Calculation Guides

Learn the math behind everyday calculations. Each guide explains underlying equations, edge conditions, and practical examples.

How to calculate a percentage

Turn a part and a whole into a percentage, and convert a percentage back into a value.

Understand the reducing-balance instalment formula used by OmniCalc loan tools.

Inclusive versus exclusive prices, and why CGST/SGST/IGST splits are assumptions.

Convert an increment percentage into a new CTC or in-hand figure.

Clock-in, clock-out, breaks and overnight shifts.

Why compounding frequency changes the maturity amount.

Use a live catalogue and a published mid-market reference rate.

Current percentage and classes still needed to hit a target.

Turn distance, economy and price into a trip fuel budget.