Two walks, both graded moderate. One is a six-mile circuit on good paths through Derbyshire dales, with a pub at the end. The other is a six-mile haul across pathless Welsh bog with 700 metres of climbing and no obvious way off the hillside. Same word, very different days out.

Trail grades are shorthand, not a promise. They're written by different publishers for different audiences, and they assume a walker who may be fitter or slower than you. Here's what the labels tend to mean in the UK, and how to work out whether a route suits you.

The Three Grading Systems You'll Meet in the UK

Most walking in Britain is graded by one of three loose systems, and they don't always agree with each other.

• Guidebook and charity scales. Many guidebooks, walking festivals and charity challenge events use a four-step ladder: easy, moderate, strenuous, severe (sometimes called hard). A few split the bottom rung into "easy" and "leisurely".
• Colour codes. Green, blue, red and black come from trail centres and country parks, where green is a short surfaced loop and black is steep, technical and exposed. Walkers borrow the language, but there's no national walking standard behind it.
• Technical grades. On steep ground, scrambling is graded 1 to 3. Grade 1 needs hands occasionally; Grade 3 is sustained, exposed and close to rock climbing. Above that, it's a climb rather than a walk.

Long-distance paths such as the Pennine Way or Offa's Dyke Path aren't graded as a whole, because a single day of them varies enormously. Read the day-by-day notes instead.

What "Easy" Usually Means

Easy generally means a short day — under five or six miles — with modest ascent, often less than 200 metres, on paths that are obvious or waymarked. You shouldn't need a map to find your way, though carrying one is never a bad idea.

Easy is not the same as flat, paved or pushchair-friendly. Plenty of easy routes are muddy, stony and full of stiles and gates. An easy valley walk in the Lake District can still mean two hours on a rough track.

A useful test: could you finish it in trainers after a wet week, in daylight, with a phone map and no particular hill fitness? If yes, it's easy in practice.

What "Moderate" Really Means

Moderate is the broadest and least helpful label in the UK. It usually signals six to ten miles, perhaps 300 to 600 metres of ascent, some rougher ground, and four to six hours of walking including stops. You'll probably need to read a map at least once.

The trouble is that moderate is where publishers put everything that isn't a stroll and isn't a mountain epic. A gentle ridge in the Cheviots and a rocky traverse in Snowdonia can both carry the word.

When you see moderate, ask three questions:

• How much ascent? Three hundred metres is a different day from six hundred.
• How rough is the ground? Bog, scree and heather slow you down far more than distance suggests.
• How remote is it? A moderate route with a village every mile is forgiving. A moderate route with no exit for four hours is not.

What "Hard" Actually Involves

Hard — or strenuous, or severe — covers three quite different kinds of difficulty, and they don't always arrive together.

• Hard by distance. Twelve miles or more, often on a long-distance path. The challenge is stamina, time and tired legs.
• Hard by ascent. Nine hundred metres or more of climbing, or a route that goes up and down repeatedly through the day.
• Hard by terrain. Pathless ground, boulder fields, river crossings, sustained exposure, or Grade 1 scrambling where a slip would matter.

Add bad weather and a hard route becomes something else again. Wind and rain on an exposed ridge can turn a straightforward summer walk into a real test of nerve and kit. If a description says "hands on rock", "not for those who dislike exposure" or "navigation skills essential", believe it.

The Numbers Behind the Grade

Grades are adjectives; numbers are facts. Two figures will tell you more about a route than any label.

The first is total ascent. On UK hills, metres climbed matter more than miles walked. A rough working rule — Naismith's Rule, used by walkers for over a century — allows one hour per five kilometres on the flat, plus one hour for every 600 metres of ascent, then adds time for stops and steep descents. It badly underestimates bog and boulder fields, but it's a reasonable starting point.

The second is underfoot conditions. A mile of tarmac lane takes fifteen minutes. A mile of tussocky bog can take forty. Boardwalk, forest track and a well-drained fell path are quick; heather, scree and wet peat are slow. Guidebook times usually assume a fit walker moving steadily and rarely stopping to look at the view.

Matching a Route to Your Fitness and Experience

The most reliable gauge isn't a grade at all. It's the last walk you did.

1. Start from a route you finished comfortably, then compare distance and ascent. Fifty per cent more climbing will feel substantially harder, even if the mileage is the same.
2. Match the terrain, not just the stats. If you've only walked on made paths, a pathless moorland route will be tougher than the numbers suggest.
3. Be honest about navigation. Following a phone track works until the battery dies or the mist comes down. If you can't yet read a map and compass, choose routes with obvious paths and waymarks.
4. Think about the group. Walking with faster or slower companions changes the day more than the gradient does.
5. Plan for daylight. In December, a ten-mile hill route may not fit between sunrise and sunset at a relaxed pace.
6. Check the forecast and the ground. Wet rock, high wind and snow each push a route up a grade in practice.

If you have a heart condition, joint problems or another ongoing health concern, it's worth speaking to your GP before taking on noticeably harder days.

Before You Set Off

Treat the grade as the beginning of your research, not the end of it. Look at the ascent figure and the contour lines, read the route description properly, check the weather and the daylight hours, and pick a turnaround time you'll actually stick to.

Carry a map and compass you can use, a headtorch, waterproofs, and enough food and water for the day. Tell someone where you're going and when you expect to be back. Then the label matters much less, because you'll be making your own judgement on the ground.

Photo: GregMontani / Pixabay