As an Amazon Associate I earn from qualifying purchases.
Enter the gutter run, guard type and what you currently spend on cleaning to see how many sections you need, the total install cost and how long the guards take to pay for themselves. Micro-mesh performs best against pine needles and roof grit; perforated aluminium is the sensible default under hardwoods. Guards reduce cleaning frequency rather than eliminating it, and they do not fix undersized gutters or ice dams.
Gutter guard is measured along the same run as the gutter itself — the eaves, not the rakes. What changes the quantity is whether the guard comes in sections, in a roll, or is fitted in fixed lengths.
| Eave run | Guard needed | Gutter with 10% waste | Downspouts |
|---|---|---|---|
| 80 ft | 80 ft | 88 ft | 3 |
| 120 ft | 120 ft | 132 ft | 4 |
| 160 ft | 160 ft | 176 ft | 5 |
| 200 ft | 200 ft | 220 ft | 6 |
| 240 ft | 240 ft | 264 ft | 7 |
Guard is measured on the actual run rather than with a waste factor, because most types are cut to length on site with little offcut. Add a few feet for corners and for the sections at each end.
| Type | Keeps out | Weak against | Relative cost |
|---|---|---|---|
| Foam insert | Leaves | Grit, seeds, shingle granules | Lowest |
| Brush insert | Leaves | Needles, small debris | Low |
| Mesh screen | Leaves and larger debris | Fine grit, pine needles | Mid |
| Micro-mesh | Almost everything, needles included | Very little | Highest |
| Reverse-curve | Leaves | Overshoot in heavy rain | High |
It does not eliminate maintenance. Fine grit still gets through most types, needles defeat all but micro-mesh, and debris sits on top of any screen where it can block the flow into the gutter entirely. Treat it as reducing the frequency rather than removing the job.
The same run as the gutter — measured along the eaves, not the rakes. Most types are cut to length on site with little offcut, so add a few feet for corners and end sections rather than a full waste factor.
Micro-mesh keeps out the most, including pine needles, at the highest cost. Foam and brush inserts are cheapest and let grit and needles through. Match the type to what actually falls on your roof.
Some types are fitted by lifting the first course of shingles, which can. Check how a guard attaches before buying, and ask your roofer if the roof is still under warranty.
No. Fine grit gets through most types, debris sits on top of any screen, and every type needs occasional checking. They reduce the frequency; they do not remove the job.
Cleaning out the gutters before fitting guards? The gutter cleaning tool guide compares wands, blower kits and scoops.
Choosing a guard? Our DIY gutter guard buying guide compares micro-mesh, screen, brush and foam.
Not sure they pay off? Read are gutter guards worth it.
Need the whole roof at once? The free roofing calculator works out roof area, squares, shingle bundles, underlayment, drip edge, ridge cap and installed cost from one set of measurements.