Percentage Calculator

Percent Calculator is a compact calculation tool for percent changes, markups, sales tax, and checkout totals.

Enter an original amount, a percentage change, and an optional tax rate to instantly see the checkout total, adjusted amount, savings or markup amount, tax amount, and effective after-tax change in a tight 2x2 metric summary. Quick-start presets cover common reduction, clearance, markup, and tax-only checks.

Save complete scenarios with names and notes, then use Load to restore the full form snapshot and recalculate the result. The focused layout keeps inputs, summary totals, metrics, and saved scenarios easy to scan on phones and tablets.