Complicated Problems.
Simple Calculators.
Free tools for legal, finance, tax, immigration, settlements, inheritance, and more, with every formula explained.
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Every calculator includes the formula, real-world use cases, and expert FAQs
🆕 Featured: New Sleep Calculators
Just added to Health: plan your bedtime, sleep cycles, and catch up on sleep debt
Sleep Calculator
Best bedtime or wake-up time using 90-minute sleep cycles.
🆕 NewUse Calculator →Sleep Cycle Calculator
Pick a target number of 90-minute cycles and get the matching time.
🆕 NewUse Calculator →How Much Sleep Do I Need?
Recommended sleep hours by age, from newborn to older adult.
🆕 NewUse Calculator →Sleep Debt Calculator
See your cumulative sleep debt over 7 nights, plus a recovery plan.
🆕 NewUse Calculator →Popular Legal Calculators
High-intent tools the big calculator sites don't build; every one explains the underlying law
BOI Compliance Checker
Updated for 2026: find out in 3 questions if you still need to file a BOI report.
✓ Updated 2026Use Calculator →Personal Injury Settlement Calculator
Multiplier method estimate with comparative negligence adjustment.
🇺🇸 USAUse Calculator →UK Redundancy Pay Calculator
Statutory redundancy under Employment Rights Act 1996, age-banded formula.
🇬🇧 United KingdomUse Calculator →Inheritance Tax Calculator
UK IHT (40% above £325k), US estate tax ($15M exemption), SA estate duty.
🌍 UK · USA · SAUse Calculator →Finance Calculators
Amortization formulas, compound growth, and FIRE planning, all explained
Mortgage Calculator
Monthly payment including P&I, tax, insurance, with amortization formula explained.
Use Calculator →FIRE Calculator
Your Financial Independence number across 6 countries, 4% safe withdrawal rate.
🌍 6 CountriesUse Calculator →Compound Interest Calculator
Daily, monthly, or annual compounding with optional contributions.
Use Calculator →Loan Calculator
Monthly payment, total interest, and full amortization for any loan term.
Use Calculator →Why OurCalculators.com Is Different
🏛️ Legal Tools Nobody Else Builds
Calculators.net and Calculator.net have almost zero dedicated legal tools. We cover BOI compliance (updated for the March 2025 rule change), personal injury, UK redundancy, family law, immigration, estate planning, and more, with the underlying statute cited.
📐 Formula Transparent
Every calculator shows the exact formula used. You should understand your result, not just trust it. We show variable definitions, worked examples, and links to authoritative sources (FinCEN, HMRC, IRCC, ATO).
⚡ Zero Server Delay
All calculations run in your browser. Results update instantly as you type, no server round-trip. Your data never leaves your device.
🌍 Built for Four Countries
Our legal, finance, property, and wage tools are built around the US, UK, Australia, and Canada individually, not one template stretched across borders. Each uses that country's own current rates, thresholds, and rules.
Free Online Calculators for the US, UK, Australia, and Canada
OurCalculators.com was built to fill a genuine gap: most calculator websites focus entirely on finance and math, leaving millions of people searching for legal, property, and wage calculation tools with no good answer, and almost none build separately for the US, UK, Australia, and Canada instead of guessing at one generic version. Whether you need to check if your company still has BOI filing obligations after the FinCEN rule change, calculate a personal injury settlement using the multiplier method, work out UK statutory redundancy pay under the Employment Rights Act, or find your Canada Express Entry CRS score, this site has a dedicated, accurate, and clearly explained tool for you, across 116+ calculators in 12 categories.
US Legal Calculators
Our US legal tools cover the highest-value niches: BOI reporting compliance under the Corporate Transparency Act (FinCEN), personal injury settlement estimation using the multiplier and per diem methods, child support guidelines, contingency fee calculations, and court deadline planning. Every tool explains the underlying federal or state rule.
UK Legal Calculators
For UK users, we offer statutory redundancy pay calculation under the Employment Rights Act 1996 (age-banded formula, £643/week cap), with a clear explanation of the taper relief and tax-free threshold rules. Inheritance tax calculation under HMRC guidelines includes the nil-rate band, residence nil-rate band, and spouse exemption.
Property, Renovation, and Wage Calculators
Property and renovation tools cover mortgage and closing-cost math for US buyers, stamp duty for Australian buyers, and renovation cost estimates that hold up against real contractor quotes rather than a generic per-square-foot guess. Our wage calculators handle minimum wage and take-home pay for the US and UK separately, since the two systems don't share a rate table or a tax code.
Finance and Planning Calculators
Our finance calculators cover the full spectrum: mortgage amortization with the standard P&I formula, compound interest with configurable compounding frequency, loan payment schedules, and the FIRE calculator, which supports six countries with local inflation and withdrawal rate assumptions.
Beyond legal, property, wage, and finance, the site also covers health, math, business, travel, astrology, garden, and pets, each with the same formula-shown standard as everything else here.