Boring home calculators

Sourced Calc is a tiny static site. Seven tools, official figures where we cite them, and fat disclaimers. Not a contractor. Not a quote. No testimonials, no lead forms, no ads.

• Washington heat pump rebate (2026)

  Conservative estimate from public PSE, Seattle, Commerce, and IRS pages. Programs stack, conflict, and expire.

• Interior paint coverage

  Room walls from length, width, and height. Subtract typical doors and windows. Gallons to buy.

• Concrete bag estimator

  Rectangular slab. Length × width × thickness, then 40 / 60 / 80 lb premix bags using published Quikrete and Sakrete yields.

• How big a normal mortgage can be (2026)

  Official county cap. Under it, a normal mortgage. Over it, a harder loan, usually a worse rate.

• How much you can put in a 401(k) or IRA this year (2026)

  Official yearly cap. Under it, you are within the cap. Over it, the IRS does not let you put more in that account this year.

• How much the IRS says one mile is worth (2026)

  Official cents per mile from the trip date and trip type. Charity stays 14¢ all year. Estimate, not tax advice.

• How much you can put in an HSA this year (2026)

  Official yearly cap. Just you or you and family, plus the extra $1,000 if you are 55 or older. Not tax advice.