Free tools for everyday calculations
Calculate a percentage, proportion or rule of three in seconds. The tools give a readable and reusable result.
2 outils
Finance & Budget
Rule of three (cross multiplication)
Good old cross multiplication, made fast. Enter 3 known values, the tool computes the 4th instantly. Handles units, decimal commas and large numbers. No sign-up.
Open the tool
Finance & Budget
Percentage calculator
Compute a discount, VAT, margin, share or evolution in real time. Fill in any two boxes, the third adjusts automatically. Bi-directional, with full formula and multiplier coefficient so you actually understand the math.
Open the tool