Calculator Hub.
A curated collection of precision tools for finance, math, health, and everyday calculations.
Finance
401k Calculator
Project 401k growth with employer match, then simulate retirement withdrawals over time.
Coast FIRE
See when your portfolio can coast to retirement on its own.
Mortgage Payoff
Measure payoff date, interest saved, and extra payment scenarios.
Cap Rate
Estimate cap rate, NOI, property value, and cash-on-cash return for rental and commercial deals.
Interest Only
Estimate IO payments, post-IO payments, and cost deltas for mortgages, HELOCs, loans, and construction draws.
Reverse Mortgage
Estimate reverse mortgage payout options, principal limit, and a 20-year equity projection without sharing personal info.
SCHD Dividend
Estimate SCHD dividend income by shares or investment, with after-tax and DRIP projections.
CD Calculator
Estimate CD maturity value, interest earned, and maturity date from APY, term, and start date.
Money Market
Calculate money market returns with APY, monthly, daily, and 7-day yield rates. Compare scenarios, visualize growth, and plan your cash savings.
Illinois Paycheck
Estimate Illinois take-home pay after federal tax, Illinois withholding, FICA, bonus pay, overtime, and common deductions.
Ohio Paycheck
Estimate Ohio take-home pay after federal tax, Ohio withholding, school district tax, FICA, bonus pay, overtime, and common deductions for 2025 and 2026.
Virginia Paycheck
Estimate Virginia take-home pay after federal tax, Virginia withholding, FICA, bonus pay, overtime, VA-4 exemptions, and common deductions for 2025 and 2026.
Georgia Paycheck
Estimate Georgia take-home pay after federal tax, Georgia withholding, FICA, bonus pay, overtime, G-4 allowances, and common deductions for 2025 and 2026.
Decimal Hours
Convert HH:MM to decimal hours for payroll, timecards, and Excel.
Hourly to Salary
Convert hourly wage to annual salary with overtime, bonus, and pay-period breakdowns, or reverse from salary to hourly.
Business
Education
Health
Blood Alcohol
Estimate blood alcohol content by weight, drink count, ABV, and hours since drinking started.
Waist-Hip Ratio
Compare waist and hip measurements with women and men screening bands using inches or cm, plus body shape, body fat, and NHS-style intent.
EtG Calculator
Estimate a urine EtG detection window by standard drinks, drinking pattern, elapsed time, and the cutoff your test uses.
A1C Calculator
Convert A1C to average glucose, estimate A1C from readings, and interpret ADA risk levels.
MAP Calculator
Calculate mean arterial pressure from systolic and diastolic blood pressure with mmHg or kPa and clinical reference notes.
Steps to Miles
Walking distance by steps, height, or exact stride.
Home
Asphalt Calculator
Estimate asphalt or bitumen tons and cost from dimensions, direct area, thickness, waste, and metric or imperial units.
Conduit Fill Calculator
Check NEC 2026 conduit fill for mixed wire sizes, Southwire and Belden seed data, Cat6, Romex, charts, and Excel export.
Concrete Block
Estimate concrete blocks for walls, steps, and whole-house projects with openings, pallets, mortar, and cost.
Drywall Calculator
Estimate drywall sheets, studs, screws, joint compound, tape, corner bead, and room material cost.
Siding Calculator
Estimate siding squares, package counts, and cost for house takeoffs, gable ends, and direct square feet.
Fence Calculator
Estimate fence length, materials, and cost with map measuring, board-on-board, and editable regional pricing.
Sod Calculator
Estimate lawn area, sod pieces, pallet counts, and USD cost.
Paver Calculator
Estimate paver counts, spacing waste, packages, and patio materials.
Pool Salt
Estimate the salt a pool needs by volume, ppm, and brand range.
Roofing Calculator
Estimate roofing squares, material quantities, and cost for roof takeoffs.
Lifestyle
Math
Cubic Feet
Calculate cubic feet from room dimensions, square feet plus depth, cylinders, logs, slabs, and metric or imperial inputs.
Percentage Calculator
Solve percentage questions, points, margins, and money cases.
Linear Regression
Calculate regression equation, slope, intercept, R², residuals, confidence intervals, prediction intervals, and detailed steps for simple and multiple linear regression.
Binomial Distribution
Calculate exact binomial probabilities, CDF tails, range probability, and exact A/B test p-values.