Zoma Calculator and OSA Converter
Hundreds of calculators and converters in one place — for math, chemistry, physics, finance, health and more.
Categories
BMI Calculator
Body Mass Index from weight and height, with category.
Loan / EMI Calculator
Monthly installment (EMI) for a loan with fixed interest.
Compound Interest
A = P(1 + r/n)^(nt) — compound interest.
Standard Calculator
Button-based calculator with numeric keypad, +, −, ×, ÷, %, parentheses and live preview.
Molar Mass / Molecular Weight
Parse a chemical formula (e.g. H2O, C6H12O6, CuSO4·5H2O) and compute the molar mass.
pH Calculator
Calculate pH from [H⁺] or vice versa.
Percentage Calculator
Find X% of Y, what % X is of Y, percentage increase/decrease.
Length Converter
Convert between metric and imperial length units.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine.
Age Calculator
Exact age in years, months, days from birth date.
VAT Calculator
Add or remove VAT from an amount.
Tip Calculator
Calculate tip and split the bill among people.
Comprehensive Tools
A single platform combining 150+ calculators and converters across 19 categories. From basic and scientific calculators to chemistry, physics, molecular biology, agriculture tools, and more. Each tool is designed for ease of use with formula display and step-by-step solutions.
Educational & Free
Every calculator shows the formula used, calculation steps, and explanations. The Knowledge Center features educational articles in chemistry, physics, math, biology, and agriculture. The platform is completely free with no registration required.
Bilingual & Offline
The platform fully supports Arabic and English with automatic RTL/LTR direction switching. Works as a Progressive Web App (PWA) that can be installed and used offline. All data is stored locally on your device.
About Zoma Calculator and OSA Converter
Zoma Calculator and OSA Converter is a comprehensive online platform combining hundreds of calculators and converters in one place. Designed for students, researchers, engineers, farmers, and anyone needing fast, accurate scientific and everyday calculations. The platform includes basic and scientific calculators, comprehensive unit converters, chemistry tools like molar mass and pH calculators, physics tools, financial calculators like loan EMI and compound interest, molecular biology tools like DNA concentration and PCR copy number, and agricultural calculators for seeds, fertilizers, and pesticides per feddan.
The platform features full Arabic and English support with automatic right-to-left direction adaptation. It works as a Progressive Web App (PWA) that can be installed on phones or computers and used offline. All calculations run locally on the user's device, ensuring complete privacy with no data sent to servers.
The platform's Knowledge Center includes comprehensive educational articles explaining how to use various calculators, explaining scientific formulas and laws, and providing practical examples in chemistry, physics, mathematics, biology, agriculture, and finance. The platform was developed by Mohamed Osama Sayed, a Biotechnology graduate from Assiut University.