Solar Mass to Kilogram Converter

How it is calculated

Two multiplications are applied to the number of solar masses M you enter: kg = M × 1.98892 × 10³⁰ and Earth masses = M × 332,946. The kilogram figure is printed in scientific notation with four decimals in the mantissa (for example 2.7845e+30), so it carries five significant digits and is not an exact integer. The Earth-mass figure is rounded to two decimals. The constants are fixed approximations of the Sun's mass and of the Sun-to-Earth mass ratio, so answers can differ slightly from values based on newer reference constants. Zero returns zero, while a negative number or non-numeric text gives no result, because a mass cannot be negative. Use a decimal point (1.4); a comma is not read as a decimal mark.

Common mistakes

• Reading 2.7845e+30 as 2.7845 × 30 or as 2.7845 to the power 30. The “e+30” means × 10³⁰, a 31-digit number.
• Entering a mass in kilograms or Earth masses into the solar-mass field. The input is solar masses only, so 1.4 means 1.4 times the Sun.
• Expecting more than about five significant digits. The output is shortened to a few digits and the constants are rounded, so do not use it where high-precision astronomy values are required.
• Typing a decimal comma (1,4). The tool shows no result for it; write 1.4.
• Reading very small inputs as Earth-sized by accident: 0.000003 solar masses is about 1.00 Earth masses, so a planet's mass needs many leading zeros in this field.