Error Porcentual
Calcula el error porcentual entre valor experimental y teórico. Fórmula |E − T|/|T| × 100% con pasos claros.
Fórmula principal
% error = |E - T| / |T| × 100
How do you calculate percent error?
Use % error = |experimental − theoretical| / |theoretical| × 100. The absolute value makes the percent non-negative. A signed form (E − T) / T × 100 keeps the direction: positive means the measurement was high.
Sobre esta herramienta
El error porcentual es |experimental − teórico| / |teórico| × 100. Ideal para laboratorios y comprobación de mediciones.
Cómo usar esta calculadora
- Introduce valores personales realistas y confirma el sistema de unidades antes de calcular.
- Usa el resultado como estimación de planificación, no como diagnóstico ni garantía.
- Compara el número con tu objetivo, contexto y orientación profesional cuando aplique.
- Revisa los pasos para entender cómo se construyó la estimación a partir de tus datos.
Ejemplos resueltos
Example 1: 9.7 vs 9.8 m/s²
E = 9.7, T = 9.8. |E − T| = 0.1. % error = 0.1 / 9.8 × 100 ≈ 1.02%. Signed = (9.7 − 9.8) / 9.8 × 100 ≈ −1.02%.
Example 2: 99.2 °C vs 100 °C
E = 99.2, T = 100. % error = |99.2 − 100| / 100 × 100 = 0.80%.
Example 3: 0.89 vs 0.79 g/cm³
E = 0.89, T = 0.79. % error = 0.10 / 0.79 × 100 ≈ 12.7%. A large percent error usually means units, identity, or method — not just rounding.
Preguntas frecuentes
What is the percent error formula?
% error = |E − T| / |T| × 100, where E is experimental and T is theoretical (accepted). Relative error is the same ratio without multiplying by 100.
Can the theoretical value be zero?
No. The formula divides by T. If the accepted value is zero, percent error is undefined; report the absolute difference instead and follow your lab’s rule.
What is the difference between percent error and percent difference?
Percent error uses the accepted value in the denominator. Percent difference uses the average of two measurements when neither is the true value: |A − B| / ((A + B)/2) × 100.
Should percent error be negative?
Unsigned percent error is ≥ 0 because of the absolute value. Signed percent error can be negative when E is below T. Use whichever form the rubric asks for.
Do units cancel in percent error?
Yes, if E and T share the same unit. Convert first, then subtract. The percent itself is unitless.