Reviewed by Emily Carter, MSc, RD
Registered Dietitian & Hydration Research Specialist. Emily holds a Master of Science in Human Nutrition and has spent over a decade translating nutrition research into practical, evidence-based guidance for everyday health and athletic performance.
How Many Ounces in a Water Bottle? Quick Answer
Standard water bottle sizes: 12oz (355mL), 16oz (473mL), 20oz (591mL), 24oz (710mL), 32oz (946mL), 40oz (1.2L), 64oz (1.9L), 84oz (2.5L), 128oz (3.8L/1 gallon). The Mammoth Mug 2.5L = 84oz. The Mammoth Mini 1.5L = 51oz. For most adults, hitting a daily target of 64–96oz (2–3L) requires either multiple refills of a small bottle or one fill of a large bottle.
Our best insulated water bottle under $100 Canada has the top-rated picks at every price point.
See our Mammoth Woolly vs Stanley Quencher for a head-to-head breakdown.
For a full overview, see our best water bottles Canada.
Water Bottle Size Chart: Oz to mL Conversion
| Bottle Size (oz) | Millilitres | Litres | Common Use |
|---|---|---|---|
| 12 oz | 355 mL | 0.35L | Travel, kids |
| 16 oz | 473 mL | 0.47L | Standard single-serve |
| 20 oz | 591 mL | 0.59L | Gym single session |
| 24 oz | 710 mL | 0.71L | Short workout |
| 32 oz | 946 mL | 0.95L | Half-day |
| 40 oz | 1,183 mL | 1.18L | Popular "large" |
| 51 oz | 1,500 mL | 1.5L | Mammoth Mini |
| 64 oz | 1,893 mL | 1.9L | Most adults' drink target |
| 84 oz | 2,500 mL | 2.5L | Mammoth Mug — full day |
| 128 oz | 3,785 mL | 3.8L | Gallon jug |
How Many Oz Does Each Mammoth Bottle Hold?
Mammoth Mug 2.5L = 84oz One fill covers the full daily water target for most adults (general recommendation: 64–96oz/day depending on weight and activity).
Mammoth Mini 1.5L = 51oz One fill covers roughly half a day. Two fills = full day. Best for commuting, travel, and lighter activity days. For more, see our guide on 32 oz water bottle options. For more, see our guide on gallon water bottle Canada.
Mammoth Woolly 2.5L = 84oz Same as the Mug but vacuum insulated — keeps cold for 24 hours.
Mammoth Woolly 1.5L = 51oz Same as the Mini but insulated.
How Many Refills Do You Need?
| Bottle Size | Refills to Hit 64oz | Refills to Hit 84oz |
|---|---|---|
| 16oz | 4 | 5.25 |
| 24oz | 2.7 | 3.5 |
| 32oz | 2 | 2.6 |
| 40oz | 1.6 | 2.1 |
| 51oz (Mini) | 1.25 | 1.65 |
| 64oz | 1 | 1.3 |
| 84oz (Mug) | 0.76 | 1 |
The 84oz Mammoth Mug is the only size where one fill covers your full daily target with zero refills for most adults.
🛒 84 Ounces. One Fill. Done.
The Mammoth Mug 2.5L — 84oz of BPA-free, DEHP-free Tritan. Fill once at 8AM, finish by 6PM. Time markings in 500mL intervals. Canadian brand at Sport Chek.
What "Daily Target" Actually Means in Ounces
General guidelines (from all fluid sources including food):
- Women: ~91oz (2.7L) total daily
- Men: ~125oz (3.7L) total daily
From drinks specifically (subtracting ~20% from food):
- Women: ~73oz (2.2L)
- Men: ~100oz (3L)
Active adults add 16–32oz per hour of exercise.
The 84oz Mammoth Mug covers:
- ✅ The average woman's full daily drink target in one fill
- ✅ About 85% of the average man's target — one fill + a glass
🛒 Know Your Size. Pick the Right Bottle.
84oz all-day. Mammoth Mug 2.5L — BPA-free Tritan, leak-proof, time markings. Or go insulated: Mammoth Woolly 2.5L — 84oz, cold for 24 hours. Canadian brand since 2014. At Sport Chek.
See also: best water bottle in Canada
Related: best water bottle for college
Frequently Asked Questions
How many ounces is a standard water bottle?
The most common single-serve water bottle is 16.9oz (500mL) — the standard disposable plastic size. Reusable water bottles range from 12oz to 128oz (gallon). The Mammoth Mug 2.5L is 84oz.
How many oz should I drink a day?
Women: ~73oz from drinks. Men: ~100oz from drinks. Active adults add 16–32oz per hour of exercise. Use body weight (lbs ÷ 2 = daily oz target) as a quick personal estimate.
How many ounces is 2 litres?
2 litres = 67.6oz. The Mammoth Mug 2.5L = 84.5oz — 500mL (17oz) more than a standard 2L bottle.
Is 64 oz of water a day enough?
For a smaller, sedentary woman: approximately. For most active adults and men: no — 64oz (1.9L) falls short of the recommended 73–100oz from drinks. Use the water intake calculator for your personal target.
How many 16oz water bottles make a gallon?
8 × 16oz bottles = 128oz = 1 US gallon. The Mammoth Mug 2.5L (84oz) = about 5 standard 16oz water bottles.
What size water bottle should I get?
For all-day desk/office use: 84oz (Mammoth Mug 2.5L) — one fill covers the day. For commuting and travel: 51oz (Mammoth Mini 1.5L). For insulated cold water all day: Mammoth Woolly 84oz or 51oz.
How many ounces is the Mammoth Mug?
The Mammoth Mug 2.5L = 84.5oz. The Mammoth Mini 1.5L = 50.7oz. Both available at Sport Chek across Canada.
How do I convert oz to mL for water bottles?
Multiply oz by 29.57 to get mL. Example: 32oz × 29.57 = 946mL ≈ 1L. Or: divide mL by 29.57 to get oz. 2,500mL ÷ 29.57 = 84.5oz.
