Change log

New calculators, data updates and corrections, newest first.

October 23, 2026

Added a cubic yard calculator for any shape and a sand calculator with 50 lb bag counts.
The ZIP code and city search boxes now show matching places as you type, with a preview of each result, and say which place the results are for.
New garden tools: frost dates by ZIP code (NOAA 1991–2020, with a vegetable planting calendar) and planting zone by ZIP code (USDA 2023 map), plus frost dates and planting zones for every city and town, state by state.
New calculators: retaining wall blocks, sod, grass seed, concrete block, gutters, board feet, concrete steps and shower tile.
Added frost line depth by state from each state's building code, a deck framing planner with a plan drawing (2021 IRC span tables), and calculators for rafters and roof pitch, siding, wallpaper and baseboard and trim. The frost date tool now has a fall planting calendar too.
Easier to use: length boxes take feet and inches the way you'd write them (10' 6", 30 3/8), each box says what's wrong if a number looks off, there's a search button in the header, and results are easier to read on phones.
Every calculator can now be added to other websites for free: look for "Add this calculator to your website" at the bottom of each tool.

New page: energy code by state (US DOE data, September 2026), plus each state's code on its climate-zone page.
Common-size tables on every calculator.
New insulation calculator (batts and blown-in) and paver patio calculator.
The square footage calculator now takes feet and inches.
New insulation R-value chart.
The county climate zone data is now a free download.

Nine counties missing from the PNNL table (including Ada County, Idaho) added from the 2021 IECC itself, so all 3,143 counties are covered.
Climate zone lookup now searches by ZIP code, city or county.
Launched the climate zone and insulation lookup with a page for every state.
Launched Nail the Math with 15 calculators.