About SortedSums

Last updated 2026-10-08

SortedSums is a free collection of 186 calculators for everyday life, the job site, the office and the lab. Each tool does one job on one page: type your numbers and the answer updates instantly. There is no sign-up, no paywall and no download, and every calculation runs in your browser.

What you’ll find here

• Unit Converters (18): Length, weight, volume, temperature and more.
• Area, Perimeter & Volume Calculators (20): Shapes, surfaces and solids.
• Construction Materials Calculators (29): Concrete, asphalt, gravel, paint, tiles…
• Price Estimators (16): Your rates, instant cost breakdowns.
• Accounting & Business Calculators (30): Margins, markup, GST/VAT, depreciation, break-even.
• Engineering Calculators (26): Beams, fluids, electrical, HVAC and more.
• Everyday Calculators (20): Percentages, tips, dates and health.
• Finance Calculators (11): Loans, interest and savings.
• Science Calculators (16): Physics, chemistry and electricity basics.

How the calculators are made

• Cited sources. Every formula and reference value links to a free public source, drawn from81 publishers such as NIST, U.S. and other government agencies, OpenStax and LibreTexts open textbooks, and university pages. The sources are listed at the bottom of each calculator.
• Tested against worked examples. Each calculator has automated tests that check its results against worked examples from those sources or against hand calculations. Every page is also loaded in a real browser and checked for errors and accessibility before each release.
• Assumptions in the open. Material densities, bag yields, waste factors and similar assumptions are stated next to the input and can be edited to match your material or supplier.
• Explained, not just answered. Each page shows the formula, a worked example and answers to common questions, so you can check the result yourself.
• Your units, your rates. Inputs and results switch between metric and imperial units. Price estimators remember the rates you type on your own device, never on our servers.

Use results with care

Results are for informational and educational purposes only and are provided “as is”, without warranty. They are estimates, not professional engineering, financial, tax or medical advice. Read thedisclaimer before relying on a result for anything that matters.

Corrections and suggestions

Found a mistake, a broken source link or a calculator that’s missing? Emailhello@sortedsums.com or see the contact page. Corrections are checked against the cited source and fixed as a priority.

SortedSums is operated by SortedSums.