Professional Calculators. Real Results.

27 calculator suites · 100+ individual tools across Finance, Health, Tech, and Life.

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27 categories · 100+ tools

Finance & Capital

Mortgages, loans, interest & tax
12 tools ▼
Mortgage & Amortization
Monthly payment, total interest & year-by-year payoff schedule
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Compound Interest
Project investment growth with compounding frequency
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Loan Payoff Schedule
Full amortization table for any personal or auto loan
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Salary Converter
Hourly ↔ annual ↔ monthly income in seconds
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Debt Payoff Planner
Snowball vs. avalanche strategy comparison
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Net Worth Audit
Total assets minus liabilities with breakdown
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Tax Estimator
Federal income tax and effective rate by bracket
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Inflation Calculator
Real purchasing power loss over time using CPI
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FIRE Number
Financial independence target using the 25x / 4% rule
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401(k) Optimizer
Projected retirement balance with employer match modeling
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Student Loan Payoff
Months to zero and interest saved with extra payments
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HELOC Borrowing Power
Available credit line based on equity and CLTV ratio
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Savings & Budget

Smart spending & debt strategies
5 tools ▼
Discount & Sale Price
Final price, savings amount & effective discount %
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Credit Card Payoff
Months to zero balance & total interest cost
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50/30/20 Budget
Split take-home income into Needs, Wants & Savings
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Unit Price Comparison
Which size or brand gives the best cost-per-unit?
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Emergency Fund
Target size, gap & time-to-fully-funded
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Investing & Crypto

Markets, portfolios & DCA
4 tools ▼
DCA Simulator
Dollar-cost averaging returns vs. lump sum investment
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Crypto P&L
Profit / loss on any crypto trade with fee deduction
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Stock Options Value
Intrinsic value and breakeven for calls & puts
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Portfolio Rebalancer
Calculate buy/sell amounts to hit target allocation
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Real Estate

Buy, rent, invest & close
4 tools ▼
Rent vs. Buy Analysis
Total 30-year cost comparison with amortization schedule
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Home Affordability
Max purchase price at 28% and 36% debt-to-income ratios
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Rental Cap Rate & ROI
Cash-on-cash return, cap rate & net operating income
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Closing Cost Estimate
Buyer & seller closing cost breakdown by purchase price
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Small Business

Startups, unit economics & growth
4 tools ▼
Burn Rate & Runway
Months of cash remaining at current monthly burn
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Break-Even Point
Units and revenue needed to cover all costs
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LTV / CAC Ratio
Customer lifetime value vs. acquisition cost benchmark
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Profit Margin & Markup
Gross/net margin and markup % from cost & price
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Digital Marketing

Ads, email & conversion ROI
4 tools ▼
ROAS & Ad ROI
Return on ad spend and blended campaign profitability
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CPC → CPA Converter
From click costs to cost per acquisition via conversion rate
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Email List Value
Estimated annual revenue per subscriber on your list
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Conversion Rate Calculator
CVR, leads, and revenue from traffic & conversion data
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Career & Income

Offers, rates & raise negotiation
4 tools ▼
Job Offer Analyzer
Compare offers by total annual comp including benefits
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Freelance Rate Calculator
Your minimum billable rate based on income goals & overhead
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Raise ROI
Lifetime earnings impact of a percentage salary increase
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Side Hustle Planner
Revenue, hours, and effective hourly rate of a side project
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Logistics & Enterprise

Operations, meetings & inventory
4 tools ▼
Meeting Cost Auditor
Real dollar cost of any meeting by team size & salaries
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EOQ Inventory
Optimal reorder quantity to minimize holding & order costs
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Safety Stock & Lead Time
Buffer stock needed based on demand variability
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Team Productivity Index
Output per hour and efficiency ratio for any team
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Health & Vitality

BMI, nutrition & body metrics
5 tools ▼
BMI Calculator
Body Mass Index with WHO weight category classification
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TDEE & Calorie Needs
Total daily energy expenditure by activity level
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Macros Planner
Daily protein, carb & fat targets by goal and activity
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Body Fat %
Estimated body fat using the US Navy circumference method
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Daily Water Intake
Hydration target based on weight, climate & activity
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Life Planning

Education, family & milestones
4 tools ▼
College 529 Savings
Monthly savings needed to hit a tuition target by year
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Wedding Budget Planner
Itemized budget breakdown with per-guest cost analysis
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Baby Cost Planner
First-year and ongoing annual cost of raising a child
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Age & Milestone Tracker
Days lived, upcoming milestones & birthday statistics
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Pet Health

Age, nutrition & toxicity
3 tools ▼
Pet Age Converter
Dog & cat age in human years by breed and size
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Pet Calorie Needs
Daily caloric requirement by weight, species & activity
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Toxicity Alert
Safe dose thresholds for chocolate, grapes & common toxins
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AI & Cloud Costs

LLMs, tokens & GPU ROI
4 tools ▼
LLM API Cost Matrix
Monthly cost of GPT-4o, Claude, Gemini & more by usage
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GPU Infrastructure ROI
Cloud vs. on-prem GPU cost-benefit analysis
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Token Estimator
Estimate token count from word count for any LLM
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SaaS AI Cost ROI
Build vs. buy analysis for AI-powered product features
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Engineering

Electrical & power calculations
4 tools ▼
AC/DC Power Load
Watts, amps & voltage using Ohm's law for single-phase
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3-Phase Power
kVA, kW and current in balanced 3-phase systems
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Component Drift
Tolerance & thermal drift for resistors, caps & sensors
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Voltage Drop
Line voltage loss by wire gauge, length & load current
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Science & Lab

Chemistry & physical science
4 tools ▼
Molarity Calculator
Moles, grams and concentration for any solution
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C1V1 Dilution
Stock concentration and volume needed for target dilution
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Ideal Gas Law (PV=nRT)
Solve for pressure, volume, temperature or moles
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Molecular Weight
Molar mass from chemical formula using periodic table data
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Academic & Research

Grades, citations & h-index
4 tools ▼
Grade Curve
Curve a class distribution to a target average
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h-Index Projection
Estimated academic h-index from publication & citation data
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GPA Calculator
Semester and cumulative GPA from course grades & credits
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Citation Impact
Research impact score from citation counts & paper age
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Auto & Transport

EV, loans, leases & fuel
4 tools ▼
EV vs. Gas Savings
Annual fuel savings switching to an electric vehicle
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Lease vs. Buy Analysis
True total cost comparison over the full ownership period
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Auto Loan Amortization
Monthly payment & full payoff schedule with extra payments
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MPG & Fuel Cost
Real-world MPG from fill-up data and annual fuel spend
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Travel & Nomad

Visas, currency & trip budgets
3 tools ▼
Schengen Visa Timer
Track remaining days in the Schengen 90/180-day rule
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Live Currency Converter
Real-time exchange rates for 150+ world currencies
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Trip Budget Planner
Daily spend budget breakdown by category for any destination
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Sustainability

Solar, carbon & energy costs
3 tools ▼
Carbon Footprint
Annual CO₂ emissions from transport, diet, and home energy
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Solar Panel ROI
Payback period and 25-year savings on a solar installation
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Appliance Energy Cost
Monthly electricity cost of any appliance by wattage & usage
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DIY & Project

Concrete, paint & lumber
3 tools ▼
Concrete Volume
Cubic yards and bag count for any slab, footing or column
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Paint Coverage
Gallons needed for any room based on area and coat count
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Board Foot Lumber
Board feet and cost estimate for any lumber order
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Audio & Music

BPM sync, room modes & mixing
4 tools ▼
BPM to Milliseconds
Note-length delay times for any tempo in ms and Hz
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Room Mode Calculator
Axial, tangential & oblique room modes for studio treatment
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Frequency & Wavelength
Hz ↔ wavelength converter with octave and note mapping
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RT60 Reverb Decay
Estimated room reverb time from volume and absorption
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Gaming & RNG

Probability, DPS & streaming
4 tools ▼
Gacha Probability
Expected pulls to guaranteed drop at any drop rate & pity
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DPS Calculator
Effective DPS with crit rate, multiplier & attack speed
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Streamer Revenue
Estimated monthly income from subs, ads & donations
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Bitrate & Storage
File size and hours of footage at any resolution & bitrate
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Culinary

Baking ratios & cocktail batching
2 tools ▼
Baker's Percentage
Scale any bread recipe by weight using baker's math
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Cocktail Batch Scaling
Scale any cocktail recipe to any number of servings
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Psychology & Behavior

Habits, decisions & cognitive tools
3 tools ▼
Habit Formation Timer
Days to automaticity based on behavior complexity science
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Decision Matrix
Score competing options by weighted criteria for clarity
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Cognitive Load Index
Estimate mental complexity of a task or UX flow
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Spiritual

Numerology & moon phases
2 tools ▼
Life Path Number
Numerology life path from birth date with meaning guide
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Moon Phase Finder
Current and historical moon phase for any date
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Tactical & Survival

Ballistics & field preparedness
2 tools ▼
Ballistics / Bullet Drop
Trajectory and drop at distance for rifle & projectile data
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Water Purification Ratio
Bleach-to-water ratio for safe emergency disinfection
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Fitness & Training

VO₂ Max, 1RM & race pace
5 tools ▼
VO₂ Max Estimator
Aerobic capacity from resting HR or timed run test
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1-Rep Max (1RM)
Max lift weight from submaximal reps using 7 formulas
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Race Pace Calculator
Target pace, finish time and speed for any race distance
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Heart Rate Zones
5-zone HR training ranges from max HR or Karvonen formula
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Calorie Burn by Activity
kcal burned for 60+ activities using MET values
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Medical & Clinical

Dosing, IV & body composition
5 tools ▼
Drug Dosage Calculator
Weight-based single and daily dose with concentration in mL
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IV Drip Rate
Drops per minute and mL/hr for any IV infusion setup
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Ideal Body Weight (IBW)
Devine IBW and adjusted BW for pharmacokinetic dosing
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Creatinine Clearance
GFR estimate and CKD stage via Cockcroft-Gault equation
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Caloric Deficit Timeline
Weeks and date to reach target weight at chosen deficit
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Parenting & Family

Baby cost, allowance & child tools
5 tools ▼
First-Year Baby Cost
Estimated first-year and 18-year child-raising cost
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Allowance Growth Planner
Total given and saved to age 18 with annual raises
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School Start Age
Kindergarten year and grad year by state cutoff date
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Child BMI by Age
CDC percentile and weight category for ages 2–19
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Teen Insurance Estimator
Estimated auto insurance premium increase with teen driver
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Productivity & Time

Focus, meetings & deep work
5 tools ▼
Pomodoro Day Planner
Total focus sessions and break time for any work day
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Deep Work Capacity
Actual focus hours after meetings and interruption costs
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Meeting ROI Calculator
Real dollar cost of meetings by team size and hourly rate
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Eisenhower Prioritizer
Classify any task by urgency and importance quadrant
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Email Time Cost
Annual salary cost and % of workday lost to email processing
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Math & Geometry

Quadratic, triangle, circle & sequences
5 tools ▼
Quadratic Formula Solver
Roots, discriminant and vertex of any quadratic equation
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Triangle Area (Heron's)
Area and type classification from three side lengths
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Circle / Sphere / Cylinder
Area, circumference, surface area and volume for round shapes
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Percentage Change
% change, absolute difference and reverse percentage
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Fibonacci Sequence
Generate any length sequence and golden ratio approximation
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Legal & Tax

SE tax, capital gains & business structures
5 tools ▼
Self-Employment Tax
SE tax, deductible half, and net after-tax income estimate
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Capital Gains Tax
Short and long-term gains tax owed from any asset sale
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Depreciation Schedule
MACRS and straight-line depreciation for any business asset
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LLC vs. S-Corp Tax
Self-employment tax savings from S-Corp election at any income
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QBI Deduction (§199A)
20% pass-through deduction eligibility and amount estimate
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Unit Converters

Length, weight, temp & cooking
4 tools ▼
Length Converter
Metric ↔ imperial: mm, cm, m, km, in, ft, yd, mi
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Weight Converter
kg, g, lbs, oz, stone & more unit conversions
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Temperature Converter
°C ↔ °F ↔ K with formula explanation
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Cooking Unit Converter
Cups, tbsp, tsp, ml, oz and grams for any ingredient
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