Dark Lighthouse Solutions

Free money calculators

Quick, private calculators for the money questions people search most. No sign-up, no email, and nothing you type leaves your browser.

Debt Payoff Calculator

Compare snowball vs avalanche: debt-free date, total interest, payoff order and a month-by-month table.

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Wedding Budget Calculator

Split your total by category, see cost per guest and preview when deposits are usually due.

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Sinking Funds Calculator

See how much to save each month and per paycheck for every goal, with a total.

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Grocery Budget Calculator

Weekly and monthly grocery budget for your household at four USDA price levels, and where your spending sits.

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Moving Cost Calculator

Total moving budget, a date-by-date timeline of when each cost hits, and a weekly amount to save.

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Budget by Paycheck Calculator

See which paycheck pays each bill, what's left from every check, and how to fix a short one.

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Renewal Radar (browser extension)

Tracks your subscriptions and free trials and reminds you before each charge. Free for up to 10 items, and private.

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Want it to keep going?

Each calculator gives you a plan once. If you'd like it to update as you go, the money templates do the same math in Google Sheets and track your progress month after month.