Math calculators
Percentages, fractions, ratios, averages, GPA tools, and more—organized in one place.
Simple Calculator
Type an expression below or use the keypad. Press Enter or = to evaluate. Need more functions? Open the full scientific calculator.
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Fast, accurate online calculators
RapidRatio is a free hub for math and finance calculators built around high-precision, decimal-first workflows so outputs stay trustworthy on any device. Use the calculator on the left, or browse by category below—each section lists dedicated tools and guides.
Finance calculators
Mortgage payment tools—breakdown table or charts & amortization view—with more finance tools over time.
Physics calculators
Force (F = ma), elastic energy, E = mc², and psychrometric tools for labs and HVAC.
Fitness & Health calculators
Body Mass Index (BMI), daily calorie targets, Navy & Army body fat estimation, and exercise tools.
Grade Calculators
GPA, target grades, and what-if final exam score calculators to help you plan your academic success.
Other Calculators
Age, date, and time zone tools—date and time utilities in one hub.
Online Tools
Handy utilities like an Alarm Clock and Bar Graph Maker.
Resources
Articles and guides on precision, formatting, and how our calculators work.