PACK THE
RIGHT
WATER.
The only camping water calculator built for Canadian conditions. Real math. Metric units. Provincial climate zones baked in.
Run Your Numbers.
Adults, kids, dogs, days — then your activity and climate. Litres, container math, and carry weight update live as you go.
Most Campers
Get The Math Wrong.
"Two litres a day" is American lifestyle advice. It was never built for a humid Ontario portage or a Rockies ridge in July.
The popular rules of thumb collapse the moment conditions change. They ignore exertion, they ignore heat, and they ignore the simple fact that a dog, a toddler, and a backpacker all drink differently. The result is the same every season — coolers run dry on day three and someone ends up filtering questionable lake water at dusk.
CampingHour does the real arithmetic for you. Plug in your group, your activity, and your climate zone, and you get an honest litre figure — plus the weight you'll actually be hauling. Start with the water calculator, then read the Canada Guide for province-specific advice.
Small Habits, Dry Packs.
Campfire Tax
Cooking, coffee, and clean-up quietly eat 1–1.5L per person each day. Budget for the fire, not just for drinking.
The Heat Spike
A single hot, exposed afternoon can double intake. When a heatwave is forecast, bump your climate setting before you pack.
Don't Forget Fido
A medium dog needs roughly 0.5–1L a day, more on the trail. Always carry water for every set of paws too.
The 20% Rule
Always pack a fifth more than the math says. Spills, miscounts, and a delayed pickup are normal — running dry shouldn't be.
Read Before You Pack.
How Much Water Should You Actually Bring Camping?
The "two litres a day" rule is wrong for most trips. Here's the real formula — and why activity and climate change everything.
BC vs Ontario vs Alberta: Water Planning Is Different
Coastal rainforest, humid portages, and dry alpine air all demand different math. A province-by-province look.
The Camping Mistake That Ruined Our Algonquin Trip
We brought 14 litres for nine days. We needed 47. A first-person account of rationing by day four.
Water Planning,
Province By Province.
Canada isn't one climate — it's a dozen. A muggy August portage in Ontario and a dry alpine traverse in the Rockies pull water from you at completely different rates. Use these regional notes alongside the water calculator to dial in your numbers.
British Columbia
The coast is wet but deceptive — rainforest humidity keeps sweat from evaporating, so you feel cool while still losing fluid steadily. Interior BC and the Okanagan flip to hot, arid, and exposed in summer, where consumption climbs fast.
Treat coastal trips as Typical Summer and interior or alpine routes as Hot & Exposed. Glacial creeks are abundant in the backcountry but always filter.
Ontario
Algonquin and the near-north are portage country, and portaging is brutal, sustained exertion — often in 28°C heat with full humidity. This is where campers most underestimate, treating a canoe trip like a lakeside sit.
If your route has more than two portages a day, set activity to Backpacking and climate to Hot & Exposed. The water is everywhere, but it's tannin-stained and needs treatment.
Alberta
The Rockies bring altitude and dry air, a combination that quietly dehydrates you. You sweat less visibly at elevation but lose more through respiration, and the sun is far stronger above the tree line.
Add a margin for altitude on any trip above 1,800m. Mountain streams are reliable but cold-source glacial silt can clog filters — carry a backup.
Atlantic Canada
Fog and ocean breeze on the East Coast mask real exertion — Cape Breton's Highlands or the Fundy trails feel mild but the climbs are relentless. Humidity stays high right through the season.
Plan as Typical Summer with Day Hiking exertion for most coastal trails. Freshwater sources are plentiful inland; coastal sources may be brackish, so confirm before relying on them.
The Prairies
Saskatchewan and Manitoba grasslands offer almost no shade and serious daytime heat. Open badlands and prairie trails expose you to wind and sun for hours, and surface water is scarce and often unsafe.
Set climate to Hot & Exposed and assume you must carry every litre — don't count on finding clean water en route. Early starts beat the worst of the afternoon load.
The Territories
Yukon, NWT, and Nunavut bring long daylight, big temperature swings, and genuine remoteness. Cool nights mask how hard the sun works during 18-hour summer days, and resupply simply isn't an option.
Over-plan deliberately — keep the safety buffer on and add days to your estimate. Water is generally abundant in the backcountry but always treat it, and account for fuel to melt snow on shoulder-season trips.
Ready to run your numbers?
Take these regional factors back to the tool and get an exact litre figure for your group.
Honest Math,
No Email Wall.
base = adults × 3.5
+ children × 2.0
+ pets × 0.5
litres = base
× activity // 1.0–1.8
× climate // 1.0–1.5
× days
× buffer // 1.2 if on
weight_kg = litres // 1L = 1kg
bottles = ceil(litres)
jugs_10L = ceil(litres / 10)
It started on a Temagami portage
CampingHour began the summer a friend and I ran out of water on the third day of a Temagami canoe trip. We'd packed by gut feel — "that looks like enough" — and spent the rest of the route filtering tannin-brown lake water and rationing coffee. The math, it turned out, wasn't hard. We just never did it.
So I built the calculator I wish we'd had: a tool that takes your real group, your real activity, and the real climate you're heading into, and hands back an honest number of litres — and the weight you'll be carrying. No "two litres a day" hand-waving. You can try it right now on the home page.
The methodology
The base figures — 3.5L per adult, 2.0L per child, 0.5L per pet, per day — cover drinking, cooking, and clean-up combined, not just sips of water. From there we apply three multipliers: an activity factor for exertion, a climate factor for heat and exposure, and an optional 20% safety buffer that's on by default because running dry is the one outcome worth over-preparing against.
The factors are deliberately conservative and grounded in field experience across Canadian conditions, from coastal BC to Ontario portages to the dry Prairies. The Canada Guide explains how to pick the right settings for your province, and the water breakdown article walks through the reasoning in full.
Who built it
CampingHour is a one-person, made-in-Canada project built by a lifelong backcountry camper, not a gear company. It's free, it asks for no email, and it always will. If it saves you one dry afternoon, it's done its job. Found a bug or have a regional tip? Get in touch — and if you've made the same mistake we did, the Algonquin story might feel familiar.
Questions,
Tips, Corrections.
Spotted something off in the math? Have a regional tip we should fold into the Canada Guide? Or just want to tell us about a trip where the numbers held up? We read everything.
CampingHour is a small, independent project — there's no support queue and no chatbot, just a real person who camps. Expect a reply within a few days. In the meantime, the calculator and the field notes cover most of what people ask.
campinghour.com · Made in Canada 🇨🇦
We've got it and we'll get back to you within a few days. Happy trails.
Read Before
You Pack.
How Much Water Should You Actually Bring Camping?
The "two litres a day" rule is wrong for most trips. Here's the real formula — and why activity and climate change everything.
BC vs Ontario vs Alberta: Water Planning Is Different
Coastal rainforest, humid portages, and dry alpine air all demand different math. A province-by-province look.
The Camping Mistake That Ruined Our Algonquin Trip
We brought 14 litres for nine days. We needed 47. A first-person account of rationing by day four.
How Much Water Should You Actually Bring Camping?
Ask the internet how much water to bring camping and you'll get one answer over and over: two litres a day. It's clean, it's memorable, and for a huge number of Canadian trips it's flatly wrong. That number is drinking-water guidance for a sedentary adult in a temperate office — not a person hauling a canoe over a 1.5km portage in August humidity. If you pack to it, you will run short.
The real figure depends on four things the rule of thumb ignores entirely: who's in your group, how hard you'll be working, how hot and exposed the terrain is, and how many days you're out. Get those right and the math is simple. You can run the whole thing in a few seconds with the CampingHour water calculator, but it's worth understanding what's happening underneath.
Start with a real base, not a sip count
CampingHour starts every adult at 3.5 litres per day — and crucially, that figure covers drinking, cooking, and clean-up combined. The "two litres" rule only ever meant drinking. The moment you add coffee in the morning, a pot of pasta at night, and rinsing your hands and dishes, you're well past two litres before you've taken a single trail sip. Children come in lower at 2.0L, and dogs at roughly 0.5L per day — more when they're running the trail with you.
3.5L per adult, per day, is drinking + cooking + clean-up. It is not a target — it's the floor before exertion and heat are added.
Activity is the multiplier most people forget
Sitting at a car-camping site is a 1.0× day. Day hiking pushes you to roughly 1.4×, and sustained backpacking or portaging climbs to 1.8× — almost double the base. This is the single biggest source of underestimation we see. People imagine the lazy version of their trip (the campfire, the lake swim) and forget the three hard hours of carrying gear uphill in the sun. If your itinerary has real exertion in it, set the activity factor to match the hardest days, not the average ones.
Climate stacks on top
A cool, shaded forest site is 1.0×. A typical Canadian summer day is about 1.2×, and hot, exposed terrain — open prairie, alpine ridgeline, a sun-baked beach — runs to 1.5×. Heat and exposure don't just make you thirsty; they accelerate fluid loss through sweat and respiration whether you feel it or not. When a heatwave is in the forecast, bump this setting before you pack, not after you're already rationing.
Always add the 20% buffer
Spills happen. Someone miscounts. Your pickup runs two hours late. A fuel canister tips into your water bag. The 20% safety buffer exists because the cost of carrying a little extra is sore shoulders, and the cost of running dry is a genuine emergency. It's on by default in the calculator for exactly that reason, and we'd urge you to leave it on for any trip more than a few hours from resupply.
One litre of water weighs one kilogram. A four-day backcountry trip for two can easily mean 40kg+ of water alone — which changes how you pack, and whether you filter instead of carry.
Put it together
The full formula is: (adults × 3.5 + children × 2.0 + pets × 0.5) × activity × climate × days × buffer. It looks like a lot written out, but you never do it by hand — that's the whole point of the tool. Plug your trip into the calculator, check the weight figure as well as the litres, and if you're heading somewhere with distinct regional conditions, read the Canada Guide before you commit to a number. And if you want proof of what happens when you skip all of this, our Algonquin trip story is a cautionary tale worth your time.
Run your trip now
Group, activity, climate, days — get your exact litres and carry weight in seconds.
Camping in BC vs Ontario vs Alberta: Water Planning Is Different
One of the quiet flaws in most camping advice is that it pretends Canada is a single climate. It isn't. The water you'd carry for a foggy Vancouver Island trail and the water you'd carry for an Algonquin portage in a July heatwave are not remotely the same — and treating them the same is exactly how people end up rationing. Here's how the three biggest camping provinces actually differ, and how to set the calculator for each.
British Columbia: coastal cool is deceptive
The BC coast is wet, mild, and sneaky. Rainforest humidity keeps your sweat from evaporating, so you feel cool and comfortable even as you steadily lose fluid. People under-drink on the coast precisely because they don't feel hot. Interior BC and the Okanagan are the opposite story — genuinely hot, arid, and exposed through the summer, where consumption climbs fast.
Set coastal trips to Typical Summer and interior or alpine routes to Hot & Exposed. Glacial creeks make backcountry water plentiful, but always filter — and remember that cold glacial silt can clog a filter quickly.
Coast → Typical Summer (1.2×). Interior & alpine → Hot & Exposed (1.5×). Filter everything.
Ontario: the portage tax
Ontario is where we see the worst underestimation in the country, and the culprit is the portage. Carrying a canoe and packs across a 1.5km trail in 28°C with full humidity is brutal, sustained exertion — but campers plan as though a canoe trip is a relaxing paddle. It isn't, on the carry days. Those are 1.8× backpacking days whether you planned for them or not.
If your Algonquin or Temagami route has more than two portages a day, set activity to Backpacking and climate to at least Typical Summer, often Hot & Exposed. Water is everywhere in the near-north, but it's tannin-stained and needs treatment. There's a reason our Algonquin story is set here.
Alberta: altitude does the work quietly
The Rockies bring two things flat-country camping doesn't: altitude and dry air. At elevation you sweat less visibly but lose more fluid through respiration, and the sun above the tree line is far stronger than it feels. The dehydration is quiet, which makes it dangerous — you don't notice until you're already behind.
Add a margin for any trip above roughly 1,800m, and lean toward Day Hiking or Backpacking activity for mountain routes. Streams are reliable but cold and silty; carry a backup filter or treatment method.
In every province, the mistake is the same: planning for how the trip feels instead of how hard your body is actually working. Exertion and exposure, not the calendar, set your water needs.
Build the regional factor into your number
The point of all this isn't to memorize three provinces — it's to pick the right activity and climate settings for where you actually are. The full Canada Guide covers the Atlantic, the Prairies, and the Territories too, and the water breakdown explains the underlying math. Once you've got your settings, run them through the calculator and check the carry weight — that's the number that decides whether you carry or filter.
Set your province, get your litres
Pick the activity and climate that match your region and let the tool do the math.
The Camping Mistake That Ruined Our Algonquin Trip
We brought fourteen litres of water for a nine-day trip. By the math we should have brought forty-seven. I've thought about that gap a lot in the years since, because it's the cleanest example I know of how badly gut-feel packing can fail you — and it's the reason this whole site exists.
The plan was a nine-day loop through the Temagami backcountry, two of us, late August. We were experienced enough to be confident and not experienced enough to be humble. When it came to water, we did what most people do: we looked at the jugs in the garage, decided fourteen litres "looked like plenty," and loaded the canoe.
Day one to three: false confidence
The first stretch was easy paddling and we barely touched the supply. That's the trap — early abundance feels like proof you packed right. What we weren't accounting for was that the easy days were front-loaded, and the hard portages, the heat, and the cooking and clean-up were quietly drawing the level down faster than two relaxed paddlers ever notice.
Two adults × 3.5L × nine days is already 63L of base need. Even with abundant lake water to filter, our carried buffer of 14L was never going to bridge the gap on the dry stretches.
Day four: rationing
By the morning of day four we were down to a few litres and a hard truth. The portages had been longer and hotter than the map suggested, and we'd burned water on cooking we hadn't budgeted for. We started rationing — half cups of coffee, dishes "cleaned" with a wipe, skipping the midday drink to stretch the bottle. It's a miserable way to camp, and it makes every decision worse because you're slightly dehydrated for all of them.
We were lucky: Temagami is full of water, and we had a filter. So we spent the back half of the trip filtering tannin-brown lake water at every stop, hunched over a pump at dusk while the bugs found us. It wasn't dangerous. It was just bleak, and entirely avoidable.
What I'd do differently
Everything, honestly. I'd have set the activity factor to Backpacking for the portage days instead of imagining a leisurely paddle. I'd have set climate to Hot & Exposed for late August. I'd have left the 20% buffer on. And I'd have looked at the carry-weight number and made the obvious call: don't try to haul it all — plan to filter from the start, and carry enough to bridge the dry gaps with margin to spare.
The mistake wasn't bringing too little water. It was never doing the math at all. Fourteen litres "looked like plenty" — and looking is not a plan.
That trip is why CampingHour is a few seconds of honest arithmetic instead of a gut feeling. If you're heading anywhere near Ontario portage country, read the province-by-province breakdown first — it explains exactly why we got burned. Then learn the real formula, and most importantly, run your own trip through the calculator before you load the canoe. You can read more about why I built it on the about page.
Don't pack by gut feel
Do the math we skipped. Two minutes now beats four days of rationing.