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Finance
Financial calculators for loans, investments, taxes, and budget planning
Health
Health and wellness calculators for BMI, calories, and fitness tracking
Math
Mathematical calculators for algebra, geometry, calculus, and statistics
Conversion
Length, weight, temperature, currency, and unit conversion tools
Everyday Life
Practical calculators for everyday tasks and decisions
Sports
Sports and fitness calculators for training, nutrition, and performance
Career
Salary comparisons, compensation breakdowns, and job market tools
Education
Educational calculators for GPA, grades, and academic planning
Biology
DNA analysis, genetics, lab dilutions, and life science tools
Chemistry
Molarity, stoichiometry, pH, molecular weight, and reaction tools
Construction
Construction calculators for materials, measurements, and planning
Ecology
Carbon footprint, biodiversity indices, and environmental impact tools
Food & Nutrition
Calorie counting, recipe scaling, macros, and meal planning tools
Music
BPM, key transposition, interval training, and audio production tools
Physics
Velocity, force, energy, circuits, optics, and mechanics solvers
Science
Scientific calculators for physics, chemistry, and biology
Statistics
Statistics calculators for data analysis and probability
Date & Time
Days between dates, time zones, age calculation, and countdown tools
Frequently asked questions
Common questions about how Ekuation works, what it costs, and what to expect.
A free online calculator catalog. Over 90 calculators across 19 categories — finance, science, health, math, conversions, everyday tasks. Every calculator shows the formula and a worked example. No account, no paywall, no ads.
Different priorities. Omnicalculator covers breadth (5,000+ tools). Ekuation focuses on showing the formula behind each calculator and explaining the math. Ekuation also runs no ads, requires no signup, and supports German.
Yes. No account, no payment, no ads, no premium tier, no upsell. Every calculator works without restriction. Use any of them as much as you want.
No. Click any calculator, enter your inputs, get the result. No signup, login, or email field. Bookmark a calculator and come back whenever — the URL works without authentication.
19 categories: math, finance, science, health, food, music, sports, time, and everyday-life tasks. Each category groups calculators with their formulas and step-by-step worked examples. Browse them on the homepage.
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