A BBC recipe calls for 250g of flour — that's 2 cups or 8.82 oz. A stick of butter is exactly 113g (4 oz / ½ cup). A standard can of coconut milk is 400mL (1.7 cups).

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Fitness & Gym

If your scale reads 85 kg, that's 187.4 lbs. A standard Olympic barbell weighs 20 kg (44 lbs). A 45 lb plate is 20.4 kg. Most US fitness apps track in lbs while European equipment shows kg.

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Shipping

USPS First Class has a 13 oz (368g) limit before bumping to Priority. FedEx international rates change at 0.5 kg, 1 kg, and 2 kg. A MacBook Air weighs 1.24 kg (2.73 lbs) — just over that 1 kg break point.

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Science & School

A US nickel weighs exactly 5 grams (0.176 oz) — used as a lab calibration weight. One liter of water weighs exactly 1 kg (2.205 lbs) at 4°C. Chemistry problems regularly require switching between grams and ounces.

Context

Metric vs Imperial: Who Uses What?

Why you need a converter often comes down to which system a recipe, scale, or app was built for.

🇦🇺 🇨🇦 🇩🇪 🇫🇷 🇧🇷 + 190 more

Metric (SI)

Used by most of the world

Weight: grams, kilograms
Volume: mL, liters
Scale: powers of 10
Used in: science, medicine, daily life

💡 70 kg = 154 lbs

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Imperial / US Customary

Used primarily in the USA

Weight: ounces, pounds
Volume: cups, pints, gallons
Scale: irregular fractions
Used in: cooking, body weight, road signs

💡 154 lbs = 70 kg

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United Kingdom

Uses both depending on context

Body weight: stones & pounds
Cooking: grams (metric)
Roads: miles, not km
Beer & milk: still in pints

💡 UK pint = 568mL, US pint = 473mL

Expertise

Quick Mental Math Shortcuts

No phone? These tricks get you close enough — at the grocery store, gym, or kitchen.

Weightkg → lbs

Double it, then add 10%

70 kg → ×2 = 140, +14 = 154 lbs
Exact: 154.32 lbs

Weightlbs → kg

Halve it, then subtract 10%

200 lbs → ÷2 = 100, −10 = 90 kg
Exact: 90.72 kg

Weightoz → g

Multiply by 28

8 oz → ×28 = 224 g
Exact: 226.8 g

Volumecups → mL

Multiply by 240

2 cups → ×240 = 480 mL
Exact: 473.2 mL

VolumeL → gallons

Divide by 3.8

20 L → ÷3.8 = 5.26 gal
Exact: 5.28 gal

Volumetbsp → tsp

Multiply by 3 (exact)

4 tbsp → ×3 = 12 tsp
Always exact

Reference

Everyday Weight & Volume Reference

Common items measured across all units — useful for cooking, shipping, and fitness.

Item	Grams	Ounces	Pounds	Kilograms
US nickel coin	5 g	0.18 oz	0.011 lbs	0.005 kg
Large egg	~57 g	~2 oz	0.125 lbs	0.057 kg
Stick of butter	113 g	4 oz	0.25 lbs	0.113 kg
Can of soda (12 fl oz)	~355 g	12.5 oz	0.78 lbs	0.355 kg
Standard loaf of bread	~680 g	~24 oz	1.5 lbs	0.68 kg
1 liter of water	1,000 g	35.27 oz	2.205 lbs	1 kg
Olympic barbell	20,000 g	705 oz	44.09 lbs	20 kg
Average adult (US male)	~89,800 g	~3,168 oz	~198 lbs	~89.8 kg

Item	Milliliters	Cups (US)	Tablespoons	Fluid oz
1 teaspoon	4.93 mL	0.021 cups	0.33 tbsp	0.17 fl oz
1 tablespoon	14.79 mL	0.063 cups	1 tbsp	0.5 fl oz
Shot glass (US)	44 mL	0.19 cups	3 tbsp	1.5 fl oz
Can of soda	355 mL	1.5 cups	24 tbsp	12 fl oz
Standard water bottle	500 mL	2.11 cups	33.8 tbsp	16.9 fl oz
1 pint (US)	473 mL	2 cups	32 tbsp	16 fl oz
1 liter	1,000 mL	4.23 cups	67.6 tbsp	33.8 fl oz
1 gallon (US)	3,785 mL	16 cups	256 tbsp	128 fl oz

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How We Ensure Accuracy

Every conversion uses factors defined by NIST and BIPM. For example, 1 pound = exactly 0.45359237 kg — fixed by international agreement in 1959. The kilogram itself was redefined in 2019 in terms of the Planck constant. We never round conversion factors; rounding only happens in the final displayed result.

NIST BIPM / SI Units Int'l Yard & Pound Agreement (1959) ISO 80000-1

Got questions?

Frequently Asked Questions

There are exactly 16 ounces (oz) in 1 pound (lb). This is defined by the avoirdupois system — the standard for everyday items in the US and UK. 2 lbs = 32 oz, 0.5 lbs = 8 oz.

Multiply by 2.20462. Example: 70 kg × 2.20462 = 154.32 lbs. Quick mental estimate: double it and add 10% (70 → 140 + 14 = 154).

US cup = 236.6 mL. Australian and UK metric cups = 250 mL. The difference is small for most cooking but matters in baking. Our converter uses the US standard.

Mass is the amount of matter (kg, lbs, g). Weight is technically the gravitational force on that mass. In everyday use, people say "weight" when they mean mass. Our converter handles everyday mass conversions.

Exactly 3 teaspoons = 1 tablespoon in the US customary system. 1 tablespoon = 14.79 mL. This ratio is the same in the UK and Australia.

Our factors are sourced from NIST and BIPM and accurate to 6+ significant figures — sufficient for most professional and scientific needs. For critical applications like pharmaceutical dosing, always cross-reference with official standards and consult a qualified professional.

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