Rounding Calculator
Rounding calculator that rounds any number to the decimal places you choose, from whole numbers to 10 places. Instant, exact and free to use.
Formula
Round to the nearest unit at the chosen decimal place.
Use it from the API
curl "https://moltcalc.com/api/calc/rounding?value=3.14159&places=2"
See the API docs for every endpoint and the input schema.
FAQ
How do I round to 2 decimal places?+
Look at the third decimal digit: if it is 5 or more, round the second decimal up, otherwise leave it. So 3.14159 rounds to 3.14, and 2.675 rounds to 2.68.
What rounding rule does this calculator use?+
Standard round half up: a digit of exactly 5 rounds away from zero at the chosen place, so 2.5 becomes 3 when rounding to whole numbers. A tiny correction is applied to avoid floating point quirks like 1.005 rounding the wrong way.