A browser based Energy Cost/Consumption Calculator

My company supply technology into education and I'd like a tool to allow a school to compare the energy consumption of their existing technology, with a new more energy-efficient alternative.

This could be built simply in Power Apps but it needs to be browser based and nicely branded as Elementary Technology ( https://elementaryuk.com ) . It needs to be accessible by anyone as a microsite/landing page.

The technology power usage we're calculating is interactive whiteboards in classrooms. A typical older whiteboard may consume 300 Wh of electricity. Multiply this by 6 hours usage a day and 195 school days a year gives power consumption per year. We can calculate the cost at a typical cost of £0.25 per kWh. Then multiply this by the number of classrooms across a school.

The tool then compares this with a more energy efficient alternative - power savings and cost savings are presented.

The user keys in the model, power consumption and quantity of their existing technology. The app calculates their total power consumption and cost.

A spreadsheet which includes the necessary formulas is attached.

There are peripheral graphics and photos, links and calls to action - it is a promotional landing page.