What is the best angle for solar panels?

For most fixed rooftop systems, the best year-round solar panel angle equals your latitude. A location at 35° latitude typically performs best with a panel tilt close to 35°, facing true south in the Northern Hemisphere.

How do I calculate solar panel tilt angle by location?

Enter your latitude, or let the calculator detect it from your location. The tool applies the standard tilt formulas used across the solar industry: year-round tilt equals your latitude, summer tilt equals latitude minus 15 degrees, and winter tilt equals latitude plus 15 degrees.

Should solar panels face true south or magnetic south?

Solar panels should face true south in the Northern Hemisphere and true north in the Southern Hemisphere, not magnetic south or north. Magnetic declination can shift a compass reading by up to 20 degrees depending on location, so true direction should be confirmed with a map or GPS app.

Does solar panel angle really affect energy output?

Yes, but the effect is more forgiving than most people expect. Being 10 to 15 degrees off the optimal tilt typically costs only 2 to 5 percent of annual output, while facing 90 degrees away from true south can cost 20 to 25 percent.

What is the solar panel angle for winter versus summer?

Winter tilt is steeper because the sun sits lower in the sky, typically latitude plus 15 degrees. Summer tilt is flatter because the sun is higher overhead, typically latitude minus 15 degrees. Spring and fall fall roughly in between, close to latitude itself.

Should I adjust my solar panel angle seasonally?

Seasonal adjustment is only practical for ground-mounted or pole-mounted racks with adjustable brackets. Most rooftop arrays are fixed at the roof pitch and are not adjusted, since the gain from seasonal tilting is usually only 3 to 7 percent of annual output.

Is a solar panel angle calculator accurate for any state?

Yes, the formulas are latitude-based rather than state-based, so they apply anywhere in the world once your latitude is known. A state simply acts as a shortcut, since every location within it shares a similar latitude range.

What happens if my roof pitch does not match the optimal tilt?

Most homeowners cannot change their roof pitch, and that is fine. A difference of up to 10 degrees from the calculated optimal angle usually results in less than 2 percent annual energy loss, so fixed roof-mounted systems remain a sound choice.

What is solar azimuth and why does it matter?

Azimuth is the compass direction a panel faces. In the Northern Hemisphere, true south (180 degrees) captures the most sunlight across the day. Facing east or west instead of south can reduce annual output by roughly 20 to 25 percent.

Can I use this calculator outside the United States?

Yes. The calculator works for any latitude worldwide, including the Southern Hemisphere, where it automatically switches the recommended direction to true north instead of true south.

How accurate is the energy loss estimate in this calculator?

The recommended tilt and direction figures are precise, latitude-based values used across the solar industry. The estimated output percentage is a simplified model built from published loss benchmarks rather than a full irradiance simulation, so it is best used to compare scenarios rather than to predict an exact utility bill.

Free Solar Tool

Solar Panel Angle Calculator

Find the best solar panel tilt angle and direction for your exact location — instantly, with a seasonal breakdown and an energy-loss estimate if your roof isn’t at the perfect angle.

Reviewed for accuracy: July 2026 · Formulas cross-checked against NREL and SEIA solar irradiance guidance

📍 Your Location & Setup

Latitude (° — negative for Southern Hemisphere)

Quick pick — solar panel angle by location

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Tilt goal

Year-Round (Fixed) Summer Winter Spring / Fall

Mount type

What if my actual roof tilt is different?—

What if my panels don’t face true south/north?—

☀️ Your Recommended Setup

27.0°

Recommended Tilt

Face True South
Azimuth: 180°

Hemisphere

Year

Mode

100%

Est. Output

🟢 Optimal — matches recommended tilt closely

At this latitude, a 27° tilt captures the most sunlight across the full year for a fixed rooftop array.

Estimated annual output vs. optimal100%

Set your fixed rooftop panels to 27° and confirm your roof faces true south.

What Is a Solar Panel Tilt Angle, and Why Does It Matter?

The solar panel tilt angle is the angle between your panel’s surface and the ground. Because the sun’s position shifts across the sky through the day and across the seasons, no single angle is perfect at every moment. A solar panel angle calculator solves for the best compromise: the tilt that captures the most usable sunlight over an entire year, or over a specific season if your rack is adjustable.

This matters because tilt is one of the few variables in a solar installation you can actually control before panels go on the roof. Get it close to right and a fixed rooftop array will perform within a few percentage points of a far more expensive tracking system — which is exactly why almost every residential solar installer relies on the same latitude-based formulas used in this calculator.

How to Calculate Solar Panel Tilt Angle by Latitude

Every major solar reference — from utility-scale engineering papers to residential installer guides — anchors the tilt angle to latitude. The three formulas used in this tool are:

Year-round fixed tilt: equal to your latitude, which is the standard rule installers use to balance summer and winter sun for the best annual total.
Summer tilt: latitude minus 15°, since the sun sits higher overhead in summer months.
Winter tilt: latitude plus 15°, since the sun sits lower on the horizon in winter months.

You can check this against a real example: a home near 34° latitude (roughly Los Angeles) has a year-round optimal tilt close to 34°, a summer tilt near 19°, and a winter tilt near 49° — a 30° swing between seasons that reflects how much the sun’s path actually changes.

So if you’re searching for a solar panel tilt angle calculator that reflects how installers actually size a fixed array, latitude is the number to start with — not your roof pitch, and not a generic “45 degrees is standard” rule you may have seen elsewhere.

Rule of thumb: being 10–15° off your optimal tilt typically costs only 2–5% of annual energy output. Being 90° off on direction — facing east or west instead of true south — can cost 20–25%. Direction matters more than exact tilt.

How Accurate Is This Calculator?

The tilt and direction figures above come directly from the latitude-based formulas used across the solar industry, so they’ll match what a solar installer would tell you for a standard fixed-tilt rooftop or ground-mount system. The estimated-output percentage is different: it’s a simplified model built from published loss benchmarks (roughly 3–5% for a 10–15° tilt miss, and 20–25% for a 90° direction miss), not a full irradiance simulation. Treat the tilt and direction numbers as precise, and treat the output percentage as a directional estimate — useful for comparing scenarios against each other, not for predicting your exact utility bill.

Two things this calculator intentionally does not account for: local shading (trees, chimneys, neighboring rooftops) and regional cloud cover. Both can move the real-world “best” angle by a few degrees, and both matter more to your actual output than a couple of degrees of tilt ever will.

Solar Panel Angle by Location: Why Latitude Beats “State Averages”

Many people search for solar panel angle by location expecting a single number per state, but latitude — not state lines — is what actually drives the math. Southern Texas and northern Texas can differ by several degrees of latitude, which changes the ideal tilt by a similar margin. That’s why this calculator lets you enter an exact latitude, detect it automatically from your device, or pick the closest major city as a shortcut.

Best Angle for Solar Panels: Fixed vs. Seasonal Adjustment

For most homeowners, the best angle for solar panels is whatever your roof pitch naturally provides, set as close as possible to the year-round latitude-based figure. Seasonal adjustment — physically re-tilting panels twice a year — is really only practical for ground-mounted or pole-mounted racks with adjustable brackets, and typically adds just 3–7% to annual output. For rooftop installations, a solid one-time fixed tilt is almost always the right call.

True South, True North, and Magnetic Declination

Panels should face true south in the Northern Hemisphere and true north in the Southern Hemisphere. This is not the same as where a compass points — magnetic declination can shift a compass reading by up to 20° depending on where you live. If you’re fine-tuning an installation, check your local declination with a mapping tool or GPS app rather than a compass alone.

Common Mistakes When Setting Solar Panel Angle

Using “45 degrees” as a universal default regardless of latitude.
Confusing magnetic south with true south, especially at higher latitudes where declination is larger.
Over-optimizing tilt while ignoring shading from trees, chimneys, or neighboring rooftops, which usually has a bigger impact.
Assuming seasonal adjustment is worthwhile for a fixed rooftop system when it physically cannot be re-tilted.

Solar Panel Angle Reference Table by Latitude

Location	Latitude	Year-Round Tilt	Summer Tilt	Winter Tilt

Values are approximate, based on standard latitude-derived tilt formulas. Local shading, roof geometry, and cloud patterns can shift the truly optimal angle slightly.

Frequently Asked Questions

Related Calculators

These tools pair well with solar and outdoor-planning decisions on DexoCalc: