About OurCalculators.com
Our mission
Most calculator sites do finance and math, then stop. But the numbers that decide real outcomes show up everywhere: what a UK redundancy payout comes to, whether a rental property actually cash-flows, how much a US immigration filing costs, what a bathroom renovation should run you. We built OurCalculators.com because those calculations deserve the same standard finance calculators get: show the formula, show the variables, show a worked example, not just a number to screenshot and hope it's right.
Built for four countries, not one
We cover the US, UK, Australia and Canada, and we treat that as four separate jobs, not one generic template stretched across borders. A wage calculator built for the US federal tax system doesn't quietly reuse UK PAYE assumptions. A property calculator for Australian stamp duty doesn't borrow US closing-cost conventions. Where the rule, rate or terminology is country-specific, the calculator is built around that country's actual system, not adapted from whichever one we built first.
Formula transparency
Every calculator on this site includes:
- The exact formula or statutory provision it uses
- Plain-English definitions for every variable you enter
- A worked numerical example
- A link to the authoritative source behind the numbers (IRS, HMRC, IRCC, the relevant Act, etc.)
If a calculator can't show its working, it doesn't go on this site.
Runs in your browser, not on our servers
Every calculation runs entirely client-side in vanilla JavaScript. There's no server round-trip, no account, no data collection tied to what you type in. Your inputs never leave your device, and the result appears the moment you finish typing, not after a spinner.
What we cover today
119+ calculators across 12 categories: legal (UK, US, Canada and Australia), finance, property, wage, health, math, business, travel, astrology, garden, renovation and pets. New calculators go live most weeks, usually because a reader asked for one we didn't have yet.
Who keeps this accurate
The OurCalculators.com Editorial Team maintains every tool on this site. Before a calculator ships, its formula is checked against the primary source, such as IRS or HMRC guidance for tax tools, the relevant statute for a legal calculator, or official wage and rate data where a figure is government-set. When a threshold moves, such as a US tax bracket, a UK statutory redundancy cap, a Canadian CPP rate or an Australian minimum wage adjustment, we review every calculator that depends on it and update the ones affected.
If you ever spot a figure or formula that looks off, tell us. We investigate every report and correct verified errors, usually within a day.
The rest of the family
OurCalculators.com is one of five sites built on the same principle: free tools, formulas shown, built around the real-world system each one serves. SA Property Tools covers South African property investment. PayTools handles South African payroll and salary calculations. Faraid Hub does Shariah-compliant Islamic estate planning. AI Build shares practical guides for building with AI.
Disclaimer
Every calculator on OurCalculators.com is for informational and planning purposes only. Results are estimates, not legal, financial, tax or professional advice. Laws and rates change, always verify with an authoritative source or a qualified professional before you act on a number from this site.
Explore our tools: Legal calculators · Finance calculators · Health calculators · Math calculators