640 metric teaspoons in US customary teaspoons

Conversion

640 metric teaspoons is equivalent to 649.229235875385 US customary teaspoons.^[1]

Conversion formula
How to convert 640 metric teaspoons to US customary teaspoons?

We know (by definition) that: $1 brteaspoon \approx 1.01442068105529 usteaspoon$

We can set up a proportion to solve for the number of US customary teaspoons.

\frac{1 brteaspoon}{640 brteaspoon} \approx \frac{1.01442068105529 usteaspoon}{x usteaspoon}

Now, we cross multiply to solve for our unknown $x$ :

x usteaspoon \approx \frac{640 brteaspoon}{1 brteaspoon} * 1.01442068105529 usteaspoon \to x usteaspoon \approx 649.2292358753856 usteaspoon

Conclusion: $640 brteaspoon \approx 649.2292358753856 usteaspoon$

640 metric teaspoons is equivalent to 649.229235875385 US customary teaspoons

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary teaspoon is equal to 0.00154028799804688 times 640 metric teaspoons.

It can also be expressed as: 640 metric teaspoons is equal to $\frac{1}{0.00154028799804688}$ US customary teaspoons.

Approximation

An approximate numerical result would be: six hundred and forty metric teaspoons is about six hundred and forty-nine point two three US customary teaspoons, or alternatively, a US customary teaspoon is about zero times six hundred and forty metric teaspoons.

Units involved

This is how the units in this conversion are defined:

Metric Teaspoons

"A teaspoon is an item of cutlery, a measuring instrument, of approximately 5ml, or a unit of measurement of volume (usually abbreviated tsp.). The metric teaspoon as a unit of culinary measure is 5 mL,[12] equivalent to 5 cm3; that is, 1⁄3 UK/Canadian metric tablespoon, or 1⁄4 Australian metric tablespoon."

Wikipedia page of metric teaspoons

Us Customary Teaspoons

"In the United States one teaspoon as a unit of culinary measure is 1⁄3 tablespoon, that is, 4.92892159375 ml; it is exactly 1 1⁄3 US fluid drams, 1⁄6 US fl oz, 1⁄48 US cup, and 1⁄768 US liquid gallon and 77⁄256 or 0.30078125 cubic inches. For nutritional labeling on food packages in the US, the teaspoon is defined as precisely 5 ml."

Wikipedia page of US customary teaspoons

Footnotes

[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).

Results may contain small errors due to the use of floating point arithmetic.

Conversion

Conversion formula How to convert 640 metric teaspoons to US customary teaspoons?

Conversion in the opposite direction

Approximation

Conversion formula
How to convert 640 metric teaspoons to US customary teaspoons?