Estimate firewood for camping.
Firewood consumption is driven by burn rate, and burn rate depends on how big a fire you keep going. A small cooking fire consumes around 1.5 kg an hour, a comfortable group fire about 3 kg, and a large fire on a cold night 5 kg or more. Wood type matters as a weight correction rather than an energy one: hardwood and softwood contain similar energy per kilogram, but softwood is far less dense, so it burns through much faster and you need roughly a third more weight for the same number of hours. Most campers underestimate badly — a four-hour group fire for three nights is over 35 kg, or four typical bundles.
Burn rate
kg per hour = base rate x wood type factor
Total wood
Total kg = kg per hour x hours per night x nights
Check current fire restrictions before lighting any campfire — bans are common in dry seasons and penalties are significant. Never leave a fire unattended, keep water or a shovel to hand, and drown the ashes until cold to the touch. Many jurisdictions prohibit transporting firewood across regional boundaries to limit the spread of invasive pests.
Softwood is much less dense, so a kilogram of pine occupies far more volume and presents far more surface area to the flame than a kilogram of oak. It ignites easily and burns hot but fast. For a long evening fire, hardwood is worth the extra cost per bundle.
Usually not, and often you legally cannot. Moving firewood spreads invasive pests such as emerald ash borer, and many parks and states prohibit bringing wood in from outside a set radius. Buy locally at or near the campground and burn all of it before you leave.