Camping Water Calculator
A litre weighs a kilogram, which is the whole problem.
Work out Camping Water. A litre weighs a kilogram, which is the whole problem. States the assumption instead of hiding it.
Total water to carry or source
72 L
72 kg · 6 L per person per day
Water weighs a kilogram a litre, which is the constraint on foot: 72 kg is more than most people will carry, so anything beyond a day trip means treating water on route rather than carrying it. Heat and exertion both raise drinking needs sharply rather than gently — a hot day under load can double the cool, easy figure. Plan the resupply points before the volume.
How the Camping Water Calculator works
Water needed for a trip, scaled by group size, duration, exertion and climate, with the weight of it stated. Heat and effort both raise drinking needs sharply rather than gently.
Also known as: how much water to bring hiking · backpacking water planning · water per person per day camping · how heavy is three days of water
A litre weighs a kilogram
That is the constraint that shapes every trip on foot. Two litres a day for drinking alone is 2 kg per person per day, and a three-day supply for one person is around 12 kg before food, shelter or anything else goes in the pack.
Which is why beyond a day trip the answer is almost always to treat water on route rather than carry it. Planning around water sources is a more useful exercise than planning around pack capacity, and it is what determines a realistic route.
Vehicle-based camping changes the arithmetic completely, since weight stops mattering. There the constraint is container volume and how long stored water stays palatable, which is a different problem with different answers.
Heat and exertion raise needs sharply
The two-litre baseline is for a sedentary person in a temperate climate. Hard walking under load can double it, and heat multiplies again — a hot day at high exertion can push drinking needs past six litres.
The scaling is not gentle. Sweat rate rises steeply with both effort and ambient temperature, and it is the dominant loss path. Planning a hot trip on temperate figures is one of the more common ways people get into trouble.
Altitude adds a third factor that catches people out. Respiration rate rises and the air is drier, so more is lost through breathing — while altitude simultaneously suppresses thirst, removing the signal that would normally prompt drinking.
Treating water, and what each method misses
Boiling is the most reliable single method: reaching a rolling boil is sufficient at most altitudes, with a few minutes held above about 2,000 metres. It handles everything, and it costs fuel and time.
Filters handle protozoa and bacteria and generally not viruses, which are small enough to pass most pore sizes. Chemical treatment handles viruses but works slowly in cold water and struggles against cryptosporidium. Carrying two methods covers the gaps.
Clear fast-flowing water is not safe water. Giardia and cryptosporidium from livestock or wildlife upstream are invisible and tasteless, and a mountain stream is exactly the source people trust most and should not.
Where to go next
The Camping Water question rarely arrives on its own. These are the ones that usually come with it:
- Well Water Calculator — Recovery rate is the supply — the casing is just a buffer.
- Rain Barrel Calculator — One millimetre on one square metre is one litre.
- Volume Converter — An imperial pint is 20% larger than a US one.
- BMI Calculator — Body mass index with category and healthy weight range.
Not medical advice. This calculator gives a general estimate, not medical advice. It cannot account for your individual health, medical history, or medication. Talk to a qualified healthcare professional before acting on any result.
Frequently asked questions
How much water do I need per day camping?
Two litres a day is the common baseline for drinking alone, rising sharply with exertion and heat — a hard day in a hot climate can double it. Cooking and hygiene are on top.
How much does water weigh?
One kilogram per litre, exactly. That is the constraint on foot: a three-day supply for one person is around 12 kg before anything else goes in the pack.
Should I carry water or treat it?
Beyond a day trip, treat it. Carrying more than a few litres becomes the dominant weight, which is why planning resupply points matters more than pack capacity.
How much water for washing up?
About a litre per person per day covers cooking and washing up for most trips. Hygiene is the variable one, and it is where the total can be cut hardest if needed.
What are the signs of dehydration?
Dark urine, headache, and fatigue disproportionate to effort. Thirst lags behind actual need, so drinking to a schedule works better than drinking to thirst on a long day.
Does altitude increase water needs?
Yes — respiration rate rises and the air is drier, so more is lost through breathing. Altitude also suppresses thirst, which makes it a common place to get caught out.
How do I treat water in the field?
Boiling is the most reliable. Filters handle protozoa and bacteria but usually not viruses; chemical treatment handles viruses but works slowly in cold water. Many people carry two methods.
How long should water be boiled?
Reaching a rolling boil is sufficient at most altitudes, with a few minutes held above about 2,000 metres. The temperature does the work, not the duration.
Can I drink from a mountain stream?
Not reliably. Even clear fast water can carry giardia and cryptosporidium from livestock or wildlife upstream, and neither is visible or tasteable.
How much water for washing up?
About a litre per person per day for cooking and cleaning combined on most trips. Washing up water should be strained and scattered well away from any watercourse.
What is a hydration bladder worth?
Mainly that it encourages sipping steadily rather than stopping to drink, which measurably improves hydration on a long day. Volume monitoring is harder, which is the trade.
Does caffeine dehydrate you?
Not meaningfully at normal intakes — the fluid in a coffee more than offsets the mild diuretic effect. It is a persistent myth rather than a planning consideration.
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Related calculators
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Recovery rate is the supply — the casing is just a buffer.
OpenRain Barrel Calculator
One millimetre on one square metre is one litre.
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An imperial pint is 20% larger than a US one.
OpenBMI Calculator
Body mass index with category and healthy weight range.
Open