Calculator Tools
102 tools · 102 available now
Everyday and specialised calculators — percentage, loan, BMI, tax, TDEE, ratio, unit conversion, construction estimators, citation generators, and a full set of math and finance tools.
Age Calculator
Calculate exact age in years, months, and days.
Date Difference Calculator
Find the exact difference between two dates.
Date Add & Subtract
Add or subtract days, months, and years from a date.
Percentage Calculator
Solve percentage problems in several modes.
BMI Calculator
Calculate your Body Mass Index from height and weight.
BMR Calculator
Estimate your Basal Metabolic Rate.
Loan & EMI Calculator
Calculate loan EMIs with a full amortization schedule.
Mortgage Calculator
Estimate mortgage payments with full amortization.
Mortgage Affordability Calculator
Estimate how much mortgage you can afford.
Calorie Calculator
Estimate your daily calorie needs.
Macro Calculator
Calculate a daily macronutrient split.
Body Fat Calculator
Estimate body fat percentage with the Navy method.
Ideal Weight Calculator
Estimate ideal weight using several formulas.
Tax Bracket Calculator
Estimate income tax across tax brackets.
GST Calculator
Calculate GST-inclusive and exclusive amounts.
VAT Calculator
Add or remove VAT from any amount.
Tip Calculator
Calculate tips and split the bill.
Unit Converter
Convert between length, weight, volume, and more.
Time Zone Converter
Convert times across world time zones.
Discount Calculator
Work out sale prices and savings.
Compound Interest Calculator
Calculate compound interest growth over time.
Simple Interest Calculator
Calculate simple interest on a principal.
Aspect Ratio Calculator
Calculate aspect ratios for images and video.
Pixel to em & rem Converter
Convert pixels to em and rem units.
Pixel to Percentage Converter
Convert pixel values to percentages.
Tip Splitter
Split a bill and tip evenly across a group.
Roman Numeral Converter
Convert between numbers and Roman numerals.
Number to Words Converter
Convert numbers into written words.
Fibonacci Generator
Generate the Fibonacci sequence up to any term.
Prime Number Checker
Check whether a number is prime.
Prime Number Generator
Generate primes with the Sieve of Eratosthenes.
Factorial Calculator
Calculate factorials, even for very large numbers.
GCD & LCM Calculator
Find the GCD and LCM of multiple numbers.
Quadratic Equation Solver
Solve quadratic equations, including complex roots.
Triangle Calculator
Solve triangles from sides and angles.
Circle Calculator
Calculate circle area, circumference, and more.
Probability Calculator
Calculate basic probabilities.
Permutation & Combination Calculator
Calculate permutations (nPr) and combinations (nCr).
Centimetres to Inches
Convert centimetres to inches — 1 in = 2.54 cm exactly.
Inches to Centimetres
Convert inches to centimetres — 1 in = 2.54 cm exactly.
Kilograms to Pounds
Convert kilograms to pounds (lb) — 1 lb = 0.45359237 kg.
Pounds to Kilograms
Convert pounds (lb) to kilograms — 1 lb = 0.45359237 kg.
Celsius to Fahrenheit
Convert °C to °F using F = C × 9/5 + 32.
Fahrenheit to Celsius
Convert °F to °C using C = (F − 32) × 5/9.
Metres to Feet
Convert metres to feet — 1 ft = 0.3048 m exactly.
Feet to Metres
Convert feet to metres — 1 ft = 0.3048 m exactly.
Kilometres to Miles
Convert kilometres to miles — 1 mi = 1.609344 km.
Miles to Kilometres
Convert miles to kilometres — 1 mi = 1.609344 km.
Millilitres to Ounces
Convert millilitres to US fluid ounces (fl oz).
Ounces to Millilitres
Convert US fluid ounces (fl oz) to millilitres.
Millimetres to Inches
Convert millimetres to inches — 1 in = 25.4 mm exactly.
Concrete Calculator
Calculate concrete cubic yards and bag counts for slabs, footings, columns and walls.
Square Footage Calculator
Calculate square footage for rectangles, circles, triangles and irregular rooms.
Gravel Calculator
Calculate cubic yards and tons of gravel for driveways, paths and french drains.
Mulch Calculator
Calculate cubic yards and bags of mulch needed for any garden bed.
Asphalt Calculator
Calculate tons of hot-mix asphalt needed to pave a driveway or parking lot.
Paint Calculator
Calculate gallons of paint needed for any wall, ceiling, or room repaint.
Drywall Calculator
Calculate drywall sheets needed for any wall or ceiling, including waste factor.
Tile Calculator
Calculate tile count and waste factor for floors, walls, and backsplashes.
Roofing Calculator
Calculate roofing squares and shingle bundles by pitch, area, and overhang.
Pool Volume Calculator
Calculate pool volume in gallons or litres for rectangular, oval and round pools.
Sod Calculator
Calculate sod pieces and pallets needed to lay a new lawn.
Pool Salt Calculator
Calculate pounds of pool salt needed to reach your saltwater chlorinator target.
BTU Calculator
Calculate cooling BTU needed for a room by size, climate, insulation and sun.
Pool Chemicals Calculator
Calculate chlorine, salt, pH and alkalinity doses for any pool size.
Siding Calculator
Calculate siding squares needed after subtracting window and door openings.
Deck Calculator
Calculate deck boards, joists and lumber for a wood or composite deck.
Tree Removal Cost Calculator
Estimate tree removal cost by size, accessibility, and stump grinding option.
Moving Cost Calculator
Estimate moving cost by home size, distance, packing and storage options.
CPM Calculator
Calculate advertising cost per mille (CPM) — convert between cost, impressions and CPM.
Chronological Age Calculator
Calculate exact chronological age in years, months, and days for clinical and educational testing.
Body Shape Calculator
Classify body shape as hourglass, pear, apple, rectangle, or inverted triangle from your measurements.
A1C Calculator
Convert between A1C (HbA1c) and estimated average glucose (eAG) in mg/dL or mmol/L.
No-Vig Calculator
Strip the vig from sportsbook odds to find fair implied probabilities and fair odds.
TDEE Calculator
Calculate Total Daily Energy Expenditure (TDEE) from BMR plus activity level.
Percentage Increase Calculator
Calculate the percentage increase between two values, with step-by-step working.
Percentage Decrease Calculator
Calculate the percentage decrease between two values, with the full step-by-step.
Percentage Difference Calculator
Calculate the symmetric percentage difference between two values using the average as base.
Percentage Change Calculator
Calculate the signed percentage change between two values — positive for growth, negative for drop.
Percentage Off Calculator
Apply a percentage-off discount, or reverse-engineer the original price from a sale price.
Ratio Calculator
Simplify ratios, find equivalent ratios, and scale a ratio so one side hits a target value.
Hours to Decimal Calculator
Convert hours and minutes to decimal hours for payroll timesheets and back again.
Time to Decimal Calculator
Convert HH:MM:SS time values to decimal hours and back, including seconds precision.
Fraction to Decimal Calculator
Convert any fraction to its decimal — or any decimal to its best-fit fraction with mixed number.
AMA Citation Generator
Build AMA-style references for journal articles, books, websites, and more — AMA Manual 11th ed.
Chicago Citation Generator
Build Chicago-style references in either Notes-Bibliography or Author-Date system — CMOS 17th ed.
IEEE Citation Generator
Build IEEE-style numbered references with bracket-numeric inline citations for engineering papers.
ACS Citation Generator
Build ACS-style chemistry references with italic journal abbreviations — ACS Style Guide 4th ed.
CSE Citation Generator
Build CSE-style biology references in either Citation-Sequence or Name-Year — Scientific Style 9th ed.
Dividend Calculator
Project dividend income with DRIP, expected growth, and year-by-year compounding.
Markup Calculator
Calculate selling price, profit margin, or markup from any two values — bidirectional.
Salary Increase Calculator
Project your new salary from a percentage or dollar raise, with optional after-tax estimate.
Time and a Half Calculator
Calculate overtime pay at 1.5× and optional double-time rates per US FLSA rules.
Cap Rate Calculator
Calculate real-estate capitalization rate from NOI and property value — bidirectional.
Salary Raise Calculator
Calculate the percentage raise between an old and new salary, plus the absolute dollar increase.
Debt Snowball Calculator
Plan a debt payoff schedule using the snowball or avalanche method with extra monthly payments.
eBay Fee Calculator
Calculate eBay final value fees, per-order fees, and net seller payout for 2026 fee structure.
Waist to Hip Ratio Calculator
Calculate waist-to-hip ratio and WHO cardiovascular risk band from your measurements.
IVF Due Date Calculator
Estimate IVF or FET due date from transfer date and embryo type — Day 3, Day 5, or frozen.
Army Body Fat Calculator
Estimate body fat from circumference measurements using the legacy Army tape-test method.
Running Calorie Calculator
Estimate calories burned per run from weight, pace, and distance using METs methodology.
Dosage Calculator
Educational mg/kg pediatric dosing reference — for learning only, not clinical decisions.
About calculator tools
From working out a loan EMI to estimating concrete for a slab, converting hours to decimal for payroll, comparing two percentages, generating an AMA citation for a paper, or checking a BMI, calculators are some of the most useful tools on the web. ToolJutsu's calculator collection spans dates and ages (including a precise chronological-age tool for clinical workflows), the full percentage family (increase, decrease, change, difference, off), finance (loan, mortgage, interest, tax, CPM advertising, dividend, cap rate, debt snowball, eBay fees, salary raise, time-and-a-half), health estimates (BMI, BMR, TDEE, A1C, body shape, waist-to-hip, IVF due date, army body fat, running calories, dosage), construction and home-improvement (concrete, paint, drywall, tile, roofing, pool volume), academic citations (AMA, Chicago, IEEE, ACS, CSE), and pure math (primes, factorials, quadratic equations, ratios, geometry). Financial, health, and construction calculators carry a clear disclaimer because they provide estimates based on standard formulas — they are a helpful starting point, not professional advice.
Every tool in this category runs entirely on your device. Your files and inputs are never uploaded to a server — there is no server in the loop that touches your data. That makes ToolJutsu a genuinely private way to get everyday tasks done. New tools in this category go live as the project progresses; cards marked “Soon” are on the roadmap.