Calculate the percentage difference between any two numbers. Useful for comparing data sets, prices, and measurements. Numbers never leave your device — every calculation runs locally in your browser.
Calculate the exact duration between two times. Handles overnight time spans and displays results in hours, minutes, and seconds. Numbers never leave your device — every calculation runs locally in your browser.
Calculate total work hours for a single shift between start and end times with one configurable break. Essential for timesheets and payroll. Numbers never leave your device — every calculation runs locally in your browser.
Calculate triangle area three ways — base and height, three sides (Heron), or two sides plus included angle. Pick the method matching your knowns. Numbers never leave your device — every calculation runs locally in your browser.
Calculate revenue growth rate by comparing current period revenue to previous period. Track your business growth over time. Numbers never leave your device — every calculation runs locally in your browser.
Calculate body fat percentage using the US Navy circumference method. Enter waist, neck, height, and hip measurements. Health data never leaves your device — every calculation runs locally in your browser.
Formula: |A - B| / ((A + B) / 2) × 100. It uses the average of both values as the denominator, making it symmetric — the result is the same regardless of which value is first.
Percentage difference compares two values symmetrically. Percentage change compares a new value to an original value: (New - Old) / Old × 100. Use percentage change for before/after comparisons.
Comparing two measurements, prices, or data points where neither is the 'original'. Example: comparing two product prices, test scores, or experimental results.
Both values are identical. The percentage difference is zero when there is no difference between the two numbers.
Yes. All calculations run in your browser. No data is transmitted.
|100 − 150| ÷ 125 × 100 = 40.00% (average 125, absolute Δ 50). It is symmetric — the swap button proves order never matters — unlike percent change. Bars scale to the larger value and the headline turns rose past 25%.
Percentage Calculator
Computes X% of Y and what-percent-of-what (X is what % of Y) in two side-by-side panels with precise decimal arithmetic. Essential for everyday math — tips, discounts, tax rates, grade scores, and statistical comparisons where quick percentage answers are needed.
Ratio Calculator
Simplify any two-number ratio to lowest terms via GCD — paint mixes, screen sizes, shares. Reduce 150:225 to 2:3 in one pass — free, runs locally.
Last updated October 2026