Calculadora de Algarismos Significativos Gratis
Conte e arredonde os algarismos significativos de um numero. Ferramenta essencial para calculos cientificos precisos.
Rounded
123,500.0000000000
Formula
Significant Figures
Rules for Counting Significant Figures
1. All nonzero digits are significant (123 has 3 sig figs) 2. Zeros between nonzero digits are significant (102 has 3) 3. Leading zeros are NOT significant (0.0045 has 2) 4. Trailing zeros after a decimal point ARE significant (2.50 has 3) 5. Trailing zeros without a decimal point are ambiguous (1500 could be 2, 3, or 4)
Rounding to n Significant Figures
1. Find the first significant digit 2. Count n digits from there 3. Round at that position
Exemplo Resolvido
Round 123456.789 to 4 significant figures.
- 01The first significant digit is 1
- 02Count 4 digits: 1, 2, 3, 4
- 03The next digit (5) rounds up
- 04Result: 123500
Perguntas Frequentes
Why are significant figures important?
Significant figures indicate the precision of a measurement. Reporting more digits than your instrument can measure implies false precision.
How do you handle sig figs in calculations?
For multiplication/division, the result should have as many sig figs as the least precise input. For addition/subtraction, round to the least precise decimal place.
Are trailing zeros significant?
Trailing zeros after a decimal point are significant (3.50 has 3 sig figs). Trailing zeros without a decimal point are ambiguous; use scientific notation to clarify.
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