Scientific Notation Calculator
Keep decimal input exact while converting between ordinary, scientific and engineering notation. Perform arithmetic on large or small numbers without first rounding them to a binary floating-point approximation. The exact fraction is retained when division repeats.
Your result
How the calculation works
Scientific notation uses a coefficient with 1≤|coefficient|<10 and an integer exponent. Engineering notation uses an exponent divisible by three. Decimal coefficients are converted to integer numerator/denominator pairs.
Worked example
1.23e4 × 2e2 = 2.46 × 10^6 = 2,460,000. Engineering notation is also 2.46 × 10^6. Dividing 1 by 3 gives the exact fraction 1/3 and a truncated decimal preview.
Assumptions and limitations
Inputs are at most 100 characters, exponents range from −300 to 300, and exact results are capped at 1,000 numerator/denominator digits. Repeating decimals show an ellipsis after at most 340 places.
Scientific notation alone does not set significant-figure rounding. Use the precision calculator when your task concerns measured values and rounding conventions.
Sources and editorial responsibility
Maintained by Renvoro Pty Ltd. Sources inform the methods and assumptions shown here; outputs have the limitations described on this page.
Method reviewed 2026-10-13. Calculation standards · Report an issue