Getting Started

Introduction

Hissab is a natural-language calculator for exact expression work. Type one calculation per line and Hissab evaluates numbers, units, dates, colors, bases, statistics, probability, finance, IP addresses, symbolic algebra, complex numbers, and chained references in place.

1 + 1
15 kilometers to miles
5! + 3^2
derivative(2x^2, x)
(2 + 3i) * (1 - i)

Lines can build on earlier lines when they are evaluated together. Use labels for results you want to reuse, or prev for the immediately previous line.

monthly_savings = 4500 - 1200 - 600
yearly_savings = monthly_savings monthly to yearly

What Hissab is good at

• Plain math — arithmetic, percentages, powers, roots, factorials, modulo, absolute value, symbolic algebra, and complex numbers.
• Unit-aware work — conversions, mixed-unit arithmetic, rates, compound units, prefixes, and dimensional checks.
• Data and science — statistics, probability, trigonometry, dates, times, number systems, bitwise operators, IP address math, and color operations.
• Finance and business — interest, growth, loans, mortgages, annuities, returns, margins, break-even, and runway.
• Workflows — labels, prev, line<N>, and total<N> for multi-line calculations.
• AI-assisted calculation — bring your own model provider key, ask in natural language, and let the assistant produce Hissab expressions before answering.

Expression first

Hissab is intentionally strict. Filler words, misspelled units, and unknown keywords make an expression invalid instead of being silently ignored.

Write the expression itself:

25% of 200
13 kilograms + 12 pounds to kg
256 ^ (1/8)