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Mathematics Percentage, fraction, equation, power, matrix and calculus tools. 15 tools Finance Compound interest, loans, mortgages, savings, investing, ROI and inflation. 13 tools Salary Hourly rate, overtime, annual salary, raises and freelance pricing. 4 tools Tax VAT, GST, sales tax, IGV and ICMS for over 50 countries, plus withholding and… 54 tools Date and time Age, days between dates, working days, hours worked and time zones. 7 tools Health BMI, ideal weight, calories, basal metabolism, body fat and pregnancy. 9 tools Education Grade averages, weighted averages, final exam grade needed and GPA. 3 tools Statistics Sample size, correlations, t and chi-square tests, reliability and effect size. 4 tools Converters Length, weight, temperature, volume, area, speed and data storage. 14 tools Engineering Ohm’s law, electrical power, consumption, voltage drop and cable sizing. 3 tools Construction Concrete, paint, bricks, tiles and room areas. 3 tools Cars Fuel consumption, trip cost, average speed and depreciation. 3 tools Business Break-even point, margins, commissions, meeting cost and the 80/20 rule. 3 tools Marketing CTR, CPC, CPM, ROAS, conversion rate, CAC and LTV. 4 tools Text Word and character counts, case conversion, reading time and list cleanup. 4 tools Developers Number bases, Base64, colours, timestamps, passwords, UUIDs and subnets. 4 tools SEO Title and meta description length, slug generator and keyword density. 3 tools Productivity Savings goals, Pomodoro sessions, splitting bills and output per hour. 3 tools Artificial intelligence Token costs, API spend and time saved through automation. 2 tools