Free · Everyday planning calculators

School Supply Category Budget

Add category purchases and compare them with custom budget amounts.

  • Formula & worked example
  • Private in your browser
  • No signup
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

Four category purchases of $10, $20, $30 and $40 total $100; five $100 category budgets total $500.

Category spend = sum of category items; total budget = sum of category budgets

Worked example

Enter these known values and leave the other values blank.

Planned spending
Enter custom values
Clothing, accessories
100 USD
Electronics
100 USD
Shoes
100 USD
Supplies
100 USD
Miscellaneous
100 USD
Shirts
10 USD
Jeans
20 USD
Underwear
30 USD
Other
40 USD
Total budget
500 USD

Assumptions and limitations

  • Enter your own current prices and budgets. Category examples and the captured $700 overall benchmark are historical illustrative values, not current US household spending estimates. The pie charts show the entered category totals.

Common questions

What assumptions affect this result?

Enter your own current prices and budgets. Category examples and the captured $700 overall benchmark are historical illustrative values, not current US household spending estimates. The pie charts show the entered category totals.

Can I solve for a missing value?

Clear the missing field and enter compatible known values in the displayed units. Supported inverse branches remain available; rounding and one-way outputs keep their original direction.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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