Gutter sizing calculator

5-Inch vs 6-Inch Gutter Calculator for Aledo Homes

Estimate how much stormwater reaches one gutter run, then compare whether a 5-inch system is a reasonable starting point or whether 6-inch gutters, larger outlets, and downspout changes deserve a closer look.

Calculate a gutter plan
Use the roof section draining to this run, not total living area.
Enter feet along the fascia for this run.
Transparent runoff math

See the water volume before comparing gutter sizes

One inch of rain on one square foot equals about 0.623 gallons. The calculator applies that conversion to the roof section feeding one gutter run, then uses visible capacity signals to organize the 5-inch-versus-6-inch conversation.

This is a homeowner planning heuristic, not hydraulic engineering or a product specification. Rain intensity, gutter profile, slope, outlets, downspouts, roof geometry, and installation details still need inspection.

Review the roof-runoff conversion source
Roof sectionRain scenarioApprox. volume
800 sq ft1 inch498 gal
1,200 sq ft2 inches1,495 gal
2,000 sq ft3 inches3,738 gal

What pushes the comparison toward 6-inch gutters?

Large roof sections, steep pitches, multiple valleys, long runs, too much roof area per downspout, and repeat overflow all increase the reason to compare a larger gutter profile. The outlet and downspout plan matters just as much as the nominal gutter size.

For related checks, use the roof valley overflow guide and downspout placement guide.

Local questions

Questions homeowners ask before requesting a quote

Does this calculator prove that an Aledo home needs 6-inch gutters?

No. It organizes roof area, pitch, valleys, run length, downspouts, and overflow into a planning signal. A provider still needs to inspect the roofline, gutter slope, outlets, fascia, and discharge route.

How is roof runoff estimated?

The tool uses the standard volume conversion of about 0.623 gallons for one inch of rain on one square foot of roof area. Actual captured runoff can be lower because of wind, splash, and other losses.

Can gutter guards solve a high-capacity result?

Not by themselves. Guards can reduce debris, but they do not increase gutter, outlet, or downspout capacity. Repeat overflow should be diagnosed before choosing a cover.

Gutter scope planner

Turn a vague quote request into a cleaner gutter plan.

Use this planner to frame the request around Gutter sizing calculator. The more clearly the water path is explained, the easier it is for a provider to compare installation, guard, repair, and drainage options.

Roof water source

Which valley, roof plane, or missing gutter run creates the most visible water problem?

Discharge route

Where can the downspout send water without flooding the slab, walkway, patio, or landscape bed?

System fit

Does the project need new seamless gutters, guards, repair, larger downspouts, or drainage extensions?

Next step

Start with the water problem, not a sales pitch

Share the roofline, overflow point, missing gutter runs, and drainage concern. A cleaner request helps a provider understand what needs to be checked first.