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wattmaths

Contact

The best way to reach me is email: hello@wattmaths.com. I read every message.

Sithum Imarsha
Full-stack and AI engineer

What you can email me about

  • Report a wrong number

    A rate, rebate or result that doesn't match your bill or the official source. I'll check it against the source.

    Report it

  • Suggest a calculator

    A question about your home's energy that our calculators can't answer yet.

    Suggest it

  • Something is broken

    A page that doesn't load, a button that doesn't work, or a result that looks wrong on your device.

    Tell me

WattMaths at a glance

  • 31 calculators
  • 50 topics · 290 sources
  • Reviewed 23 September 2026
  • Checked at least every 90 days
See every source

Before you email

Check the calculator's method section first. It shows where each number comes from and when it was last reviewed.

See every source and where we use itSee how we calculate

What I can't help with

  • Personal financial advice. The calculators give estimates. Your own bill and quotes come first.
  • Quotes or installer referrals.
  • Paid placements or leads. WattMaths doesn't sell either.

Start with a calculator

Your email stays private

I use your address only to reply to you. There is no mailing list.

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