Liquids & Luggage Weight Converter
Type the size printed on a bottle: see it in ml and fl oz, and whether it passes airport security where you fly from. Below, luggage weight in kg and lb.
100 ml = 3.38 fl oz · flying from the US
It passesCarry it in your quart-size bag. The TSA allows containers of 3.4 ounces (100 milliliters) or less.
- Milliliters
- 100 ml
- US fluid ounces
- 3.38 fl oz
- Limit here
- 100 ml / 3.4 fl oz
- The final decision rests with the TSA officer.
23 kg = 50.7 lb0.7 lb over 50 lb, the limit most US airlines set for an economy checked bag — and exactly 23 kg, the limit written in kilos.
Liquids rules from the TSA, GOV.UK and Your Europe, checked 2026-09-24. Every airline’s bag limits: the Bag Size Checker.
Quick answer: 100 ml is 3.38 US fluid ounces, and 3.4 fl oz is 100.55 ml, which is why the TSA writes its limit as “3.4 ounces (100 milliliters)”. Every container of liquid, gel, cream or aerosol in your carry-on must be that size or smaller and fit in one quart-size bag. For luggage, 23 kg is 50.7 lb, and 50 lb is 22.7 kg.
How to use it
Type the size printed on the bottle, in whatever unit it uses: 100 ml, 3.4 oz, 5 cl or 1 l. The tool converts it and tells you whether it passes security where you fly from — the US, the UK or the EU — for a toiletry or drink, a medicine, baby food or milk, or duty-free. Below it, type your bag’s weight in kg or lb to see it in the other unit and against the two limits airlines write.
The liquids rule where you fly from
| Flying from | Each container | All of them in | Rule |
|---|---|---|---|
| The US | 3.4 fl oz (100 ml) | one quart-size bag | TSA |
| The UK | 100 ml (up to 2 litres at some airports) | one transparent, resealable bag of up to a litre, about 20 cm × 20 cm | GOV.UK |
| The EU | 100 ml (more at some airports with CT scanners) | one transparent, resealable plastic bag of up to one litre | Your Europe |
The exceptions are the same idea everywhere: medicine, and baby food and milk, may be bigger. The TSA allows medically necessary liquids “in reasonable quantities for your trip” if you declare them at the checkpoint, and formula, breast milk, toddler drinks and baby food over 3.4 ounces do not need to fit in the quart bag. The UK allows up to 2 litres of each. The EU allows them for use during the trip, and you may be asked to prove a medicine is genuine.
Duty-free is the trap. Flying into the US with a connection, liquids over 3.4 oz bought abroad may stay in your carry-on only if the shop sealed them in a transparent, tamper-evident bag, you have the receipt, and you bought them within 48 hours. The TSA still recommends checking them.
Bottle sizes: fl oz to ml, and ml to fl oz
| On the bottle | In ml | Carry-on OK (TSA) |
|---|---|---|
| 1 fl oz | 29.6 ml | yes |
| 2 fl oz | 59.1 ml | yes |
| 3 fl oz | 88.7 ml | yes |
| 3.4 fl oz | 100.6 ml | yes |
| 4 fl oz | 118.3 ml | no |
| 5 fl oz | 147.9 ml | no |
| 6 fl oz | 177.4 ml | no |
| 8 fl oz | 236.6 ml | no |
| 12 fl oz | 354.9 ml | no |
| 16 fl oz | 473.2 ml | no |
| On the bottle | In US fl oz | Carry-on OK |
|---|---|---|
| 30 ml | 1.01 fl oz | yes |
| 50 ml | 1.69 fl oz | yes |
| 75 ml | 2.54 fl oz | yes |
| 100 ml | 3.38 fl oz | yes |
| 150 ml | 5.07 fl oz | no |
| 200 ml | 6.76 fl oz | no |
| 250 ml | 8.45 fl oz | no |
| 500 ml | 16.91 fl oz | no |
| 750 ml | 25.36 fl oz | no |
| 1,000 ml | 33.81 fl oz | no |
A US fluid ounce is exactly 29.5735295625 ml. The British fluid ounce is smaller, 28.41 ml, but bottles sold in the UK are marked in ml, so it rarely comes up.
Luggage weight: kg to lb
| Kilograms | Pounds |
|---|---|
| 7 kg | 15.4 lb |
| 8 kg | 17.6 lb |
| 10 kg | 22 lb |
| 15 kg | 33.1 lb |
| 20 kg | 44.1 lb |
| 23 kg | 50.7 lb |
| 25 kg | 55.1 lb |
| 30 kg | 66.1 lb |
| 32 kg | 70.5 lb |
| Pounds | Kilograms |
|---|---|
| 15 lb | 6.8 kg |
| 20 lb | 9.1 kg |
| 40 lb | 18.1 kg |
| 50 lb | 22.7 kg |
| 70 lb | 31.8 kg |
50 lb and 23 kg are not the same limit: 50 lb is 22.68 kg, so a bag of exactly 23 kg is 0.7 lb over. In the Bag Size Checker‘s airlines, American Airlines, Delta Air Lines, United Airlines, Southwest Airlines, JetBlue, Allegiant Air and Breeze Airways set 50 lb for an economy checked bag, and Frontier Airlines (40 lb) less; Air Canada, WestJet, Lufthansa, KLM, Turkish Airlines and Aer Lingus write theirs as 23 kg. If you weigh in pounds, stay under 50.
Pack it
For what goes in the bag around the bottles: the carry-on packing list, packing tips that make life easier and why packing feels so hard. Going somewhere specific? Hawaii and Japan have their own lists.
FAQ
What is the TSA liquid limit?
3.4 ounces (100 milliliters) per container, all of them in one quart-size bag, one bag per passenger. Anything bigger goes in checked baggage, except medicine, baby food and milk, which you declare at the checkpoint.
What is the 3-1-1 rule?
The TSA’s shorthand for its liquids rule: containers of 3.4 ounces or less, in 1 quart-size bag, 1 bag per passenger.
How many ounces is 100 ml?
3.38 US fluid ounces. That is why bottles made for travel are marked “3.4 fl oz / 100 ml” and both pass the TSA’s limit.
How many ml is 3.4 oz?
100.55 ml. Outside the US, security reads the milliliters, so check that the label also says 100 ml.
How many pounds is 23 kg?
50.7 lb. It is the kilo version of the checked-bag limit, but it is 0.7 lb more than 50 lb, the limit most US airlines weigh against.
How many kg is 50 lbs?
22.68 kg. A bag packed to 23 kg is just over it.
Can I bring medicine or baby formula over 3.4 oz?
Yes. The TSA allows medically necessary liquids in reasonable quantities for your trip and baby formula, breast milk and baby food over 3.4 ounces, outside the quart bag. Tell the officer at the start of screening.