust for liquids. For dry ingredients it does not replace weighing because density and packing vary.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.