How to Read Slope (and When to Ignore It)

Slope adjusted yardage tells you how far a shot will play, not how far away the target is. Uphill shots play longer. Downhill shots play shorter. Your rangefinder measures the angle between you and the flag and does the math for you. Here is how to read that number, and how to apply it to the whole green, not just the pin.

Two numbers, two meanings

With slope on, you see two readings:

• Line-of-sight distance: the actual measured distance to the flag.
• Slope adjusted distance: the "plays like" number after accounting for elevation change.

A common rule of thumb is to add roughly one yard for every three feet of rise, and subtract about the same for a drop. A flag 150 yards away that sits 20 feet above you might play around 157. Your rangefinder calculates this from the measured angle so you don't have to estimate.

Turning the slope number into a club

1. Laser the flag with slope on. Note both numbers.
2. Find the difference. If the line-of-sight reading is 150 and the slope number is 157, the hill is worth 7 yards.
3. Club for the slope number. Pick the club you hit 157 yards on flat ground.
4. Then adjust for what slope doesn't know. Wind, temperature, a firm or soft landing area, and your lie are still on you.

Apply the slope to the whole green

This is where connected features make a real difference. On a Swingman rangefinder paired with TheGrint, the lens also shows Front, Center, and Back distances to the green (with an annual Pro membership). Those numbers come from GPS course mapping, so they are flat, map-based distances. They do not include elevation.

The fix is simple: carry the same slope adjustment over to the green numbers.

Now you know the real carry to clear the front and the real room you have behind the pin. On an elevated green with a deep bunker short, that 147 matters more than the 157.

Use pin depth to choose your target

Slope tells you how far. Pin position tells you where. After you laser the flag, the lens shows where the pin sits on the green, front to back.

• Front pin, uphill: the shot plays long and the margin short of the pin is small. Club up and aim at the middle.
• Back pin, downhill: the ball will release. Take less club and land it short of the flag.
• Middle pin, either way: club for the slope number and swing with confidence.

When to turn slope off

The Rules of Golf do not allow devices that measure elevation in competition unless the Committee's Local Rule permits it. Before any tournament or club event, flip the slope switch off and confirm the device shows plain distance only. Distances to the green and the flag are generally allowed unless a Local Rule says otherwise, so check the event's rules sheet.

In casual rounds, slope is one of the best course-management teachers there is. Use it to learn how your home course really plays, so you can make good guesses on days when it is switched off.

Frequently asked questions

What does slope adjusted yardage mean? It is the distance a shot will effectively play after accounting for the target being above or below you.

Are Front/Center/Back distances slope adjusted? No. They come from GPS course mapping. Apply the same uphill or downhill adjustment you see on the flag reading.

Is slope legal in tournaments? Only if the Committee allows it through a Local Rule. Turn it off unless the event says otherwise.