CalculatorQueen Estimate Sums Calculator

The Estimate Sums Calculator accepts a list of values and a chosen rounding place, rounds the addends, and then adds those rounded values. It displays the estimate beside the exact sum and quantifies their difference. This supports magnitude checks for budgets and classroom arithmetic without presenting the estimate as a reconciled total.
What problem it solves
It helps users catch missing digits, duplicated lines, and order-of-magnitude mistakes before performing or approving an exact total.
Alternatives & competitors
Mental rounding, a spreadsheet with separate rounded and exact columns, or a written classroom estimation exercise.