Lost Learning Hub

Pupil Lost Learning Calculator

Estimate the learning time lost by an individual pupil through absence, disruption and other recurring barriers to learning.

Section 01

Core assumptions

Set the shape of the school career you're modelling.

School days per academic year

Typical UK statutory minimum is 190 days.

Years in school

e.g. 4.8 for a KS3–KS4 window.

Taught hours per school day

Directed teaching time, not the total school day.

Lessons per school day

Number of discrete lesson periods.

Attendance %

Enter attendance as a percentage, e.g. 93.

Total taught hours (optional override)

If entered, overrides the calculated potential taught hours.

Section 02

Lost learning inputs

Adjust each factor to reflect your pupil, class or cohort.

Minutes lost per lesson through disruption

Low-level disruption, transitions, off-task behaviour.

Number of removals per year

Times the pupil is removed from lessons.

Hours lost per removal

Average duration of each removal, in hours.

Late arrivals to lessons per day

Number of lessons started late.

Average minutes late

Average minutes late per affected lesson.

Average take-up / adjustment time per lesson (min)

Settling and transition time at the start of each lesson.

Toilet visits per day

Lesson-time toilet visits.

Minutes per toilet visit

Time out of lesson per visit.

Suspensions per year

Fixed-term suspensions per academic year.

Average suspension length (days)

Average length of each suspension in school days.

Additional hours lost through respite / managed move / placement (per year)

Hours lost through short-term placements or respite arrangements.

Section 03

Results dashboard

Live totals across the modelled school career.

Total potential taught hours

4,560.0

hrs

Attendance adjusted hours

4,240.8

hrs

Total hours lost

1,668.1

hrs

Remaining learning hours

2,572.7

hrs

% of total curriculum lost

36.6%

% of available learning lost

39.3%

Learning time

Remaining vs lost

Contribution of each factor

School-life hours lost, largest first

Section 04

Detailed breakdown

Every factor, annual and career-long.

Factor	Annual hours lost	School-life hours lost	% of total curriculum	% of available learning
Disruption	73.6	353.4	7.8%	8.3%
Removal	190.0	912.0	20.0%	21.5%
Late Arrival	14.7	70.7	1.6%	1.7%
Take-up Time	29.5	141.4	3.1%	3.3%
Toilet Visits	14.7	70.7	1.6%	1.7%
Suspension	25.0	120.0	2.6%	2.8%
Respite	0.0	0.0	0.0%	0.0%
TOTAL	347.5	1,668.1	36.6%	39.3%
Remaining learning		2,572.7

Section 05

Equivalent learning lost

Translating the total into terms that resonate with governors, staff and families.

Equivalent school days

333.6

School days of learning lost

Equivalent teaching weeks

66.7

Teaching weeks of learning lost

Equivalent academic terms

8.6

Academic terms of learning lost

Equivalent full school years

1.8

Full school years of learning lost

Your results

Based on the assumptions entered, this pupil has access to approximately 4,240.8 hours of taught learning across their school career.

An estimated 1,668.1 hours are lost through attendance, disruption and other interruptions to learning, leaving approximately 2,572.7 hours of effective curriculum time.

This represents 36.6% of the total curriculum, or 39.3% of the learning time that the pupil was actually present for — the equivalent of approximately 1.8 full school years of learning.

Even relatively small interruptions to learning accumulate into substantial losses over time. This calculator demonstrates why improving attendance, reducing disruption and increasing instructional time can have a significant long-term impact on educational outcomes.

BelongED Lost Learning Calculator™ is provided for illustrative and educational purposes to support leadership conversations. Figures should be interpreted alongside professional judgement and local context.