Formula
Effective weight = priority × remaining topics. A subject with priority 2 and 3 topics has weight 6. Its share is weight divided by the total weight, multiplied by the available minutes.
Study & productivity
Study Time Calculator
Divide a fixed study-time budget across subjects using priority and the number of topics still remaining.
Make the budget useful
Allocate your study minutes
Add subjects, give each one a positive priority and topic count, and get whole-minute shares that add exactly to your budget.
Set your budget
Divide available study time
Subjects
Each weight is priority × remaining topics.
Proportional allocation
90 minutes allocated across 2 subjects.
Subject A60 min · 66.7%
Subject B30 min · 33.3%
Formula
Priority and topic load work together
Effective weight = priority × remaining topics. Each subject receives its effective-weight share of the budget. Decimal shares are converted to whole minutes with a largest-remainder method, so the displayed minutes always add back to your entered budget.
The quick guide
Use workload and urgency together
The calculator is a planning aid, not a prediction of how quickly you will learn a subject.
Worked example
With 90 minutes, Subject A weight 2 and Subject B weight 1 receive 60 and 30 minutes. The result uses a deterministic largest-remainder rounding method so no minutes disappear.
Small budgets and safe limits
Zero minutes can be honest
If the budget is smaller than the number of subjects, some allocations may be 0 minutes. That reflects the entered budget rather than pretending every subject received meaningful time; increase the budget or narrow the list. Inputs are bounded for safe, predictable browser calculations: the budget is at most 1,000,000 minutes, priority at most 1,000, remaining topics at most 10,000, and the list at most 100 subjects.
FAQ
Why can two subjects with the same priority get different time?
Remaining topics are part of the effective weight, so the subject with more remaining topics receives a larger share.
Do allocated minutes always add to my budget?
Yes. Whole-minute shares use stable largest-remainder rounding, and the displayed allocations add exactly to the entered budget.
Should priority be a grade or a percentage?
No universal scale is required. Use a simple positive relative weight, such as 1 for normal, 2 for important, and 3 for urgent.