Every calculator on CalcAxis, grouped by category. Each tool keeps its formula or methodology next to the result so the numbers are easy to check.
112 calculators across 19 categories
Estimate future value and interest earned from principal, rate, time, and compounding frequency.
Calculate the monthly payment on a fixed-rate mortgage from price, down payment, rate, taxes, insurance, PMI, HOA, and extra principal.
Settle and split a bill in seconds.
Calculate a loan payment, total interest, payoff time, and the effect of extra monthly principal.
Estimate how long a credit-card balance takes to pay off and how much interest the payment plan costs.
Project a savings balance from a starting deposit, recurring contributions, compounding, and inflation assumptions.
Translate an amount across years and see how inflation changes its future value and purchasing power.
Move between cost, price, profit, margin, and markup with optional discount and sales-tax adjustments.
Estimate marketplace fees, payout, and direct-cost profit with a transparent Etsy order breakdown.
Compare simple ROI, annualized return, marketing ROI, ROAS, and net profit from transparent assumptions.
Estimate the direct cost of a meeting from duration, attendee count, and compensation assumptions.
Connect current savings, contributions, return assumptions, and income targets to a retirement projection.
Find official state, federal, and jurisdictional child-support guidance without entering family financial data.
Compare leasing and buying over the same horizon, including payments, mileage, financing, depreciation, and equity.
Answer the three percentage questions people ask most, with the right inputs for each one.
Add, subtract, multiply, or divide fractions and see the reduction steps.
Summarize a dataset with mean, median, mode, range, and standard deviation.
Calculate the area of common 2D shapes and see the applicable perimeter or circumference.
Calculate volume for common solids with a clear formula and surface-area context where available.
Find an exact or approximate square root, bracket non-perfect squares, and understand negative inputs.
Calculate powers with positive, zero, negative, and fractional exponents, including readable notation.
Add and subtract up to four polynomials, combine like powers, and keep the operation visible.
Check whether a whole number is prime, list its factors, and show nearby prime numbers.
Find the least common multiple and greatest common factor for two or more whole numbers.
Solve a transparent one-variable linear equation and verify the result step by step.
Compare two values or apply a percentage change without losing the absolute difference.
Convert between metric and imperial units across length, mass, volume, and temperature.
Convert between Celsius, Fahrenheit, and Kelvin with formula shown.
Find the exact calendar and total-day difference between two dates.
Add or subtract years, months, weeks, days, or business days from a date.
Calculate elapsed time or add hours, minutes, and seconds across midnight.
Track up to two shifts per day, unpaid breaks, weekly totals, and overtime in a printable summary.
Convert Unix seconds or milliseconds to dates and convert date/time values back to timestamps.
Find the ISO or US week for a date, or turn a week number back into its date range.
Calculate exact age in years, months, and days, then see the next birthday.
Count weekdays between dates or add working days while excluding weekends and entered holidays.
Compute mean, variance, and standard deviation for a dataset.
Estimate body mass index from height and weight, with adult screening category context.
Estimate energy expenditure from activity, body weight, and duration using MET values.
Estimate aerobic capacity from a heart-rate ratio or a timed running effort.
Estimate total daily energy expenditure from body measurements, activity, and goal context.
Estimate a one-repetition maximum from a completed weight and rep set across common formulas.
Estimate body-fat percentage from height and circumference measurements using the U.S. Navy method.
Estimate cardiac output and cardiac index from oxygen content and Fick-method inputs.
Estimate an ovulation day and fertile window from the first day of a period and cycle length.
Model a conservative, moderate, or aggressive calorie target and projected weight-loss pace.
Estimate daily protein, carbohydrate, and fat targets from body measurements, activity, and a goal.
Compare recent sleep with an age-based target and estimate accumulated sleep debt or surplus.
Compare pregnancy weight gain with broad Institute of Medicine ranges by pre-pregnancy BMI.
Estimate a pregnancy due date from the last menstrual period, conception, or IVF transfer date.
Estimate take-home pay from a frequency-safe annual tax basis, with payroll and retirement deductions visible.
Compare hourly pay with annual compensation, overtime, unpaid time off, and an optional take-home estimate.
Build a quarterly tax reserve from revenue, business costs, self-employment tax, deductions, and payments already made.
Project a 401(k) balance with employee contributions, an employer match capped by salary, returns, and inflation.
Estimate all-in monthly housing cost, upfront cash, lifetime interest, PMI, maintenance, and a housing-plus-debt ratio.
Check target rent against gross income, utilities, required housing costs, debt, and the monthly cash left over.
Estimate annual and periodic property tax from a local effective rate or a directional state reference, assessment ratio, and exemptions.
Connect acquisition cash, vacancy, operating costs, financing, and rent to pre-tax monthly cash flow and cash-on-cash return.
Compare cumulative rent with net ownership cost including equity, entry and sale costs, and foregone growth on upfront cash.
Estimate device-level monthly and annual electricity cost, compare the largest loads, and model up to six appliances from actual usage patterns.
Estimate a bill from your actual rate and fees or compare transparent flat, tiered, and time-of-use example structures.
Turn slicer weight or filament length into per-print cost, batch demand, waste and failure allowance, and an inventory shortfall plan.
Screen a rooftop system against usable roof capacity, current electricity use, target bill offset, installed cost, degradation, and verified incentives.
Model simple payback, break-even, NPV, IRR, levelized cost, degradation, rate escalation, export value, maintenance, and optional financing.
Estimate upload, download, backup, or migration time from dataset size, connection speed, and realistic sustained efficiency.
Plan simultaneous household or office activity with visible headroom, or calculate data transferred at sustained bandwidth.
Move between pixel dimensions, physical size, and resolution without losing aspect-ratio and megapixel context.
Plan a pre-slicer FDM job from part envelope, layer profile, infill, supports, speed, overhead, setup, and sequential quantity.
Check a masked password locally or generate one with browser cryptographic randomness—without putting the secret in URLs, analytics, or sharing.
Calculate a sale price, reverse a discount, or stack multiple offers and tax in the order checkout applies them.
Normalize mixed package sizes and rank up to six products by unit price, including the gap to the next-best option.
Add tax, remove tax from a total, or infer an effective rate with state-average and custom-rate modes.
Normalize weekly, monthly, quarterly, and yearly bills, separate active from paused items, and surface the largest review opportunity.
Price a trip for gasoline, diesel, E85, LPG, or an electric vehicle, split the cost across passengers, plan refuelling stops, and compare two vehicles side by side.
Measure the straight-line, road, and flight distance between two cities or any two coordinates, with driving estimates shown only where a road route actually exists.
Convert a wall-clock time between zones with daylight-saving-accurate offsets, see when a local time is skipped or repeated by a clock change, and find the working-hours window everyone shares.
Estimate an annual per-person carbon footprint from driving, flights, home energy, and diet, then see which single change would cut the most, sized from your own numbers.
Look up the recorded high, low, and rainfall for a destination on any past date, and compare it with the ten-year normal for the same calendar day.
Work out how much paint a room needs from its dimensions, doors, windows, and coat count, then solve for the cheapest combination of tins that actually covers it.
Size a slab, footing, round column, wall, or flight of stairs with thickness in its own unit, then compare bagging the pour against a ready-mix delivery.
Estimate tiles, boxes, and setting materials for a room from the real row-by-row layout, with grout taken from the joint geometry and no grout quoted for a floating floor.
Turn a finished concrete volume into cement, sand, gravel, and water for a chosen strength, working back through an explicit dry-volume factor rather than splitting the wet volume.
Estimate joint compound, tape, and corner bead from the seams and corners a room actually contains, coat by coat, to the GA-214 finish level you are working to.
Measure the water in a rectangular, round, oval, kidney, or freeform pool, weighting a compound floor by the length of each run, and estimate the time to fill it.
Dose chlorine, pH, alkalinity, hardness, stabiliser, and salt from your current readings to your targets, in the order the adjustments should be made, with a saturation index for the water as a whole.
Calculate a term or cumulative GPA on a weighted or unweighted scale, with honors and AP weighting, pass/fail exclusion, a prior transcript, and target planning.
Turn points into a percentage and a letter on the scale your school actually uses, with weighted categories, extra credit accepted, and the distance to the next letter.
Find the score you need across everything still to be graded to reach a target grade or letter, with the best and worst final grade still possible.
Estimate an AP score from multiple-choice and free-response performance, with the weighted composite, the full threshold table, and what the next score would cost on each section.
Estimate cloth for a garment at your fabric's actual width, with pattern repeat matching computed from the repeat length, nap layouts, shrinkage, lining, and a quantity rounded to what the shop will cut.
Choose a seam allowance for a garment and fabric, see the cloth a seam actually consumes, and convert a pattern from one allowance to another — with fractions reduced and metric paired the way patterns print it.
Grade a pattern between any two sizes from your own base measurements, with per-measurement grade rules, a wider grade above L, and the amount to slash and spread at each pattern quarter.
Convert the units a workroom actually uses: fractional inches, yards and metres, fabric weight between gsm and ounces per square yard, and iron temperatures by fibre.
Get one coherent machine setup — needle point, needle size, thread, stitch length, and tension — resolved from your fabric, its weight, and the project together.
Convert a full set of body measurements between fractional inches and centimetres, and map them onto a published size chart to see which pattern size to cut.
Scale a recipe by servings, by a factor, or by pan size, with practical fractions, part eggs given as a weight, and the ingredients that do not scale linearly handled as such.
Convert kitchen volume, weight, and oven temperature, and turn a cup measure into a weight using the ingredient's own density and the way the cup was filled.
Work a formula in baker's percentages against the total of every flour in the dough, with hydration, salt, and dough weight derived and any preferment split into its flour and water.
Get the coffee and water for your brew method and strength, with espresso modelled as dose to yield, cold brew's dilution computed, and the ratio you see the ratio it used.
Convert an oven recipe to air fryer time and temperature by what you are actually cooking, with a check-early time, the safe internal temperature, and a batch count.
Cost a recipe from real purchase prices, reconciling purchase units against recipe units and adjusting for yield loss, then price it against your own target.
Convert your dog's age to human years by a named, cited method, with the size band derived from weight and life stages that move with size.
Estimate the first-year and lifetime cost of a pet in both cash and today's money, with a provision for unplanned veterinary care and every baseline replaceable.
Predict foal coat colour across seven loci, enumerating the genotypes each parent's coat is consistent with instead of assuming one, and naming what a test would settle.
Calculate engagement rate by followers or by reach, with saves and shares included, a median across posts, and a verdict against the benchmark for your own follower tier.
Screen a list of keywords with the Keyword Golden Ratio, with the allintitle query built for each one and the method's scope stated rather than enforced by a block.
Find pace, time, or distance from the other two, with a full split table at your own interval, even and negative split plans, race predictions, and training paces.
Score a game from standard notation with live frame totals, the range still achievable mid-game, league handicap, and a series average.
Work out how unlikely your dry streak is at any drop rate, and how many more attempts a 50%, 90%, or 99% chance actually takes.
Work out effective damage per second from attack speed, accuracy, crits, buffs, and mitigation, and compare two builds side by side with a time to kill.
Find the experience between two levels on a chosen curve — including the published RuneScape table — with the time, actions, and milestones to get there.
Estimate the time to farm a quantity, a specific drop, or a full set, with the drop rate, run length, and your real session availability.