Calculator Directory
Calculator Categories
Browse Omniwidgets calculators by topic, including finance, automotive, engineering, education, health, marketing, math, and games.
Tools in This Category
Pick the tool that matches your task. Existing tool URLs stay short and stable.
Share Incentive Plan Calculator
Estimate UK SIP partnership shares, employer matching shares, Income Tax and National Insurance savings, projected value, and withdrawal timing impact.
CD Rate Calculator
Calculate CD interest, maturity value, APY, rate comparisons, reverse APY, taxes, and early withdrawal penalty scenarios.
Retirement Calculator
Plan retirement savings from current balance, monthly contributions, expected returns, and target age.
Wheel Bolt Pattern Calculator
Measure 4, 5, 6, and 8 lug wheel bolt patterns, convert inches to millimeters, compare common sizes, and check wheel fitment basics.
Horsepower Calculator
Calculate horsepower from torque and RPM, estimate torque from HP and RPM, and convert engine power to watts or kilowatts.
Power-to-Weight Ratio Calculator
Calculate HP per pound, HP per 1,000 lb, lb per HP, W/kg, weight-loss equivalent horsepower, and compare two setups.
HP to Watts Converter
Convert horsepower to watts or kilowatts, convert watts back to HP, and compare mechanical horsepower with metric horsepower.
Bike Tire Pressure Calculator
Calculate front and rear bike tire pressure in PSI and BAR for road, gravel, and MTB, with surface, setup, rim, and safety notes.
BMEP Calculator
Calculate brake mean effective pressure from torque, displacement, and engine cycle, with results in bar, psi, and kPa.
Sun Angle Calculator
Calculate solar elevation, azimuth, zenith angle, shadow length, sunrise, and sunset from location, date, and time.
HP to Watts Converter
Convert horsepower to watts or kilowatts, convert watts back to HP, and compare mechanical horsepower with metric horsepower.
AM Modulation Calculator
Calculate AM modulation index, percent modulation, sideband power, total power, and bandwidth from carrier and message values.
Frequency Modulation Calculator
Calculate FM modulation index, Carson bandwidth, frequency deviation, and approximate occupied range for frequency modulation.
Roof Pitch Calculator
Calculate roof pitch from rise and run, convert pitch to degrees or percent slope, and check a roof pitch chart.
AC Tonnage Calculator
Estimate air conditioner tonnage, BTU per hour, and nearest common HVAC size from square footage and room conditions.
Pool Salt Calculator
Calculate pool salt by gallons or litres, current ppm, target ppm, bag size, and get pounds, kg, bags, and a shareable result.
Boiler Feed Pump Calculator
Size boiler feed pump flow, total dynamic head, and motor power with metric and imperial inputs.
Bitumen Calculator
Estimate bitumen quantity, weight, and cost for prime coat, tack coat, spray seal, and asphalt mix.
AP Lang Score Calculator
Estimate your AP English Language score from MCQ correct answers and FRQ essay points, including composite score and next-score targets.
UIU CGPA Calculator
Calculate UIU semester GPA, projected CGPA, grade points, and retake impact with a mobile-friendly United International University calculator.
FIT File Analyzer Online
Analyze Garmin, Strava, Wahoo, and Zwift FIT files in your browser, check data streams, file health, and export activity records to CSV.
Mental Status Exam Template
Generate a structured MSE documentation note with common descriptors, copy-paste output, blank template, and print-to-PDF support.
Therapy Productivity Calculator
Calculate PT, OT, and SLP productivity with billable minutes, lunch impact, documentation time, target percentage, and copyable results.
PFT Calculator
Score physical fitness tests for USMC, Air Force, Army, and Navy, with goal planning for target scores.
CPM Calculator
Calculate advertising CPM, campaign cost, impressions, and compare campaign efficiency for YouTube, TikTok, display, PR, and media buys.
Cleaning Cost Calculator
Estimate house cleaning, deep cleaning, move-out, and office cleaning cost by square feet, rooms, bathrooms, frequency, and add-ons.
Sandbag Calculator
Calculate how many sandbags you need for flood barriers, doorways, berms, and fill, including sand volume, weight, and cost.
Trash Bag Size Calculator
Find the right trash bag size for round, square, or rectangular cans with liner width, height, gallons, and common bag sizes.
Bag Volume Calculator
Calculate bag volume in liters, cubic inches, and cubic feet for backpacks, duffels, luggage, flat bags, and gusseted bags.
Roof Pitch Calculator
Calculate roof pitch from rise and run, convert pitch to degrees or percent slope, and check a roof pitch chart.
AC Tonnage Calculator
Estimate air conditioner tonnage, BTU per hour, and nearest common HVAC size from square footage and room conditions.
Pool Salt Calculator
Calculate pool salt by gallons or litres, current ppm, target ppm, bag size, and get pounds, kg, bags, and a shareable result.
Boiler Feed Pump Calculator
Size boiler feed pump flow, total dynamic head, and motor power with metric and imperial inputs.
Percentage Calculators Hub
Calculate percent of a number, percent of total, increase, decrease, difference, marks, discounts, and money percentages in one hub.
3D Graphing Calculator
Plot 3D surfaces, parametric curves, and preset math shapes online with rotate, zoom, copy, and PNG export.
Racine Carree Calculator
Calculate square roots online with decimal values, simplified radicals, perfect-square status, and step-by-step work in English.
Gematria Calculator
Calculate gematria values for words and phrases using Hebrew, English, and simple gematria systems.
BGSI Calculator
Calculate Bubble Gum Simulator Infinity luck, hatch chance, egg odds, and target hatches for 50%, 90%, or 99% chance.
FLAMES Calculator
Play the classic FLAMES love game by name, calculate a compatibility result, and try optional twin flame birthday mode.