How is this different from each individual calculator?

Each tool has its own canonical URL (better for sharing and SEO); the bundle page lists all of them with a one-line description so you can land on the right one fast.

Do calculations save anywhere?

By default everything is local to the tab. Sign in to a free account and the workspace-aware calculators sync across devices.

Are these calculators accurate enough for legal/tax purposes?

They're accurate to the formulas they document, but tax, lending, and medical calculations should be confirmed with a professional for binding decisions.

All-in-one

Every calculator in tabbed view

Calculators

All-in-one

Every calculator in tabbed view

Toolenza

Calculator style

Inverse on ·

Result

Age (optional)

Gender (optional)

Date of birth

Bill amount People

Tip percent

Start date End date

Loan amount Interest rate (APR %) Term (years)

Original price Discount

Principal Annual rate (%) Years Compounding

Monthly contribution (optional)

Your courses

Hours per week Weeks worked / yr

ASCII

Home price Down payment (USD) Term (years) APR (%) Property tax (% / yr) Home insurance (USD/yr) PMI rate (% / yr) HOA (USD/mo) Extra principal (USD/mo)

Total monthly

Principal & interest

Tax / Ins / PMI / HOA

Total interest paid

Saves · Off months

Amortization schedule (yearly summary)

Year	Principal	Interest	Balance

Current loan

Balance (USD) Rate (% APR) Years remaining

New (refi) loan

Rate (% APR) Term (years) Closing costs (USD)

Current monthly

New monthly

Break-even

Lifetime savings (entire new term, after closing costs): — refinancing would cost more.

Vehicle price (USD) Down payment (USD) Trade-in value (USD) APR (%) Term (months) Sales tax (%) Doc / fees (USD) Tax on trade-in (some states)

Monthly

Loan amount

Total interest

Total cost

Vehicle price (USD) Term (months) Sales tax (%)

Lease

Residual (%) Money factor (× 2400 = APR) Down / cap reduction (USD) Acquisition fee (USD)

Monthly:

Total over months:

Buy (with loan)

Down payment (USD) APR (%) Loan term (months) Resale value at end (USD)

Monthly (during loan):

Net cost over months:

Over months is cheaper by

Initial (USD) Monthly contribution (USD) Annual return (%) Years

Future value

Total contributed

Earned interest

Year-by-year

Year	Contributed	Earned	Balance

Current age Retire at Current salary (USD) Salary growth (%/yr) Your contribution (%) Employer match (% of salary) Current balance (USD) Annual return (%)

At retirement

Age

Total contributed (you + employer)

Withdrawal at 4% rule

/yr

/mo

Initial investment (USD) Final value (USD) Holding period (years)

Total ROI

Annualized (CAGR)

Profit / Loss

Amount (USD) From year To year Avg inflation (%/yr)

Equivalent value

in ≈

% increase over years

Average inflation rates over long periods are roughly 3% (US), 2% (Eurozone). Update the rate to match the actual data for your region or period.

Generic estimator — applies a single flat tax rate plus the deductions you specify. Not a country/state tax engine. For exact figures, consult a tax professional.

Gross salary (USD) Period Hours / week Effective tax rate (%) Pre-tax (401k, HSA, etc.) % Post-tax deductions (USD/yr)

Take-home / yr

Take-home / mo

Biweekly

Weekly

Annual gross

− Pre-tax deductions

Taxable income

− Income tax

− Post-tax deductions

= Net annual

Daily pageviews

RPM = revenue per 1,000 pageviews (what your ad network reports). CPM = revenue per 1,000 ad impressions — use Detailed mode if you know your CPM, ads per page and fill rate separately.

6 options

Targeting — the two cycle options closest to that are flagged below as Ideal. The other four are useful for power naps or emergency short sleeps.

— shorter sleep · power naps

Your sleep

light → deep → repeat

bed wake

Light · REM Deep

Sleep happens in roughly 90-minute cycles. Waking at the end of a cycle (rather than mid-cycle) helps you feel rested. Tap Add to calendar on an Ideal time to download an .ics reminder with a 0-minute alarm.

About this tool

The Toolenza calculator suite bundles twenty-three of the most-used calculators into one page: basic four-function, percentage (three modes), BMI with a visual scale, age with a live countdown, tip and bill split, days between dates, fixed-rate loan, percent-off discount, compound interest with growth chart, weighted GPA, salary↔hourly conversion, developer/programmer (hex/dec/oct/bin + bitwise), plus the full finance set — mortgage with PMI and amortization, refinance break-even, auto loan with sales tax and trade-in, lease vs buy, investment with monthly contributions, 401(k) projection with employer match, ROI / annualized return, inflation buying-power, a take-home paycheck estimator, a web ad-revenue estimator, and a 90-minute-cycle sleep planner. Each tab keeps its own state, and each calculator also has its own dedicated page for direct linking.

Frequently asked questions

Yes — every calculator on Toolenza is free, runs in your browser, and works without an account.

No. Calculations run entirely in your browser. Nothing is sent to a server, so your inputs stay on your device.

Once the page has loaded, the calculators continue to work without an internet connection.

Yes — each calculator also has its own dedicated page (e.g. /tools/age-calculator) for fast direct access and bookmarking.

Most calculators sync their state to the URL so a Share button (and a refresh) preserves the inputs. The URL is your bookmark.

Related tools

Basic Calculator

Free online basic arithmetic calculator

Percentage Calculator

% of a value, what % is X of Y, % change

BMI Calculator

Body Mass Index — metric & imperial

Age Calculator

Exact age + countdown to next birthday

Tip Calculator

Bill split + tip per person

Days Between Dates

Exact days, weeks, months between two dates

Loan Calculator

Monthly payment, total interest, schedule

Discount Calculator

Sale price, % off, savings

Compound Interest

Future value with compounding

GPA Calculator

Weighted GPA from your courses

Salary to Hourly

Convert salary to hourly rate

Developer Calculator

Hex, dec, oct, bin + bitwise ops

Mortgage Calculator

Monthly payment + amortization with PMI / tax / insurance

Refinance Calculator

Should you refinance? Break-even analysis

Auto Loan Calculator

Car payment with sales tax + trade-in

Lease vs Buy

Compare leasing a car to buying it

Investment Calculator

Compound investment with monthly contributions

401(k) / Retirement

Project retirement balance with employer match

ROI Calculator

Return on investment + annualized

Inflation Calculator

How buying power changes over time

Paycheck Calculator

Take-home pay estimator

Web Ad Revenue

Estimate display-ad revenue from CPM & traffic

Sleep Calculator

Bedtime / wake-up times around 90-minute cycles

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Drop a one-line iframe snippet into any blog, lesson plan, or knowledge base. Powered-by-Toolenza link included.

Embed this tool

Paste this snippet into any HTML page. The tool runs entirely in your reader's browser.

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