Insurance calculator

Free disability insurance calculator

Enter your monthly essential expenses and what you'd still receive — SSDI, employer long-term disability and any other income — to see your monthly disability coverage gap, the income a private policy would need to replace, updated live as you type.

On this page12 sections

InputsLive

Solve for

Savings goal

Current savings

Annual return rate

Target timeframe

yrs

Result

Monthly saving needed

$640.87

To reach $50000 in $5 yrs at 5%

Monthly saving$640.87

Goal$50,000

Timeframe5 years

Return rate5%

Hypothetical projection at fixed rate. Actual savings returns vary. Excludes taxes.

Results are estimates. Consult a professional.

Definition

What a disability insurance calculator shows you

A disability insurance calculator answers one blunt question: if an illness or injury stopped your paycheck, how much monthly income would you be short? Disability insurance replaces a portion of your earnings when you cannot work, and this tool finds the gap between what your household spends each month and what your existing safety net — Social Security disability, an employer long-term disability plan, and any other income — would actually pay. That monthly shortfall is the amount a private disability policy would need to fill.

The gap matters because the risk is not rare. The Social Security Administration estimates that a 20-year-old worker has roughly a 1-in-4 chance of becoming disabled before reaching full retirement age — a far higher probability than dying young, which is what most people insure against first.

Social Security Administration — Disability Benefits: more than 1 in 4 of today's 20-year-olds will become disabled before reaching retirement age.

Method

How the disability insurance gap is calculated

The math is deliberately simple so the answer is hard to argue with: your monthly need is what you must keep paying when you cannot work, and your coverage is every source that would still flow in. The gap is what is left uncovered.

monthly need = monthly essential expenses

existing coverage = other income + SSDI + employer LTD

coverage gap = max(0, monthly need − existing coverage)

Enter monthly essential expenses. Housing, food, utilities, insurance, minimum debt payments and childcare — the bills that do not pause when income does.
Add other monthly income. A spouse's pay, rental income or anything that would continue even while you are disabled.
Estimate the SSDI benefit. Social Security Disability Insurance pays only if your condition is severe and long-lasting; many private claims pay long before SSDI ever approves.
Add the employer LTD benefit. Group long-term disability typically replaces 50–60% of base salary, and benefits from an employer-paid plan are usually taxable.

Worked example

A worked example of the monthly coverage gap

Example: a single earner with group LTD

Your household needs $6,000 a month to cover essentials. You have no other income coming in. You estimate $1,800 a month from SSDI and your employer's long-term disability plan would pay $2,000 a month. What would a private policy need to cover?

Step 1 — Total your existing coverage

Add the three income sources: $0 other + $1,800 SSDI + $2,000 employer LTD = $3,800 a month.

Step 2 — Subtract coverage from need

Your monthly need is $6,000. The gap is $6,000 − $3,800 = $2,200 a month — the income a disability policy would have to replace.

$2,200/mo coverage gap

Even with SSDI and a generous group LTD plan, this household would fall $2,200 short every month. Over a two-year disability that is more than $52,000 of unmet expenses — the case for a supplemental individual policy.

Quick reference

Sources of disability income, side by side

Not all disability coverage behaves the same way. The table below shows how the three common sources differ on what they replace, how they are taxed, and how easy they are to qualify for.

Source	Typical replacement	Taxable?	Notes
SSDI (Social Security)	Based on work record (avg ~$1,500–$1,600/mo)	Sometimes	Strict definition; long approval wait; condition must be severe and last 12+ months
Employer group LTD	50–60% of base salary, often capped	Usually yes if employer-paid	Cheap or free, but ends if you leave the job; may exclude bonuses
Individual (private) policy	Up to ~60–70% of income	No, if you pay premiums	Portable; benefits tax-free; fills the gap the others leave

Replacement ranges are typical industry figures; SSDI averages per the Social Security Administration. Tax treatment depends on who paid the premium — confirm with IRS guidance or a tax professional.

Social Security Administration — Disability Benefits, how benefits are figured and who qualifies.

Scenarios

Who needs more disability coverage — and who needs less

Single earners with no backup income. With no spouse's paycheck to lean on, the entire essential budget rests on one income — the gap is usually largest here.
High earners with capped group plans. Group LTD often caps the monthly benefit, so the more you earn, the smaller the percentage it actually replaces.
Self-employed and gig workers. No employer LTD at all and an uncertain SSDI record — private coverage is often the only meaningful source.
Those with strong savings or a second income may need less. A large emergency fund or a spouse who out-earns the household budget can shrink the gap toward zero.

The Council for Disability Awareness notes that most long-term disability claims come from ordinary illnesses — cancer, musculoskeletal and cardiovascular conditions, and pregnancy complications — not dramatic accidents. Plan for the common cause, not the rare one.

Gotchas

Common mistakes when estimating the gap

Counting on SSDI as a sure thing. Most initial SSDI applications are denied, and the legal definition of disability is strict. Treat it as a possible floor, not a guaranteed benefit.
Ignoring tax on group LTD. If your employer pays the premium, the benefit is usually taxable — a $2,000 stated benefit can be noticeably less in your pocket.
Forgetting the elimination period. Most policies wait 90 days (sometimes longer) before paying anything. The gap calculator sizes the monthly shortfall; your emergency fund has to bridge the waiting period.
Using gross pay instead of expenses. The need is what you must spend, not what you earn. Budgeting from essential expenses keeps the estimate honest.

Definitions

Disability insurance terms, defined

The monthly income shortfall after subtracting all existing disability coverage from your essential expenses. The number this calculator returns.

Social Security Disability Insurance — a federal benefit for workers who can no longer do substantial work because of a severe, long-lasting condition.

Group coverage, usually through an employer, that replaces part of your salary after a waiting period if you cannot work.

The waiting period — often 90 days — between becoming disabled and when benefits begin to pay.

A policy that pays if you cannot perform your specific occupation, even if you could do some other job. Broader (and pricier) than 'any-occupation' coverage.

How long a policy keeps paying — a set number of years, or until retirement age.

Accuracy

How accurate is this disability estimate?

The arithmetic is exact, but it is only as good as your inputs. The real SSDI figure depends on your earnings record and approval, group LTD depends on your plan's definition and caps, and tax treatment depends on who pays the premium. The result is a planning estimate of your monthly coverage gap, not a quote or a guarantee of benefits.

Treat the number as a starting point for a conversation — not financial or insurance advice. Confirm your likely SSDI benefit with the Social Security Administration and your group LTD terms with your HR department or plan documents before deciding how much private coverage to buy.

Social Security Administration — Disability Benefits.Social Security Administration — Benefits Planner: Disability, how SSDI eligibility and amounts are determined.

Questions

Frequently asked questions about the free disability insurance calculator

A disability insurance calculator is a free online tool that helps you calculate the monthly disability insurance gap based on expenses and existing coverage. If you become disabled, can your existing coverage (SSDI + employer LTD) cover monthly expenses? It runs entirely in your browser with instant results and no sign-up.

Group long-term disability plans typically replace 50–60% of base salary, often with a monthly cap. Individual policies can go up to roughly 60–70% of income. This calculator instead sizes the gap left after your existing coverage, so you can see how much more you'd need.

Yes — enter your estimated SSDI benefit as one of your coverage sources. But treat it cautiously: most initial Social Security disability claims are denied and the eligibility definition is strict, so it may pay less or later than you expect.

It depends on who paid the premium. Employer-paid group LTD benefits are usually taxable; benefits from an individual policy you paid for with after-tax dollars are generally tax-free. Factor tax into your real monthly need.

It's the waiting period — commonly 90 days — between becoming disabled and when benefits start. This calculator sizes the monthly shortfall; your emergency fund has to bridge that initial waiting period.

About

About this Disability insurance calculator

This disability insurance calculator runs entirely in your browser — the expenses and benefit figures you enter are never stored or sent anywhere. It subtracts your existing coverage (other income + SSDI + employer long-term disability) from your monthly essential expenses and recomputes the monthly coverage gap the instant you change a field. It is a planning estimate, not financial or insurance advice or a guarantee of benefits.

It is one of our free insurance calculators — size your survivors' need with the life insurance calculator, or browse the complete calculators directory.