How to round numbers in R

Rounding Functions and Examples

round(3.14159, 2)   # 3.14 - round to 2 digits
ceiling(3.14)       # 4    - always round up
floor(3.99)         # 3    - always round down
trunc(3.99)         # 3    - drop fractional part

Apply to a data frame column:

df <- data.frame(price = c(10.456, 20.999, 15.5))
df$price <- round(df$price, 2)
#     price
# 1 10.46
# 2 21.00
# 3 15.50

Note: R uses “round half to even”, so 2.5 rounds to 2.

See Also

• round() — Round to specified digits
• floor() / ceiling() — Round down or up