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Personal finance workspace

See the whole plan, not just the answer.

Model cash flow, debt, savings, retirement, and protection with the assumptions and detail kept in view.

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Free No account Transparent calculations

Emergency Fund Reserve targetDebt Payoff Payoff schedule

Example financial plan

Illustrative data — not your information

Example

Monthly surplus

$2,050

Income

$6,800

Expenses

$4,750

Savings rate

Positive cash flow

30.1%

Expense structure

Total $4,750
Housing
$1,850
Essentials
$980
Lifestyle
$720
Debt
$650
Goals
$550
Six-month cash flow
Income / expenses

Emergency fund

40%
$7,200 current$18,000 target

Debt payoff

Avalanche

Projected finish

Apr 2028

22 months

Goal navigator

What do you need to work on?

Choose a financial task to reveal the tools and outputs built for it.

Financial tool index

Start with a baseline. Move into the decision.

All 10 tools, arranged by the financial question each one resolves.

Financial baseline

2 starting tools

01 / START

Monthly Budget Calculator

Build a detailed household budget and see surplus, shortfall, and allocation against custom targets.

  • Monthly breakdown
  • Cash-flow summary
Open calculator

02 / START

Net Worth & Projection Calculator

Calculate assets minus liabilities, then model growth, debt payments, and purchasing power.

  • Asset and liability breakdown
  • Scenario projections
Open calculator

01

Debt and stability

02

Savings and major goals

03

Retirement and financial independence

04

Protection

Product workflow · Debt Payoff

More than a final number.

One submitted snapshot moves through strategy comparison into a payment schedule you can inspect.

Submitted inputs

01
Credit card$4,200 · 22.9%
Auto loan$16,600 · 14.9%
Student loan$8,900 · 8.4%

Monthly debt budget

$1,100

Strategy summary

02

Recommended by selected order

Avalanche

Payoff time

31 months

Total interest

$3,960

Avalanche$3,96031 mo
Snowball$4,24032 mo
Custom order$4,11031 mo

Breakdown + schedule

03
Balance trajectory
$29,700$0 · Month 31
Monthly payoff schedule
MonthPaymentInterestBalance
Aug 2026$1,100$349$28,949
Sep 2026$1,100$344$28,193
Oct 2026$1,100$339$27,432

28 more calculated rows in the full result.

Illustrative interface preview. The live calculator derives results from submitted balances, rates, minimums, budget, and selected payoff order.

Planning timeline

One system for the financial path ahead.

Start where the pressure is now; move forward as the plan changes.

  1. 01

    Now

    See cash flow and the balance sheet today.

  2. 02

    Stabilize

    Create a reserve and a deliberate debt plan.

  3. 03

    Build

    Fund savings and education goals over time.

  4. 04

    Long term

    Test retirement and financial independence.

  5. 05

    Protect

    Plan for a household income-loss scenario.

Practical guides

Understand the decision behind the number.

Browse all 30 guides

Calculation methodology

The arithmetic stays visible.

Visible assumptions
Rates, dates, inflation, fees, and timing stay attached to the result.
Transparent formulas
Key mechanics and model limits are explained on each calculator page.
Detailed results
Summary metrics connect to breakdowns, charts, projections, and schedules.
Educational, not financial advice
Outputs are planning estimates, not personalized recommendations.
Privacy-conscious calculation
Calculator inputs and results stay in temporary page state and are not submitted to a PlanArith backend.

Structured calculation flow

Monthly Budget example

Inputs

$6,800 income

Formula

$6,800 − $4,750

Result

$2,050 surplus

Assumption

Monthly snapshot

Breakdown

5 expense groups

Status

Positive cash flow

Results are deterministic estimates from the submitted snapshot. They do not account for every market, tax, legal, product, or household factor.

FAQ

Before you calculate

Straight answers about inputs, results, privacy, and scope.

Are PlanArith calculators free to use?

Yes. Every calculator currently available on PlanArith is free to use.

Do I need to create an account?

No. You can run every calculation without registration or an account.

Does PlanArith save the information I enter?

No. Inputs remain in the current page state and are not saved to an account. Reloading or resetting clears the current work.

Are the results financial advice?

No. PlanArith provides educational estimates, not individualized financial, investment, tax, insurance, or legal advice.

Why might a result differ from a bank or adviser?

Actual products can use different compounding, payment timing, fees, tax treatment, underwriting, or rates. Each calculator shows the assumptions used for its estimate.

Which calculator should I start with?

Use Monthly Budget for cash flow or Net Worth for a balance-sheet baseline. The goal navigator can point you to a more specific tool.

Can I compare different scenarios?

Yes. Change the inputs and calculate again. Tools with built-in scenarios present those comparisons alongside the submitted result.

Your next calculation

Put one financial question into a complete planning view.

Budget · Debt · Savings · Retirement · Protection

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