Free Hair Colour Calculators and Stylist Tools

Tools are free, login-free calculators and reference utilities you can use mid-appointment. They exist because the maths behind professional colour — developer ratios, grams per service, lifting capacity, processing times — is unforgiving and easy to fumble when a client is sitting in your chair.

Every tool runs instantly in the browser, shows its assumptions and the formula it used, and ends with a summary you can screenshot into your own notes. Nothing here is gated: no account, no trial timer, no upsell interruption.

Use the calculators to check your mix before you commit to it, and use the reference tools when a client asks a question you would rather answer with a number than a shrug. Each tool page also explains the underlying rule in plain language, so the next time you do the calculation in your head you will already know the answer. Where a tool mirrors something the app does automatically, we say so and link to it.