SUMX Calculator

SUMX Calculator is a clean, modern calculator designed for fast everyday calculations. Whether you're adding up expenses, working out percentages, calculating VAT or reviewing previous calculations, SUMX keeps everything simple, fast and easy to use. Built with a focus on clarity and performance, SUMX removes unnecessary clutter while giving you practical tools when you need them. A responsive interface, calculation history, custom themes and optional SUMX Pro features make it a calculator you'll use every day. Free features • Standard calculator • Calculation history • Percentage calculator • VAT calculator • Discount calculator • Light, Dark and System themes • Haptic feedback controls • Key sound controls Unlock SUMX Pro Upgrade once with a single lifetime purchase to unlock even more powerful features: • Scientific calculator • Margin & Markup calculator • Unit Converter • Currency Converter • Favourite calculations • Expanded calculation history • Additional personalisation options • Future SUMX Pro features Designed for everyday use SUMX is built for the calculations people make most often, including: • Everyday maths • Percentage calculations • VAT calculations • Discount calculations • Markup and margin calculations • Unit conversions • Currency conversions Whether you're shopping, studying, running a business or simply working out everyday numbers, SUMX helps you calculate quickly and accurately. Why choose SUMX? • Clean, distraction-free design • Fast and responsive calculator • Useful built-in calculation tools • Easy-to-read calculation history • Modern themes and accent colours • One-time Pro upgrade — no subscription • No account required SUMX Calculator is developed by X Made, an independent UK software studio creating practical, beautifully simple apps for everyday use.