Percentage calculator — change, ratio, tip & tax
Compute percent increase/decrease, find what fraction one number is of another, add tip or tax to a subtotal, or reverse a tax-inclusive total — all with live results and copy actions, local only.
Frequently asked questions
No. All percentage math runs in this tab only. Nothing is sent to LocalTools servers for processing.
Division by the starting value is required. When the start is 0 and the end is non-zero, the relative change is not a finite percentage — use absolute change instead or pick a non-zero baseline.