Rounding Calculator & Sig Figs

Rounding Calculator rounds any number the moment you type it. Round to the nearest tenth, hundredth or whole number, round to significant figures, or round to a fraction, and see every step of the working.

Made for students, teachers, accountants, engineers and anyone who needs a rounded number they can trust.

LIVE ANSWER, NO BUTTON
Type a number or a calculation and the rounded answer updates instantly.

FIVE WAYS TO ROUND
• Decimal places: round to 0 to 15 decimal places
• Place value: nearest ten, hundred, thousand, million or billion, and nearest tenth, hundredth, thousandth down to billionths
• Significant figures: round to 1 to 15 sig figs
• Nearest multiple: round to the nearest 0.05, 0.25, 5, 10 or any value you choose
• Nearest fraction: round to the nearest 1/2, 1/4, 1/8, 1/16, 1/32 or 1/64, shown as a mixed number like 3 5/8 or as a decimal

TEN ROUNDING RULES
Round half up, half down, half even (banker's rounding), half odd, half towards +∞, half towards −∞, round up (ceiling), round down (floor), truncate and away from zero.
The rule picker shows your number's answer under every rule side by side and warns you when a number sits exactly halfway, so you always know why 2.5 becomes 2 or 3.

SHOW THE WORKING
• Step-by-step explanation in plain English
• Number line showing both possible answers, the halfway point and the distance to each
• Colored digits mark the rounding digit, the deciding digit and the dropped digits
• Rounding error shown as a value and as a percentage
• Copy the steps as text, share them as an image or save them to Photos

ACCURATE WITH ANY NUMBER
• Exact decimal math: 2.675 rounds correctly to 2.68
• Very large and very small numbers, from 1E-300 to 1E300
• Negative numbers handled correctly under every rule
• Works with calculations: + − × ÷, brackets, %, powers, square root and π

SIGNIFICANT FIGURES COUNTER
Count the sig figs in any number, see which digits are significant, get clear explanations for tricky cases like 1200, and round to n significant figures in one tap. Ideal for chemistry and physics homework.

BATCH ROUNDING
Round a whole list of numbers at once, compare the totals before and after rounding, and export the results to CSV.

MONEY ROUNDING
Cash rounding to the nearest 0.01, 0.05, 0.10 or up to 10, rounding up, down or to the nearest. Set price endings like .99, .95, .90, .49 or .00.

TIME ROUNDING
Round times and durations to the nearest 1, 5, 6, 10, 15 or 30 minutes or to the hour. Get the result in h:mm and in decimal hours, useful for timesheets and billing.

HANDY EXTRAS
• Output as plain, 1,234,567, scientific, engineering or E-notation
• Built-in number pad with a movable cursor
• Smart paste reads values like $1,234.50 or 1.234,50 €
• Save your favorite mode, rule and precision and apply it in one tap
• History saves every calculation: search, reopen, copy, share or remove with undo
• Decimal point or comma, choice of thousands separator, and Indian number grouping
• Light, dark or system theme

WHO IT'S FOR
• Students learning to round decimals, whole numbers and significant figures
• Teachers checking answers and showing the method
• Science students working with sig figs and scientific notation
• Accountants and shop owners rounding prices and cash
• Anyone rounding hours for timesheets

Download Rounding Calculator and round off numbers, decimals, sig figs, fractions, money and time with confidence.