About OmanCalc
A small, independent set of calculators built for life in Oman and the wider Gulf: finance, family, faith, and everyday administration that generic calculators may not cover correctly.
Why this exists
Most online calculators are built for the United States or Europe. They may assume a work week, weekend, tax system, or fee structure that does not apply in Oman. The arithmetic can be correct while the result is unsuitable for a local decision.
OmanCalc is the version where the rules are right the first time. Oman labour law for gratuity, Oman VAT for invoices, entered lender quotes for mortgages, and prayer times by city. The point is not to be the prettiest calculator on the internet - it is to be useful for an Oman-context decision.
How we calculate
Every statutory formula on OmanCalc maps to a public source such as a royal decree, ministry notice, published tariff, or established astronomical algorithm. Quote-based planners identify their inputs rather than inventing market limits. When a rule changes, we change the calculator.
- VAT - Oman Tax Authority guidance and Royal Decree 121/2020.
- Gratuity, salary, working days - Oman Labour Law under Royal Decree 53/2023 and Ministry of Labour guidance.
- Visa and identity - published guidance on the Oman government portal; fees are presented as estimates where they vary.
- Mortgage - the user's lender quote and the standard amortisation formula.
- Electricity and water - published tariffs from Nama Group and the relevant regulators.
- Prayer and Hijri dates - established astronomical methods selected by the user; official local timings remain authoritative.
- School fees, tenancy - quote-based planners that total the amounts in a school offer or tenancy contract without inventing local fee bands.
Update policy
We review every calculator on a rolling schedule and immediately when a law, tariff, or fee schedule changes. Each page shows a Last reviewed date and the source link. If you find a stale figure, please tell us - see the contact section below.
Privacy
Calculations run on your device and no sign-up is required. Pages may load advertising and audience-measurement resources from Google and Cloudflare according to consent and browser settings, but calculator values are not sent to those services. The privacy policy explains local storage and external services in detail.
Disclaimer
OmanCalc is a reference tool, not advice. Tax, legal, financial, and religious decisions depend on facts specific to you that a calculator cannot see. For anything material - a tax filing, a contract, a settlement, an inheritance - confirm with a licensed Oman professional. We accept no liability for decisions made on the basis of these calculators.
Contact
Spotted a bug, an outdated number, or a calculator we should add? Email [email protected]. We read every message and update fast - typically inside a week for substantive corrections.
Sister site
For global, country-agnostic calculators (percentage, BMI, loan, currency, etc.), see JustCalc.