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Finance calculators

By Sitraka Forler · Lecturer, Durham Business SchoolUpdated 16 October 2026 About this site

Four calculators for the numbers quants and finance students compute most. Each page gives the formula, a worked example whose figures you can check by hand, the Python that reproduces it and the lesson where you code it yourself. They run in your browser: nothing you type leaves it.

1. Calculators

  1. 1.1Sharpe ratio calculatorSharpe and Sortino from pasted returns or from mean and volatility, with the annualisation you choose.
  2. 1.2Value at Risk (VaR) calculatorHistorical and parametric VaR, with expected shortfall, from pasted returns, any confidence level and horizon.
  3. 1.3Bond duration calculatorPrice, Macaulay and modified duration, convexity and DV01 of a fixed-coupon bond.
  4. 1.4NPV and IRR calculatorNet present value, internal rate of return and payback period from a list of cash flows.

2. Interactive explainers you can embed

Eight charts with sliders, one per concept, free to embed in course notes, a blog or a slide deck. Open a concept and use Embed this chart under its chart for the snippet, in a light or a dark version.

Looking for a formula rather than a calculator? Every formula on one page.