Boring home calculators

Sourced Calc is a tiny static site. Ten 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.

• How much the IRS lets most people subtract before tax (2026)

  Official 2026 amount. Most people use this instead of listing every deduction. Extra if you are 65 or older or blind. Not tax advice.

• What tax rate the IRS uses at each income level (2026)

  Official 2026 rates for just you or you and a spouse together. Not tax advice.

• How much you can put in a health FSA this year (2026)

  Official 2026 cap for what you set aside from pay. Leftover max if your plan lets unused money carry to next year. Not tax advice.