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A fast popup calculator that understands plain math: percentages, units, currency, hex, fractions, variables and history. Sumpad is a fast calculator that lives in your toolbar. Type math the way you’d say it and get the answer as you type. EVERYDAY MATH • 15% of 240 · 80 + 20% · 20% off 80 · percent change from 50 to 65 • Parentheses, powers, roots, trig, logs, factorials, averages CONVERSIONS • Live currency rates for 31 currencies: 100 usd to eur, $45 to gbp • Length, weight, volume, temperature, time, data, speed, area, pressure, energy, power and angles: 5 miles to km, 72 f to c, 3 cups to ml • Hex, binary, octal, fractions and scientific notation: 255 to hex, 0.375 to fraction WORKS THE WAY YOU DO • Variables: rate = 0.065, then 1250 * (1 + rate) • “ans” reuses your last answer • History you can click to reuse • Right-click any number or expression on a web page to calculate it • Type “calc” in the address bar for instant answers • Keyboard shortcut: Alt+Shift+C • Settings for decimal places, separators and light or dark theme PRIVATE BY DESIGN Calculations happen on your device. No accounts, tracking or ads. The only network request downloads public exchange rates.