Calculations,
refined.

Estimate monthly mortgage payments, total interest, and amortization.

Calculate your Equated Monthly Instalment instantly. See your monthly EMI, total interest, principal-vs-interest pie chart, and a full yearly amortisation schedule.

Monthly payment, total interest, and full amortization, with an extra-payment simulator.

Real car payment with sales tax, trade-in credit, fees, and full amortization.

Calculate your 2026 OBBBA car loan interest deduction — up to $10,000/year, available to itemizers and non-itemizers alike, with the real MAGI phase-out and new/US-assembly/first-lien eligibility checks.

Simple vs compound interest, side-by-side, with year-by-year growth.

Calculate Body Mass Index and category for adults.

Estimate daily calorie needs (TDEE) for maintenance, loss, or gain.

Body-fat % from a tape measure (Navy method), with lean mass and ACE category.

Calculate Basal Metabolic Rate: calories your body burns at rest, with all three reference formulas.

Ideal body weight by height: Devine, Hamwi, Robinson, Miller, and the BMI healthy range.

Solve for pace, time, or distance with min/km + min/mile and per-mark splits.

Weeks pregnant, trimester, due date, and a complete milestone timeline, from LMP or conception date.

Estimate the most likely conception date, with a 3-day window, from your last period or due date.

Estimated due date (EDD) from LMP, ultrasound, or conception, with a full 40-week milestone timeline.

Healthy weight-gain range by week and pre-pregnancy BMI.

BMI and BMI-for-age percentile for ages 2 to 19 from the CDC's published LMS table, the CDC 2022 extended method above the 95th percentile, band edges for the child's age and a growth chart.

Predict your next ovulation date, your 6-day most fertile window, and the due date if you conceive, with a visual calendar.

Trig, logs, roots, powers, factorials and E notation with brackets, memory, an Ans key and a 10-entry history, in degrees or radians, using a hand-written expression parser.

Add, subtract, multiply or divide fractions and mixed numbers, with step-by-step working on the least common denominator and exact repeating decimals.

Calculate percent of a number, percent change, increase and decrease, compare percent change with percent difference, and work back to the original price.

Crypto-secure random integers or decimals, with no-duplicate and sort options.

Solve any triangle by SSS, SAS, ASA, AAS, or SSA: sides, angles, area, perimeter, altitudes, and a live SVG drawing.

Mean, variance, and standard deviation (sample & population), plus median, mode, quartiles, and step-by-step working.

Enter your Wordle guesses and click each letter to set its colour; the solver instantly shows every possible answer.

Type your 6×8 Strands letter board to find every word that can be traced, with spangram candidates marked.

Find the highest scoring words from your letters for Scrabble, Words with Friends, and anagram games.

Solve NYT Letter Boxed in two words or fewer. Get daily hints, valid words, and generate optimal multi-word chains.

Type your 16 Connections words, find shared compound partners and anagrams, group tiles by color, and practice with example boards.

Find every word in your letters, with blank tiles, Scrabble points and multi-word phrase anagrams.

IPv4 network, broadcast, host range, wildcard and binary breakdown, for any CIDR or mask.

Crypto-secure passwords with custom length, classes, and a live entropy meter.

Encode any text or bytes to Base64 and decode back.

Estimate the cost of a prompt or API workload across GPT, Claude, and Gemini models — enter your text or token count and compare pricing instantly.

Estimate the GPU-hours and dollar cost to train an AI model from parameter count, training tokens, and GPU type.

Generate box-shadow and glassmorphism CSS visually. Interactive sliders, live preview on light/dark/checkered backgrounds, and one-click copy.

Materials shopping list and cost range for a rectangular residential deck — boards, joists, beams, footings, concrete bags, and fasteners.

Board count, linear footage, and cost for any deck or lumber project — enter dimensions or total area with board size and spacing gap.

Cubic yards, cubic metres, and bag count for slabs, columns, and footings, with a built-in waste factor.

Roofing squares, shingle bundles, underlayment, ridge cap, and drip edge from your roof dimensions and pitch.

Tile count, box quantity, and cost for any floor or wall area, with grout gap and waste.

Plank or tile count and total cost for any room, with waste factor and optional price per square unit.

Compare the simplified ($5/sq ft) and actual-expense home office deduction methods side by side, including the inventory-storage and daycare-provider exceptions.

Selling price from cost and a markup or margin, conversion both ways without a cost, the maximum cost for a shelf price, and markups along a supply chain.

Calculate the unit volume and sales revenue needed to cover all costs and start making a profit.

Calculate your Return on Ad Spend (ROAS), true ROI, net profit, and break-even ROAS for any paid advertising campaign.

Estimate your YouTube channel earnings based on daily video views, expected CPM rates, and niche RPM.

Calculate your social media engagement rate for Instagram, TikTok, or YouTube, and compare it against industry benchmarks.

Convert oven and stovetop cooking times to slow cooker Low and High times, switch between settings, and reduce liquid for crockpot recipes.

Calculate how long to thaw and cook a turkey by weight, stuffing, thaw method, and cooking method, with USDA safe temperatures and rest time.

Scale any recipe up or down for any number of servings instantly.

Convert oven recipe temperatures and times into their air fryer equivalents, tuned by food type, in °F or °C.

Scale pizza dough recipes by dough ball count, ball weight, and baker's percentages for hydration, salt, yeast, and oil.

Calculate baker's percentages from ingredient weights, or enter percentages to get exact grams. Includes a live hydration meter.

Convert your dog or cat's age to human years using veterinary guidelines based on species, size, and non-linear aging rates.

Predict a child's possible blood types and Rh factor from both parents' blood groups, with optional population weighting for hidden genes and a donor and recipient check.

Generate a 2x2 Punnett Square for a monohybrid cross with genotype and phenotype probabilities.

Calculate a pregnant dog's estimated whelping (due) date and track her week-by-week gestation with developmental milestones and owner care tips.

Calculate your cat's estimated due date and week-by-week gestation timeline with kitten milestones and owner care tips.

Calculate pH, pOH, [H⁺], and [OH⁻] from any one input. Includes a live colour-coded pH scale from 0 (strongly acidic) to 14 (strongly alkaline).

Solve PV = nRT for pressure, volume, moles or temperature in atm, kPa, mmHg, bar or psi, with R in every unit and molar volume at STP.

Solve C₁V₁ = C₂V₂ for any of the four variables in molar or mass units, with the solvent volume, the dilution factor and a serial-dilution pipetting plan.

Convert an amount of one species into any other through the balanced equation, in grams, moles, particles, solution or gas volume, with steps, a whole-equation table and percent yield.

Calculate percent yield, actual yield, or theoretical yield for any chemical reaction, with efficiency rating and over-100% warnings.

Balances chemical equations by exact linear algebra, including ions, electrons, hydrates and brackets, with atom, charge and mass checks.

Enter any two of voltage, current, resistance or power and get the other two from V = IR and P = VI, with the nearest standard E12 and E24 resistors.

Calculate density, mass or volume from any two values, with one-click metal presets, a searchable density table with NIST sources, and water density at any temperature.

Solve for speed, distance or time from any two values, find average speed over several legs, and convert running pace to speed with 5K to marathon times.

Solve KE = ½mv² for any missing variable. Supports multiple units with automatic conversion and step-by-step working.

Enter launch speed, angle, and height to get time of flight, max height, range, and landing speed for any projectile.

Solve v = f × λ for wave speed, frequency, or wavelength with multi-unit support and step-by-step working.

Convert shoe sizes between US, UK, EU, cm and inches for men, women and kids. Adult UK and EU follow Nike's published charts, with the ISO 19407 formulas beside each result.

Convert ring sizes between US, UK, EU, and Japanese standards, or find your size from a finger measurement in mm or inches.

Reduce a width and height to its aspect ratio, scale with the ratio locked, get video-friendly even sizes and work out bars or cropping for a frame.

Calculate a confidence interval for a population mean (Z or t-distribution) or a proportion (Wald and Wilson) at any confidence level.

Perform a Student's t-test (independent, paired, or one-sample) with exact p-value, t-statistic, and degrees of freedom.

Run a chi-square goodness-of-fit or independence test on your own data — get the statistic, degrees of freedom, and p-value instantly.

Enter two names and discover your compatibility percentage using the classic letter-frequency algorithm. Fun, deterministic, and symmetric.

Calculate your Life Path Number from your date of birth. Discover your core personality archetype, natural strengths, and life purpose through numerology.

Phase name, illumination and exact new moon, quarter and full moon times for any date, in your time zone or UTC.

Find your zodiac sign, element, modality, ruling planet, and personality traits from your birth date.

Find your Big Three — Sun, Moon, and Rising signs — from your birth date, time, and timezone, with a birth-chart wheel.

Personalized jet lag recovery plan: day-by-day sleep, bright-light, melatonin and caffeine schedule for your flight, with route presets and a calendar (.ics) download.

Test your typing speed and accuracy in WPM with the scoring shown step by step, compare it with a 168,960-person study, and see which keys you miss.

What any appliance costs per hour, day, month and year: 28 presets with typical hours, a ranked cost table, a yearly-kWh check and sourced US, GB and EU rates.

Estimate your personal annual carbon dioxide emissions in metric tons based on home energy use, transportation habits, and diet.

Estimate your personal daily and annual water footprint — including the hidden water in your food, clothing, and electronics.

Compare the price per unit of two products side by side. Automatically converts units to find the best value and exact savings.

Calculate a fair, weighted rent split among roommates based on bedroom size and private amenities like bathrooms, balconies, and closets.

Compare personal Claude, ChatGPT, and Google AI (Gemini) subscription costs — pick a tier from each, monthly or annual, and see the combined cost.

WCAG 2.2 contrast ratios for text and UI components, unrounded pass/fail, 8-digit hex with opacity, and the nearest passing colour when a pair fails.

Convert plain text to binary (UTF-8 / ASCII 8-bit groups) and decode binary back to readable text, instantly in your browser.

Convert CSS pixels to REM and back at any base font size, turn a 62.5% root into its base, batch-convert a CSS block, and check Tailwind v4 sizes.

Generate high-quality QR codes for any URL or text, downloadable as PNG or SVG.

Generate customized Lorem Ipsum placeholder text — paragraphs, sentences, words, or lists — with optional HTML tag wrapping.

Exact age in years, months, days, plus next birthday and totals.

Days between dates, add/subtract a duration, or count business days.

Add or subtract durations, total a list of times, multiply or divide a duration, and convert any time unit.

Hours worked between two times, with breaks, cross-midnight shifts, and weekly overtime.

Compute weighted or unweighted GPA on a 4.0 or 5.0 scale.

Weighted average across assignments and exams, plus exactly what you need on the final.