Carry vs Total: Why Your Gapping Chart Is Probably Wrong

Your 7-iron does not go 165 yards. It might roll out to 165 on a July range at your club, on baked ground that has not seen rain since May, when you hit eleven of them and remembered the good one. What it actually does, in the air, in October, into a bit of breeze, off a wet lie, is more like 148.

That gap is why you keep coming up short. And it is why the gapping chart you built on a spreadsheet last summer is quietly sabotaging every approach shot you hit between September and April.

The range floor is lying to you

Most UK club golfers build their yardage book from one of three sources: the range, the course, or a launch monitor session. All three can give you total distance. Only one of them reliably gives you carry, and it is not the one most people use.

Here is the problem with range-based gapping. Driving range ground is compacted. It gets mown short, it gets driven over by the ball-collector twice a day, and it drains badly enough that clubs build them on the firmest bit of land they own. A ball landing on that surface at 4,500 rpm with a 45-degree descent angle will still skip and run, because the surface has the give of a car park.

Meanwhile the 14th fairway at your club in November has been rained on for six weeks. A ball landing there does not roll. It plugs a little, kicks forward eighteen inches, and stops. Your total distance on that hole is your carry distance, give or take.

So you stand on the tee with a chart that says 8-iron is 155, the pin is 152, you catch it reasonably, and you’re in the front bunker. Again.

Actual numbers from a real gapping session

I ran a set of mid-irons through a Garmin Approach R10 on a matted bay (the R10 is one of the more common budget units in UK club car parks, along with the Rapsodo MLM2PRO and the SkyTrak+). This is a 12-handicap swing, indoor session, ball speed and launch measured, carry calculated, and crucially the total figure here is the monitor’s model of roll on a neutral surface, not measured roll.

Club     Ball spd   Launch   Spin     Carry    Total    Roll
7i       118 mph    18.2°    6,400    152 yds  163 yds  11
8i       112 mph    20.6°    7,100    143 yds  152 yds   9
9i       105 mph    23.9°    7,900    132 yds  139 yds   7
PW        97 mph    27.1°    8,800    120 yds  125 yds   5

Look at the roll column. Eleven yards on the 7-iron, five on the pitching wedge. If you build your gapping from the total column, your 7-iron to 8-iron gap reads as 11 yards. Built from carry, it reads as 9. Small. But your 7-iron to PW gap reads 38 by total and 32 by carry. That’s a difference of six yards across four clubs, and it compounds every time you stack another club on top.

Now take those same numbers outside in Scotland in March. The roll column goes to roughly zero for the 9-iron and wedge, maybe two or three yards for the 7-iron on a fairway that has drained. The air is denser and colder, so shave another three or four yards off carry on top. Your 152-yard 7-iron carry becomes about 147, and it stops where it lands.

That is a sixteen-yard swing from the number on your chart.

What the tools actually give you, and where they quietly fudge it

This is the part that matters if you’re feeding your swing into an app and taking its word for anything.

Doppler units (Garmin R10, Rapsodo MLM2PRO in outdoor mode) track the ball for a fraction of its flight and extrapolate the rest. Carry is modelled, not measured. It’s usually good, within a few yards for mid-irons. Total distance is a model layered on top of a model: it assumes a landing surface and applies a roll coefficient. The R10 does not ask you what the ground is like. It cannot, so it guesses.

Photometric units (SkyTrak+, Bushnell Launch Pro, Foresight GCQuad) measure the ball at impact and simulate the entire flight. Same conclusion: carry is a physics model from very accurate impact data, total is that plus an assumption about turf.

Phone-camera swing apps are a different animal and need a harder look. Sportsbox 3D, Swing AI, HackMotion’s video features, the various “upload your swing” tools: these read your body, not your ball. They will tell you your hip sway is 4 inches and your shaft lean at impact is 6 degrees forward. None of them measure carry. Some of them will happily estimate distance from swing speed, and that estimate ignores strike quality entirely, which is the single biggest variable for a 16-handicapper. A 95 mph 7-iron swing struck out of the heel produces a very different ball than a 95 mph swing struck centre. The camera does not know which one happened.

If you want a fuller breakdown of which numbers on a launch monitor readout are measured versus derived, that’s worth reading before your next session: Launch Monitor Numbers and What They Mean. The measured-versus-modelled distinction runs through almost everything on the screen.

GPS and shot-tracking (Arccos, Shot Scope V5) measure total distance only, on the course, in real conditions. That is genuinely useful, and it is the one dataset most club golfers already have and ignore. But it is total, and it blends firm summer rounds with soggy winter ones into one average that describes neither.

Rebuild the chart around carry

Here’s what to actually do, and it takes one session plus a bit of arithmetic.

Get carry numbers, not totals. On a launch monitor, that means finding the carry column and using it. On the R10 and the Garmin Golf app, carry sits next to total on the shot list; it is easy to read the wrong one, especially since total is the bigger, more flattering figure. On SkyTrak+ you can set the course conditions in simulation mode, but for gapping purposes ignore that and take raw carry.

Hit ten of each club, bin the worst two, average the remaining eight. Do not bin the worst five. The whole failure mode here is building a chart from your best swing and then playing golf with your median one.

Then apply UK reality. Three adjustments, in order:

1. Cold air. Roughly 1 yard lost per 10°F below 70°F (21°C), for a mid-iron. A 7°C November morning is about 26°F below that baseline, so knock off about 2.5 yards on a 150-yard club. More on longer clubs, less on wedges.
2. Wet turf. Assume zero roll on anything with a descent angle above about 45 degrees, which is every iron from 7 down for most players. Your carry number is your total number.
3. Elevation and wind. Separate problem, but at least now you’re adjusting from a real baseline instead of a fantasy one.

A worked version for that 12-handicapper, same clubs, November at a parkland course in the Midlands:

Club   Range chart (total)   Winter carry number   Difference
7i     163                   149                   -14
8i     152                   140                   -12
9i     139                   130                    -9
PW     125                   118                    -7

Fourteen yards on the 7-iron. That is the difference between pin-high and the front edge, every single time, on every par 3 you play for six months of the year.

The practice that follows from this

Two things change once your chart is carry-based.

First, you’ll discover gaps you didn’t know you had. Carry gaps compress at the top of the bag and stretch at the bottom, because roll scales with descent angle. Lots of club golfers find their 4-iron and 5-iron carry within four yards of each other once roll is stripped out, while their PW and 52-degree sit fifteen apart. That’s a genuine bag problem, and no amount of practice fixes it. Take the chart to a fitter.

Second, and more useful: practise landing the ball on a number. Most range practice is “hit it as far as I can with this club,” which trains the top of your distance range and gives you no control over the bottom of it. If you know your 9-iron carries 130 and you want it to carry 118, you need a rehearsed three-quarter swing that you’ve hit fifty times, not a guess.

The drill that pays: pick one iron. Hit ten full, ten at what feels like 80 percent, ten at 60 percent. Record carry for each batch on whatever monitor you have. You will probably find your “80 percent” swing carries 94 percent of full, because feel and output are barely related. That gap between what you think you’re doing and what the ball does is exactly the thing worth closing, and a launch monitor is the only honest referee for it.

A caveat on soft-ground carry: on genuinely saturated winter fairways, a steeply descending iron shot can actually lose a yard or two to a plug-and-stop, so your effective total comes in fractionally under your measured carry. Don’t over-model it. Build from carry, play the number, and adjust from what you see.

Go and look at your Arccos data from last February. Then look at the chart taped inside your yardage book. If those two things disagree by more than about five yards on your scoring irons, you already know which one you’ve been trusting.