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. Everything runs locally in your browser — nothing is uploaded.
Convert percentage scores to letter grades. Enter your percentage to see the corresponding letter grade on standard scale. Everything runs locally in your browser — nothing is uploaded.
Calculate your final grade using weighted assignment scores. Enter grades and their weights to compute your overall percentage. Everything runs locally in your browser — nothing is uploaded.
Convert correct/total answers to percentage and letter grade.
Calculate total price including sales tax. Enter the pre-tax amount and tax rate to see the exact tax amount and final total. Everything runs locally in your browser — nothing is uploaded.
Estimate your income tax with progressive tax brackets. Enter income and deductions to calculate estimated tax liability and effective rate. Everything runs locally in your browser — nothing is uploaded.
Three modes: X% of Y (20% of ₹1,500 = ₹300), percent change (₹120 → ₹150 = +25%), and what-percent-of-what (45 is 25% of 180). Covers tips, discounts, tax, and grade math.
A 20%-off price of ₹800 means original = 800 ÷ 0.80 = ₹1,000 — not 800 × 1.20 (₹960). Always divide by (1 − rate) to undo a percentage decrease.
10% off then 10% off again is 19% total, not 20%: ₹100 → ₹90 → ₹81. Each discount applies to the reduced base — the calculator chains them correctly.
Full decimal precision (e.g., 33.333…% for 1/3), rounded for display only. Useful for tax and statistical comparisons where rounding early compounds errors.
No. All computation runs locally in your browser. Nothing is transmitted or stored.
Percentage Difference Calculator
Calculate the percentage difference between any two numbers. Useful for comparing data sets, prices, and measurements. Everything runs locally in your browser — nothing is uploaded.
Ratio Calculator
Simplify ratios to their lowest terms. Enter two numbers to find the simplest whole-number ratio between them. Everything runs locally in your browser — nothing is uploaded.
Rounding Calculator
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.