Are these hiking calculators free?

Yes — all calculators on HikeCalc are completely free to use with no account required.

How accurate are the results?

Results are estimates based on validated scientific formulas. Individual results vary based on fitness, terrain conditions, and weather. Use results as a planning guide, not a guarantee.

What is the Pandolf equation?

The Pandolf equation is a load-carriage formula developed for the US military that calculates metabolic rate based on body weight, pack weight, walking speed, and terrain gradient. It is widely used in sports science research and is more accurate than basic MET-based calorie estimates.

Free hiking calculators

Eight free tools for hikers and backpackers, built on real physiology and sports science research. From planning your route to choosing your gear — know before you go.

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Hiking Time Calculator

How long will your hike take? Three proven models give you a realistic range.

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Hiking Calorie Calculator

How many calories will you burn? Built on the Pandolf equation from sports science.

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Backpack Weight Calculator

Is your pack too heavy? Calculate your pack-to-body-weight ratio instantly.

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Sleeping Bag Calculator

What temperature rating do you need? Adjusted for altitude, shelter, and sleep style.

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Trail Difficulty Calculator

Easy, moderate, or strenuous? Get an objective difficulty score for any trail.

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Hiking Water Calculator

How much water to carry? Accounts for temperature, exertion, and body weight.

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Tent Size Calculator

What size tent do you need? Manufacturer ratings are almost always optimistic.

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Hiking Boot Fit Calculator

Your street shoe size is not your hiking boot size. Find your correct fit.

Built on real science

Every calculator on HikeCalc uses established, peer-reviewed formulas rather than generic estimates. Calorie burn is calculated using the Pandolf load-carriage equation — the same model used in US military and sports science research. Hiking time is estimated from a weighted blend of Naismith's Rule, Tobler's hiking function, and the Book Time method. Sleeping bag ratings follow the EN/ISO 23537 standard used by bag manufacturers worldwide. The tools were developed with input from physiotherapy practice, with particular attention to load thresholds known to increase injury risk on multi-day trips.

How to use these tools

Planning a hike

Start with the Hiking Time Calculator to get a realistic time estimate for your route, then use the Trail Difficulty Calculator to get an objective difficulty score. The model range shows the spread between optimistic and conservative estimates so you can plan your start time with a buffer.

Packing and nutrition

Use the Hiking Calorie Calculator to understand your energy demand, the Backpack Weight Calculator to check your load, and the Water Calculator to plan how much to carry. Keeping your pack under 20% of body weight meaningfully reduces fatigue and injury risk on longer trips.

Gear selection

The Sleeping Bag Calculator, Tent Size Calculator, and Boot Fit Calculator help you select gear matched to your actual conditions — not manufacturer marketing. Each tool explains the spec to look for when buying.

Frequently asked questions

Are these hiking calculators free?: Yes — all calculators on HikeCalc are completely free to use with no account required.
How accurate are the results?: Results are estimates based on validated scientific formulas. Individual results vary based on fitness, terrain conditions, and weather. Use results as a planning guide, not a guarantee.
What is the Pandolf equation?: The Pandolf equation is a load-carriage formula developed for the US military that calculates metabolic rate based on body weight, pack weight, walking speed, and terrain gradient. It is widely used in sports science research and is more accurate than basic MET-based calorie estimates.

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