How much cardio to lose weight

You've been told cardio melts fat — so you're grinding through hours on the treadmill and the scale won't budge. Here's the honest version: cardio is a useful fat-loss lever, but it's the support act, not the headline. Your diet creates the deficit; cardio helps you spend a bit more and protects your heart. This is exactly how much actually moves the needle — and where most people waste their effort.

Diet creates the deficit — cardio supports it

Fat loss comes down to one rule: you have to be in a calorie deficit — eating fewer calories than you burn. Cardio is one way to widen that gap, but it's a smaller lever than people think.

Why? Because you can out-eat almost any workout. A hard 45-minute run might burn 400-500 calories — roughly one flapjack and a flat white. Five minutes of eating can undo an hour of effort. That's why "I'll just train it off" rarely works.

So the order matters: get your nutrition right first, then add cardio to support it. If you haven't set your numbers yet, start with calorie deficit explained and how to lose fat, then work out your daily target with how many calories to lose weight.

How much cardio actually helps

Here's what the evidence supports. The NHS recommends at least 150 minutes of moderate activity (or 75 minutes of vigorous) a week for general health. For fat loss specifically, the ACSM position stand found that 150-250 minutes a week produces only modest weight loss — and that more than 250 minutes a week is associated with clinically significant loss, especially when paired with a sensible diet.

So a realistic, useful target for fat loss is:

• Floor: 150 minutes/week (the health minimum — about 30 minutes, 5 days).
• Effective: 200-300 minutes/week of moderate cardio, combined with a calorie deficit.
• Diminishing returns: beyond that, recovery and hunger usually undo the extra burn.

You don't have to white-knuckle it. Most of that can be brisk walking. Want to see what a session actually costs you? Drop your numbers in below.

Steps and NEAT vs structured cardio

The most underrated fat-loss tool isn't on a machine — it's walking. Daily steps and general movement (NEAT — non-exercise activity thermogenesis) often burn more over a week than your workouts, and they barely dent your recovery or appetite.

A simple hierarchy:

1. Steps first. Build towards 8,000-10,000 a day. It's sustainable, low-stress and adds up.
2. Then easy structured cardio. Low-intensity work — the kind you can hold a conversation through. Our zone 2 training guide covers this aerobic sweet spot.
3. A little intensity, optional. Short, hard intervals burn calories in less time but cost more recovery. Use them as seasoning, not the main meal.

Pick what you'll actually repeat. The best cardio for fat loss is the one you'll still be doing in three months.

Why cardio alone strips muscle — and how to keep it

Here's the trap. Lose weight on cardio and a deficit alone, and a chunk of what you lose is muscle — the very thing that keeps you looking lean and toned rather than smaller-but-soft. Lose muscle and your metabolism dips, making the next kilo harder.

The fix is non-negotiable: keep lifting while you lose fat.

• Strength train 2-3 days a week to signal your body to hold onto muscle (the NHS recommends strength work on at least 2 days regardless).
• Eat enough protein — roughly 1.6-2.2 g per kg of bodyweight. Check yours with the protein calculator.
• Treat cardio as the support lever, not the whole plan.

Do this and you lose fat, not tone. It's the same principle behind body recomposition — and the reason crash-cardio leaves people skinny-fat.

A realistic weekly template

Pull it together and a sustainable fat-loss week looks like this:

• 3 strength sessions (full-body or upper/lower) to protect muscle.
• 2-3 cardio sessions of 30-45 minutes, mostly easy-paced — 150-250+ minutes total.
• 8,000-10,000 steps most days as your quiet, always-on burn.
• A modest calorie deficit with enough protein, so you lose fat, not muscle.

Expect a realistic 0.5-1% of bodyweight per week. Faster than that and you're usually burning muscle and willpower you can't sustain.

Most people don't fail because they did too little cardio — they fail because they hammered cardio, ignored their diet and starved their muscle. That's the whole point of the Method: get the deficit right, use cardio as a lever (not a punishment), and keep a coach adjusting the plan as your body changes. Want it built around your life and done with you? The Fat Loss programme is designed for exactly this — lose the fat, keep the muscle, without living on the treadmill.