Round numbers using 5 modes: round half up, banker's rounding, floor, ceil, and truncate. Shows step-by-step explanation with the digit being rounded. Everything runs locally in your browser — nothing is uploaded.
Convert fractions to decimal numbers. Shows the step-by-step division process. Everything runs locally in your browser — nothing is uploaded.
Calculate the GCF/GCD of two or more numbers. Shows the prime factorization method step by step. Everything runs locally in your browser — nothing is uploaded.
Calculate the number of ways to arrange k items from n items (nPr). Shows the step-by-step permutation calculation. Everything runs locally in your browser — nothing is uploaded.
Step-by-step assistant for India Income Tax Return filing. ITR form selection, 80C/80D deductions, salary and house property income.
Get document checklists and step-by-step guidance for Indian voter registration forms — Form 6 (new enrollment), Form 7 (correction/objection), and Form 8 (name transfer within constituency).
Banker's rounding (round half to even) rounds 0.5 to the nearest even number. For example, 2.5 → 2 and 3.5 → 4. This avoids the statistical bias that standard rounding introduces when processing large datasets. Used in IEEE 754 and financial reporting.
Floor rounds toward −∞ (−3.7 → −4), ceil rounds toward +∞ (−3.7 → −3), and truncate simply drops decimals (−3.7 → −3). For positive numbers, floor = truncate. They differ for negative numbers.
It shows you exactly which digit is being rounded and why the result is what it is. For example, rounding 3.145 to 2 places: the third decimal digit is 5, so round-half-up rounds up to 3.15.
Round half up: everyday math. Banker's rounding: statistical/financial data. Floor: when you need the lower bound. Ceil: when you need the upper bound. Truncate: when you need to drop decimals without rounding (e.g., integer division).
Significant Figures Calculator
Round numbers to a specified number of significant figures. Essential for scientific and engineering calculations. Everything runs locally in your browser — nothing is uploaded.
Percentage Calculator
Computes percentage values, percentage increases and decreases, and what-percent-of-what relationships with precise decimal arithmetic. Essential for everyday math — tips, discounts, tax rates, grade scores, and statistical comparisons where quick percentage answers are needed.