Mileage Calculator
Estimate a mileage reimbursement or tax deduction using the standard per-mile rate for your trip type.
Mileage Calculator: How to Work Out Your Driving Costs and Tax Deduction
Quick summary: A mileage calculator multiplies the number of miles you drive for business, medical, or charitable purposes by the official government reimbursement rate to work out your tax deduction or expense claim. In the US the 2026 IRS business rate is 72.5 cents per mile, while in the UK HMRC pays 45p per mile for the first 10,000 business miles and 25p per mile after that.
If you drive for work, freelance, volunteer, or run a small business, a mileage calculator takes the guesswork out of one of the most common — and most audited — expense categories. Instead of manually multiplying trip distances by a rate you have to look up every year, a mileage calculator does the math instantly and helps you avoid under- or over-claiming, both of which can create problems with tax authorities. This guide breaks down exactly how a mileage calculator works, the current 2026 rates in the US and UK, and worked examples you can follow with your own numbers.
What Is a Mileage Calculator and Why It Matters
A mileage calculator is a tool that converts driving distance into a dollar or pound value, based on the standard mileage rate set by a tax authority — the IRS in the United States, or HMRC in the United Kingdom. Rather than tracking actual vehicle costs (fuel, depreciation, insurance, maintenance), most self-employed people and employees use the standard mileage method because it’s simpler and, in many cases, more generous.
A mileage calculator is especially useful for:
- Self-employed workers and freelancers claiming vehicle expenses on a tax return
- Employees who use a personal car for work and get reimbursed by an employer
- Small business owners tracking deductible travel
- Rideshare and delivery drivers estimating per-mile profitability
- Anyone comparing the cost of driving vs. flying or taking public transport
The Mileage Calculator Formula
The formula behind every mileage calculator is straightforward:
Reimbursement or Deduction = Miles Driven × Mileage Rate
The complexity comes from the rate itself, which changes annually and depends on your country, the purpose of the trip, and — in the UK — how many business miles you’ve already driven that tax year.
2026 IRS Standard Mileage Rates (United States)
According to the IRS’s official December 2025 announcement, the 2026 standard mileage rates are:
- 72.5 cents per mile for business use — up 2.5 cents from 70 cents in 2025 (irs.gov)
- 20.5 cents per mile for medical purposes — down half a cent from 2025 (irs.gov)
- 20.5 cents per mile for active-duty Armed Forces moving purposes (irs.gov)
- 14 cents per mile for charitable purposes — unchanged from 2025, since this rate is fixed by statute rather than an annual cost study (irs.gov)
The IRS notes that the business rate is based on an annual study of the fixed and variable costs of operating a vehicle, while the medical and moving rates reflect variable costs only. Use of the standard mileage rate is optional — taxpayers can instead calculate and deduct their actual vehicle expenses (irs.gov).
2025–26 HMRC Mileage Rates (United Kingdom)
For UK employees and self-employed workers, HMRC’s Approved Mileage Allowance Payments (AMAP) rates are structured in tiers:
| Vehicle type | First 10,000 business miles | Miles after 10,000 |
|---|---|---|
| Cars and vans | 45p per mile | 25p per mile |
| Motorcycles | 24p per mile | 24p per mile |
| Bicycles | 20p per mile | 20p per mile |
If an employee carries a colleague on a business trip in their own car or van, HMRC also allows a tax-free passenger payment of 5p per mile (gov.uk; haringey.gov.uk council mileage guidance).
Worked Examples
Example 1: US freelancer, business mileage deduction
A freelance consultant drives 4,200 business miles in 2026.
Calculation: 4,200 miles × $0.725 = $3,045.00 deduction
Example 2: UK employee, under the 10,000-mile threshold
An employee drives 6,500 business miles in a tax year using their own car.
Calculation: 6,500 miles × £0.45 = £2,925.00 tax-free reimbursement
Example 3: UK employee, over the 10,000-mile threshold
A field sales rep drives 13,000 business miles in a tax year.
Calculation (tiered):
- First 10,000 miles: 10,000 × £0.45 = £4,500
- Remaining 3,000 miles: 3,000 × £0.25 = £750
- Total: £5,250.00
This tiered structure is the most common point of confusion for UK mileage calculators — the rate isn’t flat once you pass 10,000 miles, only the miles above the threshold drop to 25p.
Example 4: US medical mileage
A taxpayer drives 800 miles to medical appointments in 2026.
Calculation: 800 miles × $0.205 = $164.00 deductible
Standard Mileage Rate vs. Actual Expense Method
A mileage calculator using the standard rate is faster, but it isn’t always the better financial choice. Here’s the trade-off:
- Standard mileage rate: simpler recordkeeping (just log miles and trip purpose), no need to save every fuel and repair receipt, generally favored for lower-cost, high-mileage vehicles.
- Actual expense method: requires tracking fuel, insurance, repairs, depreciation, and registration, and calculating the business-use percentage — often better for expensive vehicles or those with high running costs.
You generally have to choose one method consistently for a given vehicle (rules differ by country and by whether the vehicle is leased or owned), so it’s worth running the numbers both ways in your first year.
Common Mileage Calculator Questions
Does commuting count as business mileage? No. Ordinary commuting from home to a regular workplace generally does not qualify as business mileage under either IRS or HMRC rules — the deduction applies to travel beyond your normal commute, such as visiting clients, traveling between job sites, or business trips.
Do I need to log every trip? Yes. Both the IRS and HMRC expect a contemporaneous mileage log showing the date, purpose, destination, and distance of each trip. A mileage calculator only tells you the value of the claim — it doesn’t replace the underlying record.
Can I claim mileage and fuel costs at the same time? Generally no, if you’re using the standard mileage rate — it’s designed to already cover fuel, depreciation, and maintenance combined. Claiming actual fuel costs on top of the standard rate typically isn’t permitted.
Why did the mileage rate go up in 2026? The IRS ties its business mileage rate to an annual study of vehicle operating costs and inflation adjustments, which is why the rate increased from 70 cents to 72.5 cents per mile for 2026.
FAQs
The 2026 IRS standard mileage rate for business use is 72.5 cents per mile, up from 70 cents in 2025.
HMRC’s Approved Mileage Allowance Payment rate is 45p per mile for the first 10,000 business miles in a tax year, dropping to 25p per mile after that.
If your employer reimburses you at or below the official standard rate, that reimbursement is generally not taxable. Amounts paid above the approved rate may be treated as taxable benefit.
Use a mileage calculator separately for each category — business, medical, moving, and charitable mileage each use a different rate, so they shouldn’t be combined into one total.
Yes — many gig-economy drivers use the standard mileage rate to estimate their deductible driving costs, since it’s usually easier to track than actual vehicle expenses.
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Conclusion
Whether you’re an employee claiming reimbursement or self-employed and deducting vehicle costs at tax time, a mileage calculator turns a simple multiplication problem — miles driven × the official rate — into an accurate, defensible number. With the 2026 IRS business rate at 72.5 cents per mile and HMRC’s tiered 45p/25p structure in the UK, using an up-to-date mileage calculator (and keeping a proper trip log to back it up) is the easiest way to make sure you’re claiming exactly what you’re owed, no more and no less.