Get the answer and see how it was built.

Create a private invoice with multiple line items, explicit tax, discount, and shipping math, then print or save the browser preview as PDF.

Calculate CET1, Tier 1 and total capital ratios together from reported figures, with formulas and an optional user-set target gap. No compliance verdict.

Estimate an auto loan payment with explicit tax-basis, trade-equity, upfront-versus-financed fee, and amortization assumptions.

Estimate a fixed personal loan payment, net proceeds, interest, upfront-fee impact, total borrowing cost, APR, and monthly schedule.

Compare a gross-income housing benchmark with a take-home budget after debt, utilities, essentials, and savings.

Estimate a 2026 traditional IRA RMD from each December 31, 2025 balance and the IRS Table III factor, with a total across up to ten IRAs.

Project a 401(k) with 2026 IRS limits, two employer-match tiers, match left on the table, and a vesting-aware leaving-job estimate.

Estimate trip fuel, total cost, cost per mile or kilometer, and the average per traveler using US MPG or metric L/100 km inputs.

Estimate mulch volume for one rectangular or round bed in US or metric units, with an optional whole-bag count from your bag label.

Calculate topsoil for multiple lawn or garden zones, then split a soil mix and compare custom bag and bulk purchase costs.

Convert roof pitch between x:12 ratio, degrees, and percent slope, then calculate rise, pitch multiplier, and straight rafter line length.

Calculate whole drywall panels from room dimensions or known area, including ceiling, openings, panel size, and extra material.

Estimate cattle calving or service dates with a visible inclusive gestation assumption, elapsed-day receipt, planning buffer, and local schedule.

Estimate asphalt tons and volume for multiple paved areas and cutouts using editable density, allowance, and optional material price.

Estimate a PC PSU wattage class while keeping component load, headroom, manufacturer system floors, and source assumptions separate.

Estimate paver pieces, mixed pattern sets, border courses, whole packages, base, bedding, and optional package cost.

Calculate the volume of nine common solids with mixed length units, formulas, and cubic-unit, liter, and gallon conversions.

Find the GCF, GCD, or HCF of 2–20 integers and inspect every Euclidean remainder and multi-number merge step.

Find the exact LCM of 2–15 positive integers and list the first 1–100 shared positive multiples with visible fold steps.

Divide whole numbers with a place-aligned quotient, remainder, exact invariant, and divide–multiply–subtract–bring-down transcript.

Estimate wall paint for one rectangular room using explicit openings, coats, product-label coverage, and optional container size.

Generate a deterministic filled or outlined block circle with exact block counts, stacks of 64, and a row-by-row build guide.

Count posts, spans and nominal rail pieces for measured connected runs, with an explicit shared-corner and gate-post audit.

Turn length, width and depth, or a known area and depth, into cubic yards; add differently sized sections and see each row and the total.

Estimate gross activity calories from weight, time and a cited 2024 Adult Compendium MET value, with an above-rest figure and the formula.

Solve a general triangle from three known sides or angles, with both SSA solutions compared, area, perimeter and clear no-solution reasons.

Estimate a fixed-rate home equity loan's monthly payment and total interest with a cent-by-cent schedule, plus an optional check against your own CLTV limit.

Estimate US buyer closing costs with a rough 2%–5% range or your own Loan Estimate fees, and see cash to close with deposit, lender and seller credits on separate lines.

Enter or paste up to 12 categories and values, make a pie or doughnut chart with percentages that add to 100%, and download SVG or PNG.

Convert gross hourly pay to annual salary or annual salary to hourly pay using explicit paid hours and weeks, with weekly and monthly estimates.

Add sales tax at a rate you know, back tax out of an inclusive total, or total line items you mark as taxable, to the cent.

Add or remove UK VAT at 20%, 5% or 0% and see the net price, the VAT and the gross price, or total invoice lines per rate.

Add or remove Australia's 10% GST: the GST-exclusive price, the GST (1/11 of an inclusive price) and the GST-inclusive price.

Add or remove GST/HST, PST or QST for any province or territory: the price before tax, each tax and the total.

Estimate a child's rough adult height from both biological parents' heights with the AAP parent-height method, the equation and a ±4-inch range.

Estimate an exercise-specific one rep max from a 1–10 rep set, compare Epley and Brzycki, and see a clearly labeled percentage load table.

Calculate molarity, solute mass, or final solution volume with explicit units and formula steps.

Balance neutral molecular equations with exact whole-number coefficients, atom checks, and real conservation steps.

Add lumber rows, quantities, and prices per board foot, with a separate comparison of billing and measured dimensions.

Estimate rectangular, round, oval, or segmented pool water volume in gallons, liters, and cubic meters.

Convert numbers and Roman numerals both ways, check modern notation, convert dates, or process up to 100 mixed lines.

Calculate Wh from watts and time or volts and amp-hours, then estimate and compare battery runtime with visible assumptions.

Find a midpoint or missing endpoint with your own coordinates, worked formula steps and a matching graph.

Find exact slope, rise and run from two points, paste coordinate pairs, compare lines, and inspect an equal-scale graph.

Calculate cone volume from radius or diameter and perpendicular height, with exact pi, a decimal answer, cubic units, and substituted steps.

Calculate cylinder volume from radius or diameter and height, see base-area and substituted steps, then check an exact pi or decimal answer.

Calculate mean, sum, count and median, plan the average needed for a target, or combine group averages correctly using each group count.

Grade one test or paste up to 100 anonymous scores; see the exact percentage, the rounded one, and how your own cutoff treats each.

Calculate weighted and unweighted high school GPA, lock the baseline, and compare up to three grade changes without overwriting it.

Solve one-line percent equations, compare percent change with percentage points, or process up to 100 mixed questions.

Find a date before or after today, count calendar days or weekdays, and copy the date with its calculation details.

Compare up to 50 dates against one baseline or previous milestones, calculate working-day gaps, and batch add or subtract offsets.

See 52 full weeks plus the remaining day or days, decimal weeks, and the separate 52-or-53 ISO week-number answer for any year.

See the dates for all 12 zodiac signs and look up a birthday's sign, with the exact change time on cusp days in US time zones.

Get the 86,400-second answer, convert any number of days, or split seconds into full days, hours, minutes, and seconds.

Add rectangular room areas, paste feet and inches, and copy square-foot and square-meter totals.

Estimate concrete blocks with opening deductions, actual-versus-nominal CMU sizes, mortar joints, waste, and visible rounding.

Calculate concrete volume for up to 25 mixed rectangular, cylindrical, or annular sections with custom waste, bag yield, and ready-mix rounding.

Calculate a tip, split the bill to the cent, and copy a USD breakdown. Optional before-tax tipping.

Count US bills and coins by denomination with exact subtotals, total pieces, a nonzero breakdown, and a copy-ready cash total.

Read, trace, or print a multiplication chart from 1–12 or 1–20, with a product-free Blank mode and full keyboard operation.

Use the complete 64-codon Standard Code chart in RNA or DNA notation, with exact codon and amino-acid lookup.

Look up NIST-sourced neutral electron configurations from hydrogen through uranium, with condensed and full notation plus shell totals.

Interactive periodic table with IUPAC 2024 atomic weights and electron configurations; search, practice with hidden names, or print a blank sheet.

Convert a terminating or repeating decimal into a simplified fraction and mixed number with exact steps.

Simplify or scale a two- or three-term ratio, solve one missing proportion value, or split a total into shares.

Calculate CD interest and maturity value, compare three APYs, or test an exact early-withdrawal penalty and reinvestment break-even.

Calculate annualized growth from start, end and years or months, then copy an Excel RRI formula using annual periods.

Use the NWS wind-chill formula within its valid range, with one-decimal and whole-degree results plus model safety limits.

Find a missing side of a right triangle and see the substituted a² + b² = c² steps, square values, and labeled diagram.

Calculate a circle's area from its radius, diameter, or circumference. See the exact π form, decimal result, and related circle measurements.

Convert a circle equation between general and standard form, then see the center, radius, coefficients, and substitution steps.

Add, subtract, multiply, or divide mixed numbers with exact improper fractions, reduced answers, and explicit negative-sign parsing.

Compare circular pizza size and price by area, then find low-price combinations that meet a target area within a budget.

Audit alternating IN and OUT records, total completed work, and project clock-out time from an open IN and remaining unpaid break.

Calculate time between clock times, subtract breaks, total multiple intervals, or add and subtract days, hours, minutes, and seconds.

Estimate cubic yards and tons for up to three gravel areas, add waste or compaction, and optionally compare bulk and bag pricing.

Estimate deck boards, linear feet, fasteners, and optional cost using actual board width, gap, stock length, waste, and a separate 45-degree allowance.

Calculate a sale price or reverse the discount, then compare a multi-item cart with item discounts, an order coupon, tax, and both coupon orders.

Round an exact decimal by place and compare six methods side by side, including explicit .5 tie and negative-number direction rules.

Calculate a complete two-event probability table by choosing independent, mutually exclusive, or known-intersection mode with legal-bound checks.

Use a full positive and negative standard-normal table, highlight the exact row and column, or reverse a probability to z with adjacent-cell interpolation.

Calculate a z-score from a raw value, supplied reference mean and SD, with optional clearly qualified normal-model areas and local copy/export.

Evaluate bounded scientific expressions with DEG/RAD trig, powers, roots, logs, Ans, editable errors, and a private 20-entry in-tab history.

Simplify bounded single-variable algebra and constant complex expressions with exact steps, domain-safe stops, and private browser-only processing.

Decode or exactly encode 3-, 4-, 5-, and 6-band axial resistor colors with tolerance bounds, TCR, engineering notation, and reproducible links.

Calculate running pace, finish time, distance, speed, and reconciled equal or negative splits with exact mile and kilometer conversion.

Convert up to 100 decimal, E-notation, or ×10 values exactly, compare significant figures with fixed decimal places, and copy spreadsheet rows.

Calculate one logarithm or up to 100 values for a fixed valid real base, with change-of-base substitutions, display-precision checks, and TSV copy.

Calculate exact integer powers, digit counts and scientific notation, or check the real-number domain of negative bases with rational exponents.

Solve cost, impressions, or CPM from any two values, then audit up to 20 campaigns for true blended CPM and average-CPM bias.

Calculate simple interest by term or exact dates, compare fixed 360/365/366-day denominators, and export a monthly accrual schedule.

Find the principal square root, distinguish x²=n solutions, check your own estimate, and follow exact-comparison bisection intervals.

Calculate whole tile cartons from square footage, tile size or printed carton coverage, with allowance and carton-rounding overage kept separate.

Estimate DC voltage loss, percent drop, and load voltage from copper AWG, current, and one-way length with visible round-trip resistance math.

Calculate area fill from actual conduit inside diameter and mixed cable outside diameters, with an auditable same-unit trail and optional user-entered maximum.

Multiply two 1×1 to 6×6 matrices with exact fractions, bounded decimal results, and row-by-column steps.

Solve 2×2 or 3×3 linear systems with exact fractions, elimination steps, equation checks, and local TXT export.

Calculate rectangular sand volume, approximate short tons and whole bags, then compare your supplier's bag and bulk terms including minimum billing and delivery.

Convert hex and decimal exactly up to 64 bits, compare signed and unsigned readings, and preview width changes before losing high digits.

Explore the unit circle with exact common-angle coordinates, sin, cos and tan, degree and radian inputs, and copyable values.

Solve a quadratic equation with real or complex roots, substituted working and a graph. Paste an equation or enter its coefficients.

Convert radians and degrees in either direction, enter exact π fractions, and check decimal values, turns, and the coterminal angle position.

Calculate molecular weight and molar mass from a chemical formula, with atom counts, mass percentages, nested groups, hydrates, and clear input errors.

Compare three monthly extra-principal plans or solve the payment needed for a target payoff month on a current fixed-rate mortgage.

Estimate a fixed-rate card payoff with a cent-reconciled monthly schedule, or find the smallest whole-cent payment for a target number of months.