Backpack Weight Calculator

Is your hiking backpack too heavy? This pack weight calculator and backpacking weight calculator checks if your backpack weight is within the recommended range for safe hiking. Enter your body weight and pack weight, the calculator tells you your pack-to-body ratio and whether you need to lighten your load. Wilderness medicine guidelines recommend keeping your pack under 20% of body weight for day hikes and under 25% for multi-day backpacking trips.

75 kg
40 kg150 kg
12 kg
1 kg40 kg
16%
OK

Your pack weight is within safe limits.

20%25%
Your pack12 kg
Safe maximum (20%)15 kg
⚠

For reference only. Maximum pack weight guidelines are general recommendations, not medical advice. Carrying excessive weight risks back, knee, and hip injury. Consult a physiotherapist or outdoor specialist if you have existing injuries or concerns before carrying heavy loads on multi-day trips.

Where these numbers come from

The two thresholds, 20 percent of body weight and 25 percent, are taken from the NOLS Wilderness Medicine article on pack weight linked below. That article is a named, datable document, which is more than this site can say for some of the guidance it quotes, but we have not read the studies behind it and cannot tell you how the two figures were arrived at.

Ours: everything the calculator does with those two numbers. Calling the band between them a caution zone, reporting how many kilograms you would have to drop to get back under 20 percent, and treating the same two thresholds as applying to a day hike and to a multi day trip alike. The last one is a simplification. A pack you carry for six hours and one you carry for six days are not the same problem, and no source we have splits the thresholds that way, so we did not invent a split.

Source: NOLS Wilderness Medicine, Pack Weight Guidelines

Also useful: Estimate hiking time → · Calculate water needed →

Recommended Backpack Weight by Body Weight

Hiking pack weight chart by trip type. Find your body weight row and read across for the maximum recommended pack weight.

Body WeightDay Hike Max (15%)Overnight Max (20%)Multi-day Max (25%)Ultralight Target (10%)
50 kg / 110 lbs7.5 kg / 17 lbs10 kg / 22 lbs12.5 kg / 28 lbs5 kg / 11 lbs
60 kg / 132 lbs9 kg / 20 lbs12 kg / 26 lbs15 kg / 33 lbs6 kg / 13 lbs
70 kg / 154 lbs10.5 kg / 23 lbs14 kg / 31 lbs17.5 kg / 39 lbs7 kg / 15 lbs
80 kg / 176 lbs12 kg / 26 lbs16 kg / 35 lbs20 kg / 44 lbs8 kg / 18 lbs
90 kg / 198 lbs13.5 kg / 30 lbs18 kg / 40 lbs22.5 kg / 50 lbs9 kg / 20 lbs
100 kg / 220 lbs15 kg / 33 lbs20 kg / 44 lbs25 kg / 55 lbs10 kg / 22 lbs

Percentages are based on body weight. Day hike: 10-15%, overnight: 15-20%, multi-day: 20-25%. Ultralight backpacking weight targets sub-10%. These are maximum recommendations, lighter is always better for joint health and enjoyment.

What Should Be in Your Backpack?, Weight Breakdown by Category

Typical hiking pack weight by gear category, from day hike to ultralight backpacking weight setups.

CategoryDay HikeOvernightMulti-dayUltralight
Pack (empty)0.5–1.0 kg1.0–1.8 kg1.5–2.5 kg0.5–0.8 kg
Shelter, 1.0–2.5 kg1.0–2.5 kg0.5–1.0 kg
Sleep system, 1.0–2.0 kg1.0–2.0 kg0.5–1.0 kg
Clothing0.5–1.0 kg1.0–2.0 kg1.5–3.0 kg0.5–1.0 kg
Food0.5–1.0 kg1.0–2.0 kg0.8 kg/day0.6 kg/day
Water1.0–2.0 kg1.0–2.0 kg1.0–2.0 kg1.0 kg
Cooking, 0.3–1.0 kg0.3–1.0 kg0.1–0.3 kg
Safety/first aid0.3–0.5 kg0.3–0.5 kg0.5–1.0 kg0.2–0.3 kg
Typical total3–6 kg6–12 kg8–15 kg4–6 kg

Water weighs 1 kg per litre. Food averages 0.6-0.9 kg per person per day. These are the heaviest consumables, plan water refill points to minimize carried weight.

How Heavy Should a Hiking Backpack Be?

The general guideline is that your loaded backpack should weigh no more than 20% of your body weight for comfortable hiking. For a 75 kg person, that's a maximum of 15 kg. Beyond 25% of body weight, injury risk increases significantly, especially knee, hip, and lower back injuries on steep or uneven terrain. Military research shows that soldiers carrying more than 30% of body weight suffer dramatically higher rates of musculoskeletal injuries. For recreational hikers, lighter is always better: a 10 kg pack is more enjoyable than a 15 kg pack, regardless of what the guidelines "allow".

How to Reduce Pack Weight

The easiest ways to cut pack weight:

  1. Upgrade your "big three", pack, shelter, sleep system account for 40-60% of base weight. Modern ultralight versions save 2-4 kg total.
  2. Weigh everything, use a kitchen scale on every item. You'll find surprising weight in things you don't need.
  3. Eliminate duplicates, one knife, one light source, one set of spare clothes.
  4. Repackage consumables, transfer sunscreen, toothpaste, medicine into smaller containers.
  5. Plan water refills, carrying 3L when a stream is 2 hours away is unnecessary weight.
  6. Wear heavy items, boots and jacket on your body, not in your pack.

Estimate how many calories you'll burn on your hike with our hiking calorie calculator, this helps plan food weight accurately.

Effects of Heavy Backpacks on Your Body

Carrying too much weight while hiking increases risk of: knee pain and IT band syndrome (most common hiking injury), lower back strain and disc compression, ankle sprains from instability under heavy loads, blisters from increased foot pressure, and fatigue leading to poor decision-making. A study in the Wilderness & Environmental Medicine journal found that pack loads above 25% of body weight increase energy expenditure by 30-40% and double the risk of overuse injuries during multi-day treks. For high-altitude treks above 2500m, heavier packs increase altitude sickness risk, check our altitude sickness calculator.

How it works

Why pack weight matters

The 20 and 25 percent thresholds come from the NOLS Wilderness Medicine article linked at the foot of this page. We have not read the underlying studies, so treat the figures as that article's rather than as a measured finding we can vouch for. What it describes is pack weight above 20 to 25 percent of body weight increasing the risk of musculoskeletal injury, particularly to knees, ankles, and the lower back.

The guidelines

  • Up to 20% body weight: safe for most hikers on most terrain
  • 20–25% body weight: caution zone; acceptable for short routes and fit hikers
  • Above 25% body weight: high risk; injury risk increases sharply; not recommended

For a 70 kg hiker, 20% is 14 kg and 25% is 17.5 kg. Many recreational hikers unknowingly carry packs in the danger zone, particularly on multi-day trips.

These guidelines apply to hiking with a loaded pack over distance. Short carries or flat terrain are less risky than mountain routes with these loads.

Safe!Danger20%25%0%50%+

Frequently asked questions

How much should a day hike backpack weigh?

For a day hike, your pack should weigh 3-7 kg (7-15 lbs), which is typically 10-15% of body weight. This includes water (1-2L), food, rain jacket, first aid kit, and navigation tools. If your day pack exceeds 8 kg, you are probably carrying too much.

What is base weight vs total pack weight?

Base weight is everything in your pack MINUS consumables (food, water, fuel). Total pack weight includes consumables. Ultralight backpackers aim for a base weight under 4.5 kg (10 lbs). Base weight is useful for comparing setups because consumable weight varies by trip length.

How much should a backpacking pack weigh for a 3-day trip?

For a 3-day backpacking trip, target 10-15 kg (22-33 lbs) total, including 2-3 kg of food and 1-2L of water. Your base weight (without food/water) should be 7-10 kg for standard gear or 4-6 kg for ultralight setups.

Is 15 kg too heavy for hiking?

For a 75 kg person, 15 kg is exactly 20% of body weight, right at the recommended maximum. It is manageable for fit hikers on moderate terrain but will slow you down on steep or technical trails. If possible, aim for 10-12 kg for a more enjoyable experience.

How does pack weight affect hiking speed?

Every additional kilogram of pack weight reduces hiking speed by approximately 1-2%. A 15 kg pack slows you down roughly 15-20% compared to hiking with no pack. Use our Naismith's Rule calculator with the "Slow" pace setting when carrying heavy packs to estimate your route time.