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.

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

Fixed-rate monthly loan payment from amount, APR, and term, instantly.

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.

Calculate BMI and the CDC age- and sex-specific BMI percentile for children and teens aged 2–19. Includes a live growth-chart overlay, the four CDC weight-status bands, and a pediatric screening disclaimer.

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

Trig, logs, exponents, parentheses, memory, and history, with a real expression parser.

Add, subtract, multiply, or divide fractions and mixed numbers, with step-by-step working.

Calculate percent of a number, percent change, increase, and decrease.

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.

Find all possible words in your daily Strands grid, or get clues, theme names, and answers for today's NYT Strands puzzle.

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.

Get daily hints, category reveals, and answers for NYT Connections, or use the interactive board to solve your puzzle.

Rearrange letters to find all valid anagram words from a full dictionary.

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.

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

Convert hex color codes to RGB, HSL, and all CSS color formats instantly.

Convert Unix epoch timestamps to human-readable dates and back. Live clock, seconds and milliseconds, UTC and local time.

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.

Calculate selling price and profit from markup or margin percentage, with instant conversion between the two.

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.

Calculate the minimum hourly rate you need to charge to cover your target income, business expenses, taxes, and non-billable time.

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 using both parents' blood groups and Mendelian genetics.

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. Supports atm, kPa, mmHg, bar, psi, litres, mL, m³, Kelvin, Celsius, and Fahrenheit.

Solve C₁V₁ = C₂V₂ for any of the four variables, with molar or mass concentration units, multiple volume units, and a serial-dilution schedule.

Solve stoichiometry problems from any balanced equation: convert mass, moles, particles, solution volume, or gas volume between reactants and products with a step-by-step working log.

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

Balance any chemical equation instantly using the algebraic null-space method, with an atom count verification table.

Enter any two of voltage, current, resistance, or power; the other two are solved instantly using V=IR and P=VI.

Calculate density, mass, or volume from any two known values, with full unit conversion and a clickable reference table of 20 materials.

Solve for speed, distance, or time given any two values, with full unit conversion and simultaneous multi-unit output.

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

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, and CM for men, women, and kids. Enter any size to see every equivalent instantly.

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

Calculate simplified aspect ratios and scale image or video dimensions proportionally while keeping the ratio locked.

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.

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.

See the current moon phase, illumination percentage, and days to the next new or full moon for any date.

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 based on your flight.

Test your typing speed and accuracy in WPM, see a visual error heatmap, and export your typing certificate.

Calculate how much any appliance costs to run per hour, day, month, and year. Includes 28 appliance presets, a W/kW toggle, an energy-level gauge, and saving tips.

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.

Check WCAG 2.1 AA and AAA contrast ratios between any two colours. Live preview, pass/fail matrix, and preset pairs for accessible design.

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 REM to pixels instantly. Customizable base font size, bidirectional real-time conversion, and a CSS reference cheat sheet.

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.

Generate up to 500 UUID v4 or ULID identifiers in bulk, copy them individually or all at once, and decode the embedded timestamp from any ULID or UUID v1.

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, time between two clocks, 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.