A clean, fast four-function calculator for everyday arithmetic. Works instantly in any browser — no app, no download, no sign-up required. Supports positive and negative numbers and percentage calculations.
Click or tap the digit buttons to enter a number. Press an operator (÷, ×, −, +) to register the operation, then enter the second number and press = to see the result. Press AC at any time to clear everything and start over. The +/− button toggles the sign of the current number between positive and negative. The % button divides the current number by 100, converting it to a decimal percentage — useful for discount and tax calculations. You can also chain operations: 5 + 3 × 2 processes as (5+3) × 2 = 16 when entered sequentially.
Results from this calculator are estimates based on standard arithmetic operations and are provided for general informational purposes. Rounding, regional standards and manufacturer variations can cause small differences from official or brand-specific figures.
For decisions where precision is critical — engineering, construction or legal contexts — verify results with a qualified professional or an official reference source.
This calculator uses standard arithmetic operations. The underlying logic was built and manually cross-checked against independent reference calculators and textbook worked examples across dozens of test cases before publication.
Every formula on elCalculador is reviewed by our editorial team for mathematical accuracy, and pages are re-audited whenever a calculator's logic or inputs are updated.