Pick a tent and one or two sleeping pads and see exactly how they fit on the tent’s real floor shape, drawn to scale: the clearance at your head, your feet, each wall, and the gap between two pads. Built on published floor dimensions and pad specs. Data, not guesswork.
How it works
Pick your tent
Choose from 147 real backpacking tents, each with its published floor length and head/foot width, so the shape you see is the shape you sleep in.
Pick one or two pads
Select any of 133 sleeping pads for Pad A, and add a second, different pad for Pad B. The tool uses each pad’s real length, width, and shape.
See the fit
A top-down view drops the pads into the floor and measures the clearance at the head, foot, both walls, and between the pads. Auto-arrange snaps them into place, or switch to Drag to position them yourself. They can’t overlap or leave the floor.
Common questions
Will two sleeping pads fit in a 2-person tent?
It depends on the pads and the tent. Two 20-inch pads need 40 inches of floor width. Two 25-inch pads need 50. Many 2-person backpacking tents are 50 to 54 inches wide at the head but taper toward the foot, so wide pads can fit at the shoulders yet crowd at the feet. This tool places your two actual pads in the tent’s real floor shape and shows exactly how much room is left on every side.
Why does the tent narrow at the foot?
Most backpacking tents use a tapered (trapezoid) floor that is wider at the head and narrower at the foot, which saves weight and fabric. It rarely matters for your shoulders but it’s where pads actually run out of room, so this calculator models the taper instead of assuming a rectangle.
Does pad shape change the fit?
Yes. A mummy or tapered pad is narrowest at the feet, so two of them can nest into a tapered tent better than two rectangular pads of the same maximum width. The tool draws each pad’s real silhouette (rectangular, tapered, or mummy) and measures fit from its widest points.
How much clearance should I leave?
Any positive number means the pads physically fit the floor. A little spare width (an inch or two per side) makes it easier to get in and out and keeps pads off the sloping, condensation-prone walls. This tool flags a fit as “tight” when the smallest gap drops below about an inch.
Tent floor dimensions are sourced from manufacturer and retailer spec pages. Tapered floors use published head/foot widths (or a foot width derived from the published floor area). Pad sizes are the manufacturers’ published length and width. Fit is measured from each pad’s widest points, a real-world check rather than a guarantee for a specific tent revision.