Best Tent Footprint and Tarp Sizes
Footprint sizing is one of those “small” details that prevents big problems: punctures, abrasion, and the classic water-bath under your tent after a storm. This guide gives you a fast sizing rule, then practical templates for common tent sizes.
The 15‑second rule (most people get this wrong)
- Footprint: same shape as your tent floor, but slightly smaller so rain can’t pool and run underneath.
- Ground tarp under the tent: treat it like a footprint (also slightly smaller).
- Tarp for a porch / vestibule / cooking cover: bigger and pitched separately.
In this hub: Tents & Shelter — choose, set up, and keep your tent dry.
Footprint sizing formula
- Measure your tent floor (length × width).
- Subtract 2–4 inches (5–10 cm) from each dimension.
Example: tent floor 90″ × 52″ → footprint target about 86–88″ × 48–50″.
Why smaller matters
If your footprint sticks out beyond the tent floor, it can collect rain and funnel it under you.
Common footprint sizes (quick reference)
These are “typical” ranges; always measure your specific tent.
| Tent size | Typical floor size (L×W) | Footprint target (L×W) |
|---|---|---|
| 1P | ~82–90″ × 28–34″ | subtract 2–4″ each side |
| 2P | ~84–92″ × 48–54″ | subtract 2–4″ each side |
| 3P | ~86–96″ × 60–70″ | subtract 2–4″ each side |
| 4P | ~90–100″ × 80–90″ | subtract 2–4″ each side |
| 6P | often 100″+ × 90″+ | subtract 2–4″ each side |
Tarp sizing depends on what you’re doing
A) Tarp used as a groundsheet (under the tent)
- Same rule as footprint: slightly smaller than the tent floor.
B) Tarp used as a “porch” / vestibule cover
- You want coverage beyond the door.
- Start with at least 6–12 inches extra past where you’ll stand/sit.
C) Tarp used as a rain shelter (standalone)
- For 1–2 people: many campers like 8×10 ft as a versatile baseline.
- For a small group: 10×12 ft or larger.
Rule of thumb: bigger is better until it becomes annoying to pitch in wind.
Pick the material (and why it changes your sizing)
Polycro (window shrink film)
- Best for: ultralight backpacking.
- Tradeoff: less durable, can puncture on sharp rock.
- Sizing tip: cut slightly larger than target, then trim after one test pitch.
Tyvek
- Best for: durable DIY footprint.
- Tradeoff: heavier, noisier at first.
- Sizing tip: easier to trace and cut precisely.
Manufacturer footprint
- Best for: perfect match, grommets align, easy.
- Tradeoff: cost.
DIY footprint template (works every time)
- Pitch your tent at home on a clean surface.
- Lay your material under it.
- Trace the floor outline inside the edges.
- Cut and round corners.
- Test in rain (or with a hose) to confirm no edges stick out.
Reinforce high-wear corners
Add small patches at corners and pole-contact spots.
Mistakes that cause the “puddle under my tent” problem
| Mistake | What you notice | Fix |
|---|---|---|
| Footprint/tarp sticks out | Water collects and runs under floor | Trim 2–4″ smaller |
| Footprint too small | Floor abrasion at edges | Re-cut or upgrade material |
| Wrong shape (rectangle under tapered tent) | Corners poke out | Trace the actual shape |
| Pitched in a low spot | Moisture everywhere | Move to higher, better-drained ground |
Quick decision: Do you need a footprint at all?
- Yes if: rocky ground, lots of nights out, expensive ultralight floor, gravel pads.
- Maybe if: grass, sand, or you rarely camp.
- No if: you’re on soft duff and your tent floor is tough (still avoid sharp sticks).
Authority sources
- Leave No Trace and NPS guidance on campsite selection (high/drained spots reduce moisture issues and floor wear).
