769 free calculators & tools · No sign-up · Private by design
Answer everyday questions with real numbers.
Instant, accurate calculators and tools for money, taxes, health, home projects, business, travel, school, code and fun — each with a plain-English summary, charts and expert FAQs.
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State tax, legal and insurance data reviewed October 2026Browse by topic
A–Z index →Mortgage payments, refinancing, affordability and home-equity math.
25 tools →Auto & VehicleCar loans, leases, fuel costs, EV savings and vehicle specs.
25 tools →Personal Loans & DebtDebt payoff plans, credit cards, personal and student loans.
21 tools →Investing & RetirementCompound growth, retirement, FIRE, dividends, bonds and trading math.
37 tools →Tax (Country Specific)US, UK, Canada and Australia income, payroll, sales and capital gains tax.
33 tools →InsuranceLife, health, home, disability and umbrella coverage needs.
15 tools →Salary, Career & HRHourly/salary conversion, overtime, raises, freelance rates and HR costs.
21 tools →Real Estate InvestingRental ROI, cap rate, cash flow, BRRRR, flips and landlord math.
20 tools →Business & StartupMargins, break-even, SaaS metrics, valuation, cap tables and inventory.
25 tools →E-commerce & SellingMarketplace fees, product pricing, shipping and ad profitability.
20 tools →CryptoCrypto profit, DCA, staking, mining, DeFi and leverage math.
15 tools →Health & FitnessBMI, body fat, calories, macros, running pace, heart rate and strength.
35 tools →Medical, Pregnancy & PetsDue dates, ovulation, baby growth, lab conversions and pet age and dosing.
25 tools →Cooking & KitchenRecipe scaling, cup-to-gram conversions, baking math, roasting times and coffee ratios.
25 tools →Home, DIY & ConstructionPaint, flooring, concrete, lumber, roofing, decks, pools and gardens.
35 tools →Energy & UtilitiesElectricity bills, solar, HVAC sizing, appliances and electrical math.
21 tools →TravelFlight times, time zones, Schengen days, currency, tipping and trip budgets.
20 tools →Dates, Time & CountdownAge, date differences, business days, time cards, time zones and timestamps.
20 tools →Math, Science & EngineeringPercentages, fractions, statistics, algebra, geometry, electronics, chemistry and physics.
64 tools →Education & StudentsGPA, final grades, college costs, study plans, citations and attendance.
20 tools →SEO, Marketing & ContentSEO previews, schema, UTM links, readability and ad-budget math.
20 tools →Social Media & CreatorEngagement rates, creator earnings, sponsorship pricing and growth projections.
21 tools →Developer ToolsJSON, regex, Base64, hashes, JWTs, colors, CSS generators, subnets and DNS.
41 tools →Legal & GovernmentSettlements, divorce, probate, copyright, patents and residency math.
25 tools →Weddings, Events & LifeWedding budgets, guest lists, catering, drinks and event planning.
15 tools →GamingPSU wattage, bottlenecks, FPS, sensitivity, drop rates, gacha odds and DPS.
20 tools →Sports & FantasyGolf handicap, Elo, batting average, passer rating, brackets and fantasy tools.
20 tools →Fashion & SizingClothing, shoe, ring and bra sizes, sewing and knitting math, jewelry value.
20 tools →Photography & VideoDepth of field, exposure, golden hour, astrophotography, bitrate and pricing.
21 tools →Environment & SustainabilityCarbon footprint, flight and car emissions, diet impact, water use and recycling.
13 tools →Fun, Viral & QuizzesRandom pickers, name generators, quizzes, compatibility and “how do you compare” tools.
31 tools →Why people trust Mathva
Accurate formulas
Standard finance, health, science and engineering formulas with current official data, tested against reference values.
Private by design
Calculations run in your browser. We never see your income, health details or anything else you type.
Plain-English answers
Every result includes a clear summary, charts and FAQs, so you understand the “why”, not just the number.
Instant and mobile-first
No sign-ups, no pop-ups. Pages load fast on any phone and results update as you type.
Frequently asked questions
Are Mathva calculators really free?
Yes. All 769 calculators and tools are free with no account, trial or paywall. The site is supported by unobtrusive advertising and optional partner offers.
Is my information safe?
Almost every calculation runs locally in your browser — we never see or store the numbers you enter. A few live lookups (like domain, DNS or website speed checks) send only the domain or URL you type to the public service named on the page. Only forms you choose to submit are saved.
How accurate are the calculators?
We use standard, published formulas and official data (IRS, HMRC, ATO, CRA, CDC, WHO, USDA and others), and test each calculator against reference values. Results are estimates for planning — confirm major decisions with a professional.
How often are tax figures updated?
Tax brackets, allowances and limits are reviewed at the start of every tax year and whenever governments announce changes. Each tool page shows when it was last updated.
Can I share or save my results?
Yes. Every calculator has a Share link button that saves your inputs in the URL, plus Copy results and Print / PDF options.
Can I request a new calculator?
Absolutely. Use the contact page to suggest a tool, and we prioritise the most-requested ones.
New tools every week
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