48 FREE CALCULATORS · UPDATED FOR 2026

The math you'd rather not
do by hand.

Plain, fast, ad-supported calculators for construction estimates, retirement planning, and tax prep. No accounts, nothing saved.

Browse all calculators How we verify formulas
✓ Updated for 2026 tax brackets
✓ Waste factors built in
✓ No signup, no saved data
✓ Formulas reviewed by P.E.s & CPAs
18 · CONSTRUCTION

Materials, loads & project math

Concrete, lumber, roofing, paint — skip the back-of-envelope guesswork on your next build.

View all 18 construction calculators →
Concrete Calculator ↗
Estimate the cubic yards, bags, and cost of concrete for slabs, footings, columns, and walls. Includes a 10% waste factor and side-by-side comparison of ready-mix versus bag pricing.
Concrete Slab Calculator ↗
Estimate the concrete volume, rebar grid layout, bar count, weight, and total cost for a reinforced concrete slab. Includes a 10% waste factor for concrete.
Mulch Calculator ↗
Estimate the cubic yards and bags of mulch needed for your landscaping project. Compare bulk delivery versus bagged pricing with a 10% waste factor.
Asphalt Calculator ↗
Estimate the tons of hot-mix asphalt needed for your paving project. Uses standard density of 145 lb/ft³ with a 10% waste factor.
Board Feet Calculator ↗
Calculate the board footage of lumber for your woodworking or construction project. Enter dimensions and quantity to estimate volume and cost.
Flooring Calculator ↗
Estimate the square footage, number of boxes, and cost of flooring for any room. Includes a configurable waste factor for cuts and fitting.
15 · RETIREMENT

Plan the long arc with confidence

Model savings, withdrawals, Social Security and required distributions — free, no signup.

View all 15 retirement calculators →
401(k) Calculator ↗
Project your 401(k) balance at retirement age, factoring in employer match, annual raises, and compound growth. See exactly how much your contributions and match add up over decades.
Roth IRA Calculator ↗
See how your after-tax Roth IRA contributions compound tax-free over time. Includes contribution limits based on age and projected tax-free retirement income.
RMD Calculator ↗
Find your required minimum distribution using the IRS Uniform Lifetime Table. Enter your age (73+) and account balance to see your annual withdrawal requirement and effective rate.
Retirement Planner ↗
Get a retirement readiness score and detailed gap analysis. See how your current savings, expected Social Security, and monthly expenses stack up against a 30-year retirement.
Social Security Calculator ↗
Estimate your monthly Social Security benefit at ages 62, full retirement age (FRA), and 70. Compare claiming strategies and find the break-even age for delaying benefits.
Compound Interest Calculator ↗
Calculate how your money grows with compound interest. Choose monthly, quarterly, or annual compounding and add regular contributions to see the power of compounding over time.
15 · TAX

Estimate what you'll owe — or get back

Federal, state, payroll and capital gains — no signup, no saving of your data.

View all 15 tax calculators →
Take-Home Pay Calculator ↗
Estimate your after-tax income by paycheck. Accounts for 2026 federal brackets, state income tax, Social Security, and Medicare withholding.
IRS Withholding Calculator ↗
Estimate whether your current W-4 withholding will result in a refund or balance due. Get a recommendation for adjusting your W-4.
Self-Employment Tax Calculator ↗
Estimate your self-employment tax (Social Security + Medicare) plus federal income tax. Includes the deductible half of SE tax and quarterly payment amounts.
Quarterly Tax Calculator ↗
Estimate your quarterly estimated tax payments for 2026. Includes safe harbor calculations and IRS due dates to help you avoid underpayment penalties.
Capital Gains Tax Calculator ↗
Estimate your capital gains tax based on purchase price, sale price, holding period, and income. Covers both long-term and short-term rates for 2026.
Paycheck Calculator ↗
See a detailed breakdown of your paycheck — gross pay, federal withholding, state tax, Social Security, and Medicare. Supports both hourly and salaried workers.