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Unit Converters

This page brings together every unit and measurement converter on Calculate.co.nz, so you can jump straight to the right tool instead of hunting through search results. Each converter below handles a specific type of measurement: length, area, volume, weight and mass, speed, temperature, energy, force, torque, density, flow rate, pressure, power and angle, plus computing conversions like data storage, file size, data transfer rate, DPI and PPI, and colour values in HEX, RGB and HSL. You will also find the aspect ratio calculator, CSS unit converter, IP subnet calculator, scientific to standard notation converter, and dedicated fuel consumption and fuel economy converters for comparing car running costs. Click through to the converter you need, type your figure into the box, and the result updates instantly in both metric and imperial units, whether that is centimetres to inches, kilograms to pounds, kilometres to miles, or litres per 100 kilometres to miles per gallon. Every converter here is free, works directly in your browser, needs no sign-up or download, and is accurate enough for cooking, DIY, study, engineering and everyday household use. If you need currency conversion, use the dedicated currency converter instead, and for recipe quantities the cooking measurement converter below covers cups, grams and millilitres. Bookmark this page as your one-stop reference whenever you need to switch between units quickly and reliably.

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Reviewed and maintained. Last reviewed 2026-07-02 and checked on a twice-monthly cycle against IRD, RBNZ and Stats NZ. How we keep data current.