Is Your Blind Cord Safe? How to Check and Fix It

Blind cords are a genuine strangulation hazard to young children, not a minor safety footnote — a looped or long operating cord within reach of a cot, bed, or climbable furniture can catch around a small child’s neck quickly and silently, without necessarily making any noise a parent in another room would hear. This post walks through exactly how to check a specific window using our Blind Cord Safety Calculator, with real worked numbers, and what to actually do with the result once you have it. The short version, stated up front: cordless is the recommended choice in any home with young children, and a height check that comes back “fine” today doesn’t change that recommendation.

The two measurements you need

The calculator needs only two figures from the actual window: the mount height, meaning how high the headrail sits above the floor, and the cord length, meaning how far the operating cord or chain hangs down from it. Both are easy to measure with the same steel tape you’d use to size a blind — measure straight down from the headrail to the floor for the mount height, and separately measure the cord itself, fully extended, from where it exits the headrail to its lowest point. If the blind has more than one cord or chain — a lift cord and a separate tilt chain, say — measure and check each one individually rather than assuming the shorter of the two makes the whole window safe.

Worked example: a cord that fails the check

Take a headrail mounted 84 in above the floor with a 40 in cord. The cord’s lowest point sits at 44 in above the floor (84 minus 40). Against the calculator’s default 60 in benchmark for “well out of reach,” that 44 in end is well below the line, so the tool flags it as within reach and reports a safe maximum cord length of 24 in — the longest cord that would still clear the 60 in line on that same 84 in headrail. If this window is anywhere a child spends time, the tool goes further and recommends switching to cordless or motorised outright, rather than just shortening the cord.

Worked example: a cord that passes, and what that does and doesn’t mean

Shorten that same cord to exactly 24 in on the same 84 in headrail, and its lowest point now sits at exactly 60 in — right at the benchmark line, which the calculator treats as clearing it. The verdict changes to a simple reminder to keep any loose loop tied off. It’s worth being explicit about what this “pass” actually represents: it means this specific cord, at this specific length, on this specific headrail, sits at or above a general out-of-reach benchmark today. It does not mean the window is permanently safe regardless of what changes around it — a piece of furniture moved under the window, a growing toddler, or an older sibling looping the cord somewhere it doesn’t normally hang can all change the real risk without changing a single number in this calculation.

Worked example: a low headrail where no cord length is really safe

Mount height matters as much as cord length, and a low headrail can make the whole question moot. Take a headrail mounted only 60 in above the floor with a 40 in cord: the lowest point sits at just 20 in, deep within a small child’s reach, and the calculator’s safe maximum cord length works out to 0 in. In effect, no length of hanging cord clears the benchmark line at all on a headrail mounted that low — shortening the cord isn’t a real fix here, only removing the cord entirely is. This is exactly the scenario where switching to cordless isn’t one option among several, it’s the only option that actually solves the problem, regardless of whether you’ve ticked a “child’s space” box on any calculator.

Worked example: the same checks in metric

The same logic runs in metric against a 150 cm benchmark. A headrail at 240 cm with a 100 cm cord leaves the cord’s end at 140 cm — below the line, with a safe maximum of 90 cm reported back. Shorten that same cord to exactly 90 cm and its end sits at precisely 150 cm, right at the benchmark, which the calculator again treats as clearing it. The pattern is identical to the imperial examples above; only the unit and the specific numbers change.

Keeping a record of what you checked

Once you’ve measured and checked a window, jot down the mount height, cord length, and the calculator’s verdict somewhere you’ll actually find again — a notes app, a shared family document, or even a sticky note inside a nearby cupboard. This matters more than it might seem: it means a partner, a babysitter, or your future self doesn’t have to re-measure from scratch to know whether a given window has already been checked and fitted with a cleat, and it gives you a clear baseline to compare against if you ever suspect something’s changed, like a cord that seems to hang lower than you remember.

Why cordless stays the answer even when a cord passes

It bears repeating because it’s the single most important point in this whole topic: a calculator can only compare the numbers you give it against a general benchmark, at the moment you measure. It has no way to account for a chair dragged under the window next week, a dresser rearranged next month, or a toddler who’s simply grown two inches and can now reach a foot higher than when you last checked. For any window in a nursery, a child’s bedroom, a playroom, or a family living space, the recommended choice is a cordless, motorised, or wand-operated blind — removing the hazard at the source — rather than relying on a height check that’s only ever a snapshot of one moment. Our guide to cordless and child-safe blinds covers the cordless, motorised, and wand-operated options in detail if you’re replacing a corded blind outright.

If you can’t replace the blind right now

Where a full replacement isn’t immediately possible — a rental property, a budget that has to be phased, a blind that’s otherwise in good condition — use the calculator’s shortening figure as a genuine, if partial, improvement: shorten the cord to the reported safe maximum, then fit a cleat, tension device, or breakaway connector so the shortened cord is also physically secured rather than simply left shorter but still loose. Move any climbable furniture, cots, or beds away from the window as a second, independent layer of protection, since furniture placement changes the real risk just as much as cord length does. None of this is a substitute for cordless, but it is a meaningful reduction in risk while you work toward replacing the blind.

Why a check sometimes comes back worse than you expected

People are often surprised the first time they actually measure, because a cord looks shorter from across the room than it measures with a tape. A common surprise is a headrail mounted lower than remembered — over a window seat, above a low sill, or in a converted attic room with a shorter wall height — which shrinks the safe maximum cord length dramatically even before the cord itself is considered, exactly as the 60 in headrail example above shows. Another common surprise is a cord that’s been lengthened at some point, perhaps by an added extension or a replacement cord that wasn’t cut to the original length, so it hangs lower than the blind’s original specification intended. Measuring the real, current setup rather than trusting a memory of how it looked when the blind was first installed is the only way to catch either of these.

What to tell a babysitter, grandparent, or visitor

Safety measures only work if everyone who spends time with a child knows about them, not just the parents who set them up. If you’ve fitted cleats or tension devices on corded blinds, show anyone who cares for your child where they are and how to use them, and make winding the cord onto the cleat an explicit instruction, not an assumption. If you’re visiting a grandparent’s house, a rental, or anywhere else with corded blinds you don’t control, it’s entirely reasonable to do a quick check yourself when you arrive — glance at cord length relative to any nearby furniture a child could climb, and temporarily tie up or move any cord that looks reachable, in the same spirit as checking for other hazards you wouldn’t normally think twice about in your own home.

Checking every window, not just the obvious ones

A thorough check covers every corded blind a young child could plausibly reach, not only the ones in a nursery or bedroom. Children roam through living rooms, kitchens, hallways, and play areas, and a corded blind in any of those spaces carries exactly the same hazard it would in a bedroom. Walk the whole home once, measuring each headrail height and cord length as you go and running each one through the calculator, and treat any window with young children spending real time near it — not just sleeping there — as a candidate for cordless regardless of what a single height check reports back. Make this walk-through a habit tied to a milestone you’ll actually remember — a house move, a new baby, a toddler starting to climb — rather than a one-off task you complete once and consider permanently settled.