Enter two decimal numbers and choose an operation — addition, subtraction, multiplication, division, or exponent — to get your result. The Decimal Calculator handles positive and negative decimals, integers, and scientific notation (e.g. 3.5e8). You can also set a rounding precision from no rounding up to 6 decimal places, so your answer comes back in exactly the format you need.
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Rounded Result
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Line up the decimal points of both numbers so they are vertically aligned. Add zeros to make both numbers the same length after the decimal point if needed, then add them column by column from right to left, carrying over just like with whole numbers. The decimal point in your answer goes directly below the decimal points in the numbers you added.
Align the decimal points vertically and pad shorter numbers with trailing zeros so both have the same number of decimal places. Subtract column by column from right to left, borrowing when necessary. Place the decimal point in the result directly below the aligned decimal points.
Ignore the decimal points and multiply the numbers as if they were integers. Count the total number of decimal digits across both numbers, then place the decimal point that many places from the right in your product. For example, 1.2 × 0.3 = 0.36 because there are two decimal digits total.
Convert the divisor to a whole number by multiplying both the dividend and divisor by the same power of 10 (e.g. multiply both by 10 if the divisor has one decimal place). Then perform standard long division and place the decimal point in the quotient directly above its position in the dividend.
A decimal exponent like 4^0.5 is equivalent to a root — specifically the square root of 4, which is 2. In general, a^(p/q) equals the q-th root of a raised to the power p. For non-fractional decimal exponents, you can use logarithms: a^b = e^(b × ln(a)).
The square root of a decimal can be found by rewriting the decimal as a fraction, taking the square root of the numerator and denominator separately, then simplifying. For example, √0.25 = √(25/100) = 5/10 = 0.5. For non-perfect decimals, use a calculator or successive approximation.
Scientific notation expresses very large or very small numbers as a decimal times a power of 10, such as 3.5 × 10^8. In this calculator you can enter such values using 'e' notation — for example, type 3.5e8 for 3.5 × 10^8 or 4.7e-9 for 4.7 × 10^−9. The calculator will process them correctly.
After the result is computed, you can choose to round it to a specific number of decimal places — from 0 (ones) up to 6 decimal places. Standard half-up rounding is applied, meaning 0.5 and above rounds up while below 0.5 rounds down. Selecting 'Do Not Round' displays the full precision result.