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Frequently used
Scientific Calculator
Free online scientific calculator with the classic two-line school-calculator layout: trig in degrees or radians, logs, powers, roots, factorials, memory keys and full keyboard support, plus an Advanced mode with fraction entry, S⇔D, nPr/nCr and hyperbolic functions.
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Date Calculator
Free date calculator. Find the exact number of days, weeks, months and business days between two dates, or add or subtract days, weeks, months and years from a date.
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Aspect Ratio Calculator
Free aspect ratio calculator. Simplify a resolution into its ratio, solve for a missing width or height at a target ratio, or work out the largest centered crop that fits a target ratio.
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Loan & Mortgage Calculator
Free loan and mortgage calculator with monthly payment (EMI), full amortization schedule, and an extra-payment payoff comparison showing how much time and interest you can save. Instant, private, no sign-up.
Open tool →Finance
VAT Calculator
Free online VAT calculator. Add or remove VAT at any rate, with standard-rate presets for the UK, Germany and 30+ countries, plus a full VAT-rate reference table. Instant, private, no sign-up.
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Card Foreign Transaction Fee Calculator
Free calculator for credit and debit card foreign transaction fees. See what your bank charges to spend abroad or in another currency, project the annual cost based on how often you travel, and see how much a 0%-fee card would save you.
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Compound Interest Calculator
Free compound interest calculator. See how a lump sum plus monthly contributions grow over time, adjusted for inflation, or work backward from a savings goal to the monthly contribution you need. Instant, private, no sign-up.
Open tool →Loan & Mortgage Calculator
Free loan and mortgage calculator with monthly payment (EMI), full amortization schedule, and an extra-payment payoff comparison showing how much time and interest you can save. Instant, private, no sign-up.
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IBAN Validator
Free IBAN validator. Check any European or international IBAN using the ISO 13616 MOD 97 checksum, detect the country, and see the correct printed format. Runs entirely in your browser.
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German Salary & Tax Calculator
Free German gross-to-net salary calculator for 2026. All 6 Steuerklassen, church tax, all 4 social insurance branches, TV-L public-sector pay lookup, and employer cost. Every rate cited to an official source.
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Freelancer Hourly & Day Rate Calculator
Free freelancer rate calculator. Work backward from the income you actually want to keep, factoring in expenses, time off, and the hours that are never billable, to a real day rate and hourly rate.
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Inflation Calculator
Free inflation calculator with current 2026 rates for Germany, France, the Eurozone, the UK, the US, Australia and New Zealand. See what an amount is really worth after inflation, in either direction.
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Crypto Profit & DCA Calculator
Free crypto profit and dollar-cost-average calculator. Log your actual buys, get your true weighted average cost basis, and see your real profit or loss against the current price.
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Debt Payoff Calculator (Snowball vs Avalanche)
Free debt payoff calculator comparing the snowball and avalanche methods side by side. See exactly which debt to attack first, your debt-free date, and how much interest each strategy actually saves.
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UK Take-Home Pay Calculator
Free UK take-home pay calculator for 2026/27. England, Wales and Northern Ireland or Scottish tax bands, National Insurance, all student loan plans, pension contributions, and employer cost, all in one place.
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Hours & Time Card Calculator
Free time card calculator. Add up clock-in and clock-out times across a week, subtract unpaid breaks, and see total hours worked as decimal and HH:MM, plus gross pay if you enter an hourly rate.
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Tip Calculator
Free tip calculator. Work out the tip and total on a bill at any percentage, and split it evenly between any number of people, down to the exact amount each person owes.
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Discount & Percent-Off Calculator
Free discount calculator. Find the sale price and amount saved from a percent-off discount (including two stacked discounts), or work backward from a sale price to find the original.
Open tool →Health
BMI Calculator
Free BMI calculator for adults, metric or imperial. Get your Body Mass Index, category, and the healthy weight range for your height, with the real limitations of BMI explained honestly.
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BMR Calculator
Free BMR calculator using the Mifflin-St Jeor equation, the formula the Academy of Nutrition and Dietetics currently recommends, with Harris-Benedict shown alongside for comparison.
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Calorie Calculator
Free calorie calculator. Your daily calorie target for maintaining, losing or gaining weight, based on Mifflin-St Jeor BMR, your real activity level, and a macro breakdown.
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Body Fat Calculator
Free body fat percentage calculator using the U.S. Navy circumference method. Estimate your body fat from a tape measure, with the category breakdown and real accuracy limits explained.
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Ideal Weight Calculator
Free ideal weight calculator showing four established formulas (Hamwi, Devine, Robinson, Miller) side by side, plus the healthy BMI-range weight for your height, instead of a single number.
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Pace Calculator
Free running pace calculator. Solve for pace, time or distance with race presets (5K to marathon), and predict your time at another distance using the Riegel formula.
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Due Date Calculator
Free pregnancy due date calculator from your last period (cycle-length adjusted), a known conception date, or an IVF transfer date. Naegele's rule, explained honestly.
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Pregnancy Calculator
Free pregnancy calculator. Your current week and trimester, due date, and key milestone dates (viability, full term) from your last period, cycle-length adjusted.
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Pregnancy Conception Calculator
Free conception date calculator. Estimate your likely conception window from your last period and cycle length, or work backward from a known due date.
Open tool →Hosting
Hosting Bandwidth Calculator
Free hosting bandwidth calculator. Estimate the monthly bandwidth your site really needs, factor in CDN caching, and see which hosting tier (shared, VPS, dedicated) fits your traffic.
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SERP Snippet Preview
Free Google search snippet preview. See exactly how your title and meta description will look in search results, with real pixel-width truncation, not just a character count.
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Reading Time & Word Count Calculator
Free reading time, word count and readability calculator for bloggers and writers. Adjustable reading speed, sentence and paragraph counts, and a Flesch reading-ease score.
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Robots.txt Generator
Free robots.txt generator. Build Allow/Disallow rules per user-agent, add your sitemap, and get a ready-to-upload robots.txt file, with a one-click WordPress default preset.
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.htaccess & Nginx Redirect Generator
Free 301/302 redirect generator for Apache (.htaccess) and Nginx. Build a list of URL redirects, plus one-click HTTPS and www/non-www rules, ready to paste in.
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Open Graph & Twitter Card Meta Tag Generator
Free Open Graph and Twitter Card meta tag generator. Fill in a few fields and get the exact <meta> tags to paste into your page head, previewed and ready to copy.
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Regex Tester & Explainer
Free regex tester with live match highlighting, capture groups, a replace preview, and a plain-English breakdown of what each part of your pattern actually does.
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Cron Expression Builder
Free cron expression builder and explainer. Build a schedule from dropdowns or paste an expression, get a plain-English description and the next 5 run times.
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Website Downtime Cost Calculator
Free website downtime cost calculator. See what one outage actually costs in lost revenue, or project your annual cost from your host's uptime guarantee, with the standard "nines" table included.
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IP Subnet Calculator
Free IPv4 subnet calculator. Network and broadcast address, usable host range, subnet and wildcard mask, binary breakdown, IP class, and private/public detection.
Open tool →Data
CSV to JSON Converter
Free CSV to JSON converter (and back). Choose your delimiter, keep or skip the header row, pretty-print or minify. Runs entirely in your browser — your data never uploads.
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Base64 & URL Encoder / Decoder
Free Base64 and URL encoder/decoder. Correctly handles Unicode and emoji, unlike many online converters. Runs entirely in your browser — nothing you paste is uploaded.
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Markdown to HTML Converter
Free Markdown to HTML converter, and back again. Headings, bold/italic, links, images, lists, blockquotes and code blocks, all converted in your browser.
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Text Case Converter
Free text case converter. Convert to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case and more, all at once.
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PNG & JPEG to WebP Converter
Free PNG and JPEG to WebP converter that runs entirely in your browser. Adjustable quality, before/after file sizes, batch conversion. Your images are never uploaded.
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CSV Cleaner (Dedupe & Column Splitter)
Free CSV cleaner. Trim whitespace, remove empty rows, remove duplicates (by the whole row or one column), and split a single column into several by a delimiter. Runs entirely in your browser.
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Random Number Generator
Free random number generator. Generate one or many random numbers in any range, with or without duplicates, integers or decimals, using your browser's cryptographic random source.
Open tool →Math
Percentage Calculator
Free percentage calculator covering every common question: X% of Y, what percent one number is of another, percentage change, and increasing or decreasing a number by a percentage. Formula shown for each.
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Unit Converter
Free unit converter for length, weight, temperature, volume, speed, area, time and digital storage. Type in either box, both update instantly, plus a quick-reference table for the units you picked.
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Fraction Calculator
Free fraction calculator for add, subtract, multiply and divide. Shows the full step-by-step working, the simplified fraction, the mixed number, and the decimal equivalent.
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Statistics Calculator
Free statistics calculator: mean, median, mode, range, and both population and sample variance/standard deviation, with a live bar chart of your data.
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Geometry Calculator
Free geometry calculator for area and perimeter: circle, square, rectangle, triangle, trapezoid, parallelogram, ellipse and regular polygon, with a live diagram and the formula shown.
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Triangle Solver
Free triangle solver for SSS, SAS, ASA and SSA. Finds every missing side, angle, and the area using the law of sines and cosines, with a live scaled diagram and the ambiguous SSA case handled properly.
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Linear Equation Solver
Free linear equation solver for ax + b = cx + d. Shows every algebra step, not just the final value of x, including the no-solution and infinite-solutions cases.
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GCF & LCM Calculator
Free GCF and LCM calculator for two or more numbers at once. Shows the prime factorization of each number and how the greatest common factor and least common multiple are built from them.
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Prime Number Checker
Free prime number checker. Instantly see if a number is prime, its full list of factors, its prime factorization, and the nearest primes on either side.
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Exponent & Root Calculator
Free exponent, root and scientific notation calculator. Raise any number to any power, find any root, and convert between standard and scientific notation, with the expanded working shown for whole-number powers.
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Ratio & Proportion Calculator
Free ratio calculator: simplify a ratio, solve a missing value in a proportion, or split a total amount by a given ratio, with the working shown for each.
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Roman Numeral Converter
Free Roman numeral converter, both directions. Converts numbers 1-3999 to Roman numerals and validates Roman numerals back to numbers, correctly rejecting invalid forms like IIII or VX.
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Number Base Converter
Free number base converter. Convert between binary, octal, decimal, hexadecimal, or any custom base from 2 to 36, all shown at once with strict per-base digit validation.
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Multiplication Table Generator
Free interactive multiplication table, color-coded by value, up to 20×20. Hover or tap any cell to highlight its row and column, adjustable table size.
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Age Calculator
Free age calculator. Enter a birth date to get your exact age in years, months and days, plus totals in weeks, days and hours, the weekday you were born, and a countdown to your next birthday.
Open tool →Scientific Calculator
Free online scientific calculator with the classic two-line school-calculator layout: trig in degrees or radians, logs, powers, roots, factorials, memory keys and full keyboard support, plus an Advanced mode with fraction entry, S⇔D, nPr/nCr and hyperbolic functions.
Open tool →Date Calculator
Free date calculator. Find the exact number of days, weeks, months and business days between two dates, or add or subtract days, weeks, months and years from a date.
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GPA Calculator
Free GPA calculator. Add your courses with credit hours and letter grades to get your term GPA on the standard 4.0 scale, or fold in a previous GPA to calculate your new cumulative GPA.
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Grade Calculator
Free grade calculator. Work out your current weighted grade from assignment scores, or solve backward to find exactly what you need on the final exam to hit a target course grade.
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Quadratic Equation Solver
Free quadratic equation solver. Solve ax squared + bx + c = 0 with full step-by-step working, real or complex roots, factored form, and the parabola's vertex and axis of symmetry.
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ECTS Converter
Free ECTS converter. Convert between US credit hours and European ECTS credits, work out ECTS directly from your weekly study hours, or find your ECTS grade letter from your actual class rank.
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German Grade Calculator
Free German grade calculator using the Modified Bavarian Formula, the same conversion method uni-assist and most German universities use to translate a foreign grade onto the 1.0-4.0 German scale.
Open tool →Camera Gear
Depth of Field Calculator
Free depth of field calculator. Enter your sensor format, focal length, aperture and subject distance to see the near limit, far limit, total depth of field and hyperfocal distance, with a live diagram.
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Crop Factor & Equivalent Focal Length Calculator
Free crop factor calculator. Convert a focal length and aperture between any two sensor formats, full frame, APS-C, Micro Four Thirds, medium format or a custom size, and see the equivalent angle of view.
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Hyperfocal Distance Calculator
Free hyperfocal distance calculator. Find the exact focus distance that keeps everything from half that distance to infinity acceptably sharp, with a quick-reference table across common apertures.
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Photo & Video Storage Calculator
Free photo and video storage calculator. Work out how many shots or how many minutes of footage fit on a memory card, and how many cards to bring on a trip.
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Print Size & DPI Calculator
Free print size calculator. Enter your image's pixel dimensions to see the maximum print size at any DPI, or enter the print size you want to see exactly how many pixels you need.
Open tool →Aspect Ratio Calculator
Free aspect ratio calculator. Simplify a resolution into its ratio, solve for a missing width or height at a target ratio, or work out the largest centered crop that fits a target ratio.
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Every tool above runs entirely in your browser. Nothing you type is uploaded, logged, or stored.