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Calculate ground snow load to roof snow load with our easy calculator. Find flat and sloped roof snow loads using clear formulas and steps.
| Factor | Typical Default | Range Shown in Presets |
|---|---|---|
| Exposure Factor (Ce) | 1.0 — Partially exposed | 0.7 (windswept) – 1.2 (sheltered/wooded) |
| Thermal Factor (Ct) | 1.0 — Heated structure | 0.9 (continuously heated) – 1.3 (open air) |
| Importance Factor (Is) | 1.0 — Risk Category II | 0.8 (Cat. I) – 1.2 (Cat. IV) |
Snow can add a lot of weight to a roof. Our ground snow load to roof snow load calculator makes this math easy. Enter the ground snow load and key load factors. You’ll get the flat roof snow load at once. You can also add a roof slope factor for a sloped roof.
This tool helps you convert ground snow load to roof snow load with a clear roof snow load equation. It can help with quick checks, early plans, and roof load study.
Ground snow load is the snow load found on the ground. Roof snow load is the load used for roof design. They’re not always the same.
Think of it like this. A field may hold snow in one way. A roof may hold it in another way. Wind, heat, and roof use can change the roof load.
The calculator uses this flat roof snow load formula:
Pf = 0.7 × Ce × Ct × Is × Pg
Here, Pg is the ground snow load. Ce is the exposure factor. Ct is the thermal factor. Is is the importance factor. Pf is the flat roof snow load.
For a sloped roof, the calculator can also use:
Ps = Cs × Pf
Here, Cs is the roof slope factor. Ps is the sloped roof snow load.
The calculator doesn’t find these factors for you. You enter them. This keeps the math clear and easy to check.
Let’s say the ground snow load is 50 psf. Use Ce = 1.0, Ct = 1.0, and Is = 1.0.
Pf = 0.7 × 1.0 × 1.0 × 1.0 × 50
Pf = 35 psf
So, the flat roof snow load is 35 psf.
Now add a roof slope factor of Cs = 0.8.
Ps = 0.8 × 35
Ps = 28 psf
So, the sloped roof snow load is 28 psf.
This shows the full roof snow load calculation in a few steps. It can also help as a roof truss snow load calculator input check. For real design work, use the rules and load data for your site.
Our ground snow load to roof snow load calculator saves time and cuts down on hand math. It uses the core formula in the tool code. It gives a flat roof result and an optional sloped roof result.
Use a trusted site source for the ground snow load. A roof snow load chart, zip code tool, or address tool may help find that value. The exact design load may need more checks.
Ground snow load is the snow load set for the ground at a site. It’s the starting value in this calculator.
Use Pf = 0.7 × Ce × Ct × Is × Pg. Enter each factor, then solve for Pf.
Ground snow load is the site ground value. Roof snow load is the roof design value. The two values can differ.
Yes. The main result is the flat roof snow load, Pf.
The calculator doesn’t find the ground value by zip code. You must enter the ground snow load for the site.
The same rule applies. An address tool may give the ground value, but you still need to enter it here.
This tool finds load per area, such as psf. Total roof snow weight also needs the loaded roof area.
No. It’s a calculator. A roof snow load chart can help you find or compare load values.