Quilt Layering Calculator
Calculate the combined temperature rating when stacking two quilts together. Extend your gear's usable range without buying new equipment.
Inner Quilt (Closest to Body)
Typically the warmer quilt with the lower temperature rating
Outer Quilt (On Top)
Typically the lighter quilt with the higher temperature rating
Outer quilt should be larger to avoid compressing inner quilt's loft
How Quilt Layering Works
Layering quilts is a popular strategy in the ultralight community. Instead of carrying one heavy cold-weather quilt, you can layer two lighter quilts to achieve similar warmth while maintaining versatility for different conditions.
The Layering Formula
The most commonly used formula for calculating layered quilt temperature comes from Enlightened Equipment:
Combined Rating = Inner Quilt Rating - ((70 - Outer Quilt Rating) / 2)
For example, a 20°F inner quilt with a 40°F outer quilt: 20 - ((70-40)/2) = 20 - 15 = 5°F
Best Practices for Layering
- Put synthetic on the outside: Synthetic insulation handles moisture better and won't compress as much from body weight.
- Ensure proper fit: The outer quilt needs to be large enough to drape over the inner quilt without compressing it.
- Consider draft management: Two quilts may mean more potential draft points. Use attachment systems or a wider outer quilt.
- Mind the weight: Two quilts may weigh more than one equivalent cold-weather quilt. Do the math before committing to this strategy.
When to Layer vs. Buy a Warmer Quilt
Layering makes sense when:
- You already own multiple quilts and want more versatility
- You frequently encounter varying temperatures on the same trip
- You want the option to use quilts separately on warmer nights
- You're on a budget and can't afford a dedicated cold-weather quilt
A dedicated cold-weather quilt is better when:
- You're primarily doing winter camping
- Weight is your absolute priority
- You want the simplest possible setup
- You're willing to invest in purpose-built gear