Our Calculation Methodology

Zakat Rate

Nisably uses the standard 2.5% (1/40) rate applied to net Zakatable wealth (assets minus eligible liabilities). This is the most widely agreed-upon rate across Islamic scholarship.

Nisab Basis

You can choose either gold (85g) or silver (595g) as your Nisab basis. Nisably shows the current equivalent in your chosen currency for both.

Scholars differ on which Nisab to use. Silver typically results in a lower threshold (Zakat due on less wealth). We present both clearly and let you choose explicitly.

Hawl (Lunar Year)

Nisably uses a 354-day approximation for the Hijri (lunar) year. Zakat is due once your wealth has been above Nisab for one complete Hawl. If wealth dips below Nisab, Nisably records the event and flags your Hawl for review.

Liabilities

You may deduct debts and liabilities from your Zakatable wealth. Nisably uses the following defaults, which you can override:

• Short-term debts: deducted in full
• Long-term debts: only current-year installments deducted by default

Scholarly views differ on long-term debt deduction. The assumption used in each calculation is always shown in your record.

Gold Jewelry

Whether gold jewelry is Zakatable is a matter of scholarly difference of opinion. Nisably never silently includes or excludes it — you choose, and the choice is always shown in your saved record.

Multi-Currency

Assets in different currencies are converted to your base currency using rates imported from Frankfurter (based on European Central Bank data), updated every 6–12 hours. You can override the rate used for any asset — the rate, its source, and whether you overrode it are all saved with each record.

Calculation Snapshots

Every saved calculation permanently records: the methodology version used, all asset and liability values, currency rates, Nisab values, and every assumption you made. Old records always remain explainable — even if our methodology changes in future.