The Data Behind Mental Load: What the Numbers Say About UK Families

Mental load is often described as something that's hard to measure because it's invisible, internal, and continuous. But researchers have been finding ways to make it visible for decades. And the picture the data paints is hard to argue with.

The ONS Time Use Survey: a national snapshot

The Office for National Statistics Time Use Survey is one of the most comprehensive UK datasets on how people allocate their time. Its findings on unpaid domestic work have been tracked over multiple years and broken down by gender, household type, employment status, and the presence of dependent children.

Here is what it shows:

• Women do nearly 50 minutes more unpaid household work than men every day

• When unpaid childcare is included, the gap widens: women average 207.9 minutes per day against men's 145.7 minutes

• That difference amounts to more than 7 hours per week

These figures are not outliers from a single year. They represent a persistent structural pattern that has remained broadly stable over time, even as absolute levels of unpaid work have fallen for both men and women.

The gap that doesn't close with children

One of the more striking findings in the ONS data is what happens when you add children to the picture. Adults in households with dependent children spend 78.8 minutes per day on unpaid childcare on top of their general household work. That is an additional 74.8 minutes compared to households without children.

But here's the thing: women's total household contribution barely changes depending on whether they have dependent children or not. Men with children actually do less household work than men without children in every time period measured. Having children doesn't increase men's household contribution. It adds childcare on top of an already unequal division.

The data also shows that while physical household work has declined steadily (families are using more services, more technology), the mental load the planning, tracking, and coordinating has not declined at the same rate. The gender gap in cognitive labour has remained.

What Planily's pilot data adds

Before its public launch, Planily ran an application process for an early pilot cohort. The survey data from those applicants adds a real-world signal to the ONS numbers:

• 93% reported that household coordination falls predominantly on one partner rather than being shared

• 64% described themselves as experiencing moderate overwhelm or higher when managing household coordination

• 46% specifically selected "moderately overwhelmed" as their level

These are people who had proactively sought out a coordination tool. The fact that 64% were already reporting significant overwhelm before using anything suggests the population experiencing this strain is far wider.

The tools people are using

The pilot survey also captured which tools families are currently relying on. The top answers were phone calendars, WhatsApp chats, and paper diaries. These are all individual tools none of them designed for shared household management, and none of them designed to reduce the cognitive work of the person doing the planning.

Research on interrupted work by Mark, Gudith and Klocke (2008) found that switching repeatedly between digital tools and tasks causes a 36% increase in stress and a 40% increase in frustration. The fragmentation isn't just inconvenient. It adds to the load.

Why the narrowing gap matters

The ONS projections show that the gap in unpaid household work is slowly, gradually narrowing. Households are actively working towards a more equal distribution. What the data also shows is that this is precisely the moment when a shared coordination system becomes most useful not when the imbalance is at its worst and entrenched, but when families are actively trying to change it and need a way to make the full picture visible to both partners.