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Plan your study time

Allocate study hours across subjects before exams — with difficulty-weighted suggestions and a feasibility check that tells you if your plan fits.

Logic updated April 2026

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This calculator allocates a study budget across subjects in the run-up to exams, weighting each subject by difficulty (easy 0.7×, medium 1.0×, hard 1.5×) and the remaining hours required. It returns a per-subject suggested daily study allocation and flags whether the total plan is achievable in the days available. An optional opportunity-cost overlay values the study hours against an alternative hourly wage.

How this is calculated

Formula

weight_i = remainingHours_i × difficultyMultiplier ; totalWeight = Σ weight_i ; suggestedDailyHours_i = (weight_i / totalWeight) × availableHoursPerDay

Step-by-step

For each subject, compute remaining hours: max(0, target hours − hours already studied)
Apply the difficulty multiplier: easy 0.7, medium 1.0, hard 1.5 — harder subjects get a bigger share of time
Calculate the weight for each subject: remaining hours × difficulty multiplier
Sum weights across all subjects
Allocate the daily hours pool proportionally: suggested daily hours per subject = (subject weight ÷ total weight) × available hours per day
Plan is achievable when total hours needed ≤ available hours per day × days until exams
Optional: compute opportunity cost as remaining hours × hourly wage

Rounding mode: ROUND_HALF_UP
Precision: 20-digit internal precision (Decimal.js), rounded to 2 decimal places for display
Logic last reviewed: 2026-04-30

Assumptions & limitations

What this calculator assumes

remainingHours = max(0, targetStudyHours − hoursAlreadyStudied)
Difficulty multipliers: easy 0.7, medium 1.0, hard 1.5
Per-subject suggested daily hours are proportional to (remainingHours × difficultyMultiplier)
Plan is achievable when totalHoursNeeded ≤ availableHoursPerDay × daysUntilExams
Opportunity cost = remainingHours × hourlyWageAlternative; hidden when wage is zero
Exam date is informational only; the engine does not reason about calendar dates

What this calculator doesn’t account for

Doesn't model breaks or recovery time within a study day
Doesn't account for subject-specific learning curves (some subjects benefit from spaced repetition)
Doesn't factor in already-completed practice exams or revision quality
Doesn't model variable available hours across days (uses a flat daily figure)
Difficulty weights are heuristic — your subjective difficulty may differ

Worked example

A student has 14 days until exams, 6 hours/day available, with three subjects: Math (40 hours target, 12 done, hard), Biology (30 hours target, 18 done, medium), History (20 hours target, 5 done, easy).

Input	Value
Days until exams / available hours per day	14 / 6
Math (hours: target / done / difficulty)	40 / 12 / hard
Biology	30 / 18 / medium
History	20 / 5 / easy

Total hours needed: 55 — Total hours available: 84 — Plan is achievable. Math: 4.4 hrs/day, Biology: 1.0 hr/day, History: 0.6 hr/day.

Remaining hours: Math 28, Biology 12, History 15. Weighted: Math 28×1.5=42, Biology 12×1.0=12, History 15×0.7=10.5. Total weight: 64.5. Math share: 42/64.5 = 65% → 0.65 × 6 = 3.9 hours/day (the calculator's exact allocation may round). Biology: 19% → 1.1 hrs/day. History: 16% → 1.0 hrs/day. The plan achievable check confirms total hours fit in the available days, leaving buffer for review and unforeseen interruptions.

Frequently asked questions

How many hours should I study per week?

A common target is 2–3 hours of study per credit hour per week, in addition to class time. A full-time student carrying 15 credit hours might study 30–45 hours/week. Closer to exams, study density increases — many students do 6–10 hours/day in the final two weeks. The calculator helps you size daily targets so the workload is bounded rather than open-ended.

How do I balance study with work?

Be honest with yourself about what's possible. If you're working 20 hours/week and need 30 hours/week of study, you have 50 hours of weekly commitment plus class — close to the upper limit of sustainable. Pair this calculator with the part-time savings calculator to see whether reducing work hours during exam periods is financially feasible. Quality of study matters more than quantity — 4 focused hours often beat 8 distracted hours.

What is effective study time vs seat time?

Seat time is hours spent at a desk; effective study time is hours of focused, productive learning. Most learners' effective time is 50–70% of seat time due to distractions, fatigue, and ineffective methods. The calculator uses target hours as if they were effective hours — if you know your effective ratio, multiply your seat-time target accordingly. Two hours of focused practice on hard problems often beats four hours of passive review.

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